Mussel adhesive protein as an environmentally-friendly harmless wood furniture adhesive

Song, Young Hoon,Seo, Jeong Hyun,Choi, Yoo Seong,Kim, Do Hyung,Choi, Bong-Hyuk,Cha, Hyung Joon Butterworth-Heinemann Ltd. 2016 International journal of adhesion & adhesives Vol.70 No.-

<P><B>Abstract</B></P> <P>Recent adhesive technologies have focused on the development of high-quality and eco-friendly adhesives. Thus, there is a gradual shift from the currently used chemical-based adhesives toward harmless adhesives with improved quality and performance. Here, we evaluated the potential use of bacteria-produced recombinant mussel adhesive protein (MAP) as a harmless wood furniture adhesive. We formulated a MAP wood adhesive as an inclusion body type for economical preparation, and we confirmed its harmlessness through the non-detection of volatile organic compounds and heavy metals. The formulated MAP showed sufficiently strong bulk adhesive strength for the dried gluing of wood adherends. We also found that the formulated MAP wood adhesive exhibits robust adhesion in various environmental conditions, including open assembly times, incubation times, temperatures, and humidity levels. In summary, the developed recombinant MAP could be successfully used as a promising environmentally-friendly, harmless wood furniture adhesive.</P>

Drying time of tray adhesive for adequate tensile bond strength between polyvinylsiloxane impression and tray resin material

Yi, Myong-Hee,Shim, Joon-Sung,Lee, Keun-Woo,Chung, Moon-Kyu 대한치과보철학회 2009 The Journal of Advanced Prosthodontics Vol.1 No.2

STATEMENT OF PROBLEM. Use of custom tray and tray adhesive is clinically recommended for elastomeric impression material. However there is not clear mention of drying time of tray adhesive in achieving appropriate bonding strength of tray material and impression material. PURPOSE. This study is to investigate an appropriate drying time of tray adhesives by evaluating tensile bonding strength between two types of polyvinylsiloxane impression materials and resin tray, according to various drying time intervals of tray adhesives, and with different manufacturing company combination of impression material and tray adhesive. MATERIAL AND METHODS. Adhesives used in this study were Silfix (Dentsply Caulk, Milford, Del, USA) and VPS Tray Adhesive (3M ESPE, Seefeld, Germany) and impression materials were Aquasil Ultra (monophase regular set, Dentsply Caulk, Milford, Del, USA) and Imprint Ⅱ Gai-ant (regular body, 3M ESPE, Seefeld, Germany). They were used combinations from the same manufacture and exchanged combinations of the two. The drying time was designed to air dry, 5 minutes, 10 minutes, 15 minutes, 20 minutes, and 25 minutes. Total 240 of test specimens were prepared by auto-polymerizing tray material(Instant Tray Mix, Lang, Wheeling, Ⅱ, USA) with 10 specimens in each group. The specimens were placed in the Universal Testing machine(Instron, model 3366, Instron Corp, University avenue, Nowood, MA, USA) to perform the tensile test (cross head speed 5 mm/min). The statistically efficient drying time was evaluated through ANOVA and Scheffe test. All the tests were performed at 95% confidence level. RESULTS. The results revealed that at least 10 minutes is needed for Silfix-Aquasil, and 15 minutes for VPS Tray Adhesive-lmprint Ⅱ, to attain an appropriate tensile bonding strength. VPS Tray Adhesive-lmprint II had a superior tensile bonding strength when compared to Silfix-Aquasil over 15 minutes. Silfix-Aquasil had a superior bonding strength to VPS Tray Adhesive-Aquasil, and VPS Tray Adhesive-lmprint Ⅱ had a superior tensile bonding strength to Silfix-lmprint Ⅱ at all drying periods. CONCLUSION. Significant increase in tensile bonding strength with Silfix-Aquasil and VPS Tray adhesive-Imprint Ⅱ combination until 10 and 15 minutes respectively. Tray adhesive-impression material combination from the same company presented higher tensile bonding strength at all drying time intervals than when using tray adhesive-impression material of different manufactures.

Manufacture of Polyurethane Foam Dressing Applied with Silicone/Acrylate Adhesive and Evaluation of its Properties

( Hyun Jung Kim ),( Il Kyu Park ),( Kab Keun Kim ),( Seung Moon Lee ),( Jae Ho Kim ),( Moon Suk Kim ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.6

This study aims to develop an adhesive polyurethane foam wound dressing having high absorption capacity, which can be applied to high-exudate wounds, by using a silicone adhesive. The adhesive wound dressing applied with a silicone/acrylic adhesive to impart adhesion to the polyurethane foam contains pores in the adhesive surface, and thus is advantageous for the absorption of exudates. It could be seen that the adhesive wound dressing exhibited excellent absorption and retention capacities regardless of the content of the silicone/acrylic adhesive. With respect to adhesion, in the case of the adhesive wound dressing applied only with silicone, the adhesive layer was easily separated from the foam layer, whereas in the case of the wound dressing applied with a silicone/acrylic adhesive, the adhesive layer was not easily separated from the foam layer and was easily removed from the part to which the wound dressing has been applied. In conclusion, a polyurethane foam applied with a biocompatible silicone adhesive could be easily manufactured and is expected to be used in various applications.

Preparation of Stick Type Solid Glue as Paper Adhesive Using Mixed Seaweed Extract

Seung-Jun Oh,Won-Sik Han,Koang-Chul Wi 한국문화재보존과학회 2019 보존과학회지 Vol.35 No.4

Seaweed extracts, namely carrageenan obtained from Grateloupia elliptica and algin obtained from Laminaria, were employed as adhesive agents to synthesize solid adhesives for paper. Carrageenan from Grateloupia elliptica with the highest adhesive strength and lgin from Laminaria with the highest compressive strength was selected. The selected carrageenan and algin were mixed in a ratio of 7:3, and the mixture was employed as an adhesive agent. At a high temperature, sodium stearate(used as a solidifying material) oxidized the seaweed extracts. Consequently, carrageenan and algin were added to the final manufacturing process. The adhesive strength of the final synthesized solid adhesive is found to be 3.02 MPa and the compressive strength is found to be 30.5 N. Compared to the adhesive strength (2.95 MPa) and compressive strength (30.11 N) of commercial solid adhesives, the obtained results indicate superior adhesion characteristics. Furthermore, the proposed adhesive is environment-friendly because the presence of volatile organic compounds, formaldehyde, and heavy metals(such as chromium, lead, and cadmium) were not detected. Moreover, when used, the flatness of paper was twice that of commercial solid paper adhesives. Hence, the proposed adhesive can provide excellent adhesion, stability, and usability.

An investigation into the effect of denture adhesives on incisal bite force of complete denture wearers using pressure transducers : A clinical study

Pawan Kalra,Ramesh Nadiger,Farhan Khalid Shah 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.2

PURPOSE Study was conducted to determine and assess the effect of different type of denture adhesives on the incisal bite force of complete denture wearers until the dislodgement of upper denture, using pressure transducer. MATERIALS AND METHODS 30 patients out of 100 were included in the study. Based on the Kapur's method of scoring denture retention and stability, these patients were divided into 3 groups- Group A - Clinically good dentures; Group B - Clinically fair dentures; and Group C - Clinically poor dentures. A custom made occlusal force meter was constructed based on the load cell type of pressure transducers. Different adhesives (powder, paste and adhesive strips) were used in the study. Complete denture wearers were asked to bite on the load cell and the readings of incisal bite force were recorded. The readings of incisal bite force were subjected to statistical analysis using Repeated measures ANOVA followed by post-hoc bonferroni test. RESULTS The result suggests that denture adhesives improved the incisal bite force of complete denture wearers significantly The incisal bite force (in kg) in Group A without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 2.48 (± 0.16), 3.43 (± 0.11), 6.01 (± 0.11), 3.22 (± 0.09) respectively. The incisal bite force (in kg) in Group B without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 1.87 (± 0.18), 3.35 (± 0.14), 5.34 (± 0.18), 3.21 (± 0.12) respectively. The incisal bite force (in kg) in Group C without using adhesives, with powder adhesive, with paste adhesive and with adhesive strips was found to be 1.00 (± 0.17), 3.07 (± 0.14), 4.37 (± 0.26), 2.99 (± 0.14) respectively. CONCLUSION Within the limitations of the study, it was concluded that the use of denture adhesive was found to be significantly effective in improving the incisal bite force of complete dentures until the dislodgement of upper denture. Fittydent paste adhesive was found to be more effective than the powder and strips adhesives. The improvement in incisal bite force was found to be higher in Group C in comparison to that of Group A and Group B.

단일겹침 접착제 접합부의 응력분포와 강도평가

이중삼,임재규,김연직 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.3

Recently, adhesive-bonding technique is wifely used in manufacturing structures. Stress and strain analysis of joints are essential to design adhesive-bonded joints structure. The single-lap adhesive joint is the design dominating the range of adhesive joints. In this study, single-lap specimens with different joint dimensions were used for the tensile-shear test and finite element calculation in of order to investigate the effect of overlap length and adhesive-bonding thickness on adhesive strength and stress distribution of the joints. Consequently, it was found that overlap lap size and thickness can be important parameters of structure joints using adhesive bonding, which is effected on adhesive strength.

Innovative Effects on GFRP Inserted Epoxy Adhesives with Different Thicknesses for Bonding in Two-Part Wind Turbine Blades

김종현,권동준,박종만,K. Lawrence DeVries 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11

Adhesion of hybrid composite materials is essential in the manufacture of wind turbine blades. In the case of huge composite structures, however, the adhesive section between hybrid composite (GFRP, CFRP) was too thick, and it could be lead to decrease adhesion peroperty. In this research, adhesive properties were investigated with different adhesive thicknesses for glass fiber and carbon fiber reinforced hybrid composites. As the adhesive thickness increased, the lap shear strength (LSS) decreased in a rather exponential function. In addition, there were problems that as the thickness of the adhesive increases, voids easily formed inside the adhesive, and the thick adhesive layer had low resistance to bending. Even when the thick bonding section was formed with GFRP addition, added GFRP was deformed more in the bonding part upon the applied external stress. This could be because the interfacial stress was greater than that of the neat epoxy adhesive. It was monitored by 3D electrical resistance (ER) mapping of the CFRP substrate was used to evaluate the shear stress transfer of the bonding part and the CFRP substrate. The addition of GFRP to the epoxy adhesive can improve the adhesion and the resistance to shear failure for thick adhesive parts, such as wind turbine blades (WTB).

Adhesion of bioinspired nanocomposite microstructure at high temperatures

Seong, Minho,Jeong, Changyoon,Yi, Hoon,Park, Hyun-Ha,Bae, Won-Gyu,Park, Young-Bin,Jeong, Hoon Eui Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.413 No.-

<P><B>Abstract</B></P> <P>Bioinspired dry adhesives with protruding tips offer strong, repeatable, and reversible adhesion both in normal and shear directions owing to the presence of a thin spatulate layer. However, the temperature range in which they can be used is limited because most of them are made of polymeric materials that have inherently poor thermomechanical stability. Here, we report a nanocomposite dry adhesive as a high-temperature reversible adhesive with high pull-off strength. The nanocomposite dry adhesive is fabricated by a replica-molding technique with polydimethylsiloxane (PDMS) enforced with multiwalled carbon nanotubes (MWCNTs) of different concentrations. The MWCNT/PDMS composite adhesives exhibit remarkably better thermal stability than pristine PDMS adhesives owing to the excellent thermal and mechanical properties of the MWCNTs in the composite. Furthermore, the nanocomposite adhesives have a high adhesion strength even when they are thermally annealed at high temperatures of up to 350°C, demonstrating a strong potential as a versatile high-temperature reversible adhesive.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polydimethylsiloxane (PDMS) enforced with multiwalled carbon nanotubes (MWCNTs) is utilized to fabricate bioinspired dry adhesives. </LI> <LI> The nanocomposite adhesive exhibits a high adhesion strength even when they are thermally annealed at high temperatures. </LI> <LI> The nanocomposite adhesive shows notably enhanced thermomechanical stability. </LI> <LI> This soft nanocomposite dry adhesive can serve as a versatile high-temperature, reversible, contamination-free adhesive for a broad range of applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of Joint Reformation on Adhesive Strength of 6061 Aluminum Alloy to Polycarbonate Lap Structures

D. W. Seo,Kim, H. J.,J. K. Lim The Korean Welding and Joining Society 2004 International journal of Korean welding society Vol.4 No.1

Adhesive-bonded joints are widely used in the industry. Recently, applications of adhesive bonding joints have been increased extensively in automobile and aircraft industry. The strength of adhesive joints is influenced by the surface roughness, adhesive shape, stress distribution, and etc. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this study, as the fundamental research of adhesive bonding joints, the effects of adhesive shape and loading speed on bonding strength properties and durability of aluminum to polycarbonate single-lap joints were studied. To evaluate the effect of adhesive shape, several modified shapes were used, and loading speeds were varied from 0.05 to 5mm/min. As a result, the load distribution showed a brittle fracture tendency. The trigonal edged single lap and bevelled lap joints showed the higher strength than the plain single lap, trigonal single lap, joggle lap and double lap joints in same adhesive area. The fractures of trigonal single lap and trigonal edged single lap joints that had the higher strength level were shown as the mixture type of the cohesive and interfacial-failure, mostly joggle lap joints that had the lower strength level were shown as the adhesive-failure.

THE EFFECT OF SEALING PROCEDURE USING ALL-IN-ONE ADHESIVE ON MICROLEAKAGE OF PIT AND FISSURE SEALANT

Yoon, Hee-Hun,Lee, Jae-Cheon,Kim, Jung-Wook,Kim, Chong-Chul,Hahn, Se-Hyun,Lee, Sang-Hoon 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.3

본 연구는 all-in-one adhesive를 사용하여 전색하는 술식을 통상적인 탈회 술식 및 single-bottle 결합제를 이용하여 전색하는 술식과 비교하여 법랑질과 전색재 사이의 미세누출의 차이를 알아보고자 하는 것이다. 75개의 제3대구치를 5군으로 나누어 1군을 대조군으로 하여 only Etching(1군), Adper<TEX>$$\^(TM)$$</TEX> Single Bond<TEX>$$\^(TM)$$</TEX>(2군) , Adper<TEX>$$\^(TM)$$</TEX> Prompt<TEX>$$\^(TM)$$</TEX> L-Pop(3군), AQ-bond(4군), One-up bond F(5군)로 처리한 후 전색재 도포 후 열순환을 시행한 뒤 미세누출도를 검사하여 다음과 같은 결론을 얻었다. 1. All-in-one adhesive를 사용한 3, 4, 5군은 1군에 비해 유의성있게 높은 평균미세누출도를 보였다(p<0.05). 2. 가장 낮은 평균미세누출도는 2군(0.14)에서 보였고 1군(1.05), 3군(1.65), 4군(2.85), 5군(3.05) 순으로 증가하였다. 3. All-in-one adhesive를 사용한 3, 4, 5군중에서 3군은 4, 5군에 비해 통계적으로 유의성있게 낮은 평균미세누출도를 보여주었지만(p<0.05) 1군과 2군에 비해 유의성있게 높은 평균값을 보여주었다(p(0<.05). 4. 4군과 5군 사이의 평균미세누출도는 통계적으로 유의성있는 차이를 보이지 않았다(p>0.05). 5. 주사전자현미경관찰결과 all-in-one adhesive를 사용한 3, 4, 5군은 1, 2군에 비해 레진돌기가 짧고 불규칙하게 관찰되었다. The purpose of this study was to examine differences in microleakage of enamel-sealant interface when all-in-one adhesives were used compared with conventional acid etching and single-bottle adhesive system. Seventy-five extracted permanent third molars were randomly divided into 5 groups and treated with only Etching, Adper<TEX>$$\^(TM)$$</TEX> Single Bond<TEX>$$\^(TM)$$</TEX>, Adper<TEX>$$\^(TM)$$</TEX> Prompt<TEX>$$\^(TM)$$</TEX> L-Pop, AQ-bond and One-up Bond F each. After sealant application, the samples were thermocycled and the degree of microleakage was determined. The results were as follows : 1. Group 3, 4, 5 using the all-in-one adhesive system showed significantly higher microleakage score than Group 1(p<0.05). 2. The lowest mean microleakage score was Group 2(0.41) followed by Group 1 (1.05), Group 3(1.65), Group 4(2.85) and group 5(3.05). 3. Among Groups using all-in-one adhesives, Group 3 showed significantly lower mean microleakage score than the other groups(p<0.05) but showed significantly higher mean score than both Group 1and Group 2(p<0.05). 4. There was no statistically significant difference(p>0.05) between Group 4 and Group 5. 5. In SEM examination, all the groups used all-in-one adhesive showed shorter resin tags than Group 1.