Fabrication of a Biodegradable Multi-layered Polyvinyl Alcohol Stent

Mei-Chen Lin,Ching-Wen Lou,Jan-Yi Lin,Ting An Lin,Yueh-Sheng Chen,Jia-Horng Lin 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8

This study aims to develop biodegradable vascular stents that prevent permanent damage caused by rejection of the immune system of the human body. Polyvinyl alcohol (PVA) yarns are twisted to enhance their strength. The twisted yarns are braided and then coated with chitosan (CS). The CS-coated PVA vascular stents are chemically crosslinked with genipin (GP) to improve their flexibility and biodegradability. Their morphological characteristics are also observed using a stereoscopic microscope, and their properties are evaluated through scanning electron microscopy, Fourier transform infrared, bending test, biodegradability test, drug release measurement, and MTT assay. Results reveal that wet PVA-CS-GP vascular stents coated with multiple CS layers can maintain a tubular structure when they are bent. After crosslinking is performed, the compressive strength of the PVA-CS-GP stents is 17.04 times higher than that of pure PVA. The weight loss rate of the PVA-CS-GP vascular stents as <3 % after 30 days. The PVA-CS-GP vascular stents composed of 0.10 % heparin sodium show a good drug release effect. Biological activity test indicates that these stents exhibit good proliferation, and our structural model verifies that they are good vascular stents.

Polyester/Polylactic Acid/Stainless Steel Composite Bone Scaffolds Made by Electrochemical Treatment: Process Design and Property Evaluations

Mei-Chen Lin,Ching-Wen Lou,Jan-Yi Lin,Ting An Lin,Shih-Peng Wen,Jia-Horng Lin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2

This study combines and twists 75D polyester (PET) multi-filaments and polylactic acid (PLA) multi-filaments with twist coefficients of 2, 3, 4, 5, and 6 to form 150D PET/PLA plied yarns. The 0.08-mm-diameter stainless steel (SS) fibers are made into SS braids with a 60-tooth braid gear and a take-up gear with 60, 70, 80, 90, or 100 teeth. PET/PLA plied yarn and SS braids are then combined and electrochemically treated with an electric current of 100, 200, 300, 400, or 500 mA at 60 ℃ for 24 hours, forming the PET/PLA/SS composite bone scaffolds. PET/PLA/SS composite bone scaffolds are observed by scanning electron microscope (SEM) and energy dispersive spectroscope (EDS), and tested for weight increase rate and biocompatibility. The experiment results show that the optimal twist coefficient for PET/PLA plied yarn is 4 and the optimal tooth number on the take-up gear for SS braids is 80. SEM observation result shows that hydroxyapatite (HA) deposits on the surface of PET/PLA/SS composite bone scaffolds and attaches to the PET/PLA plied yarns. Finally, regardless of electric currents, all PET/PLA/SS composite bone scaffolds possess good biocompatibility.

Structural Design and Property Evaluations of Foam-based Composite Materials: Effect of Perforation Depth and Foam Density on the Mechanical, Sound Absorption, and Thermal Properties

Ruei-Ren Ou,Chen-Hung Huang,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3

Nonwoven fabrics and rigid polyurethane foam(PUF) are commonly used materials as building materials, butthere are few studies on combining both materials and reporting characteristic evaluations for the application. In this study, N/L/Fr nonwoven fabrics are combined with PUF to produce N/PUF composites, and then a needle punching machine is usedfor perforation, thereby produces perforated N/PUF composites. With PUF densities being 70 kg/m3 and 80 kg/m3, aperforation depth of 100 % results in significantly decreasing mechanical properties. Based on the results of thermalconductivity coefficient, the employment of needle punch process results in a decrease in the thermal insulation of N/PUFcomposite; however, the descending level is comparatively smaller when PUF is made of a greater density. In thethermogravimetric analysis (TGA), the char residue is 4.86 % for PUF and 11.68 % for N/PUF composites, indicating thatN/L/Fr nonwoven fabrics improve the thermal stability of PUF. As per limiting oxygen index (LOI), the part of proposed N/PUF composites that first contacts the flame is N/L/Fr nonwoven fabrics, which causes an LOI of 33 when in practicalapplication and resembles the LOI (33) of N/L/Fr nonwoven fabrics. Based on the test results, the optimal perforated N/PUFcomposites are made of a PUF density of 80 kg/m3 and a perforation depth of 75 %, and the optimal compression strength is375.29 kPa, which increases by 10.96 %. In addition, the proposed products have the same impact absorption capacity (5.88 J) asthat of N/PUF composites, which absorb a total of 98.16 % impact energy. The sound absorption is improved in the frequencyband of 800-2500 Hz, which broadens the sound absorption bandwidth and benefits the application as being sound absorbentmaterials.

Hybrid-Fiber-Reinforced Composite Boards Made of Recycled Aramid Fibers: Preparation and Puncture Properties

Yu-Chun Chuang,Limin Bao,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2

Protective textiles require massive consumption of fibers and fabrics, which is responsible for diverse highstrength fabric waste. Wrongly arranged disposal of textile waste is equivalent to the waste valuable resource while causing environmental pollutions. Aramid selvages are worthwhile recycling and used in this study. They are scattered into Aramidstaple fibers and mixed with low melting point polyester (LMPET) fibers to form the Aramid matrices employing the nonwoven process. The matrices are added to different combinations to form Aramid composite matrices and hybrid-fiberreinforced composite boards. The process of shearing, crowding, and friction helps improve the mechanical properties of the composite boards according to the evaluations of conducted tests. With the premise of minimum damage to the fibers, this study uses recycled Aramid waste to produce composite boards that have features of high performance and low productioncost. As a test result, the hybrid-fiber-reinforced composite boards with 90 wt% of recycled Aramid fibers have the optimal mechanical property and static puncture resistance.

Multi-walled Carbon Nanotubes/Polypropylene-based Coating Layer on the Composite Metal Filaments: Characteristic Evaluations and Radiation-shielded Fabric

Mei-Feng Lai,Chen-Hung Huang,Ching-Wen Lou,Yu-Chun Chuang,Cyun-Yu Wei,Jia-Horng Lin 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3

In this study, polypropylene (PP) and multi-walled carbon nanotubes (MWCNTs) are used to coat stainless steel(SS) wrapped yarns, the product of which is then fabricated into conductive textiles. Afterwards, the tensile properties,surface resistivity, and electromagnetic shielding effectiveness (EMSE) of conductive textiles are evaluated, therebydetermining the influences of the MWCNTs content. The test results show that using MWCNT can effectively improve themechanical properties of the coated yarns and conductive woven fabrics. In addition, 5 wt % of MWCNT provides the wovenfabrics with a lower surface resistivity and higher EMSE. The influences of the lamination angle and number of laminationlayers on EMSE are investigated, and the maximum EMSE of -49.89 dB occurs when the lamination angle is 0 °/90 °/0 °.

Bamboo Charcoal/Quick-Dry/Metallic Elastic Knits: Manufacturing Techniques and Property Evaluations

Jia-Horng Lin,Chih Hung He,Mong-Chuan Lee,Yueh-Sheng Chen,Ching-Wen Lou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7

Protective clothing with electromagnetic shielding effectiveness (EMSE) is a functional textile, which shieldselectromagnetic waves to protect the human body from the far infrared rays. Traditional EMSE garments primarily usemetallic plates for reflecting electromagnetic interference (EMI). However, they also have disadvantages of a heavy weight,easy corrosion, and high production cost. In this study, three different functional yarns are combined, during which the twistnumber of metallic wires is changed for a better shielding effect. A crochet machine is used to fabricate functional elasticknits with the metallic composite yarns as the warp- and weft-inlaid yarns. The test results show that double (D) functionalelastic knits exhibit EMSE of above 20 dB when the EMI are between 1.0 and 3.0 GHz. In addition, the knit structure canimprove breaking tensile strength by 170 % and increases bursting strength by 58 %, but undermines the tear strength by10 %. Although changing twist number of metallic composite yarns does not affect water absorption rate along the weftdirection, it helps increasing elastic recovery rate by 3.1 %, water absorption rate along the warp direction by 106 %, farinfraredemissivity by 2.3 %, water vapor transmission rate by 20 %, and air permeability by 6 %.

Synergistic Effects of Needle Punching and Shear-Thickening Fluid on Sandwich-Structured Composites Made of Nonwoven and Woven Fabrics

Xiayun Zhang,Ting-Ting Li,Hao-Kai Peng,Zhike Wang,Junli Huo,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7

This study explores the influences of needle punching and a shear-thickening fluid (STF) on the stab resistancesandwich-structured composites made of nylon nonwoven and aramid fabrics. Needle punching and different treatments ofaramid fabric are conducted to obtain the composites. The effects of needle punching and different treatments of aramidfabrics on the sandwich-structured composites were examined using quasi-static puncture resistance, quasi-static stabresistance, dynamic puncture resistance, and bursting property tests. Results show that needle punching and incorporation ofSTF positively influence the stab resistance of the composites. This study provides an innovative method to reduce thenumber of lamination layers and decrease the weight.

Photodynamic rechargeable nanofibrous membranes with high-efficient antibacterial/antiviral properties for medical protection

Lu Yang,Ying Zhang,Xianjin Hu,Bing-Chiuan Shiu,Ching-Wen Lou,Jia-Horng Lin,Ting-Ting Li 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-

Drug-resistant pathogens pose significant pressures and challenges for medical protective materials withhighly effective antibacterial/antiviral and rechargeable properties. In this study, a clean, rechargeablephotodynamic antibacterial/antiviral strategy was proposed after nanofibrous membranes were graftedby photosensitive 4,4, -terephthalic di-phthalic anhydride (TDPA) and natural polyphenol chlorogenicacid (CA) antibacterial agent. The resultant membrane released the maximumOH and H2O2 capacitiesof 6188.56 lg/g and 842.00 lg/g, respectively, exhibited the storage antibacterial stability even storedfor 30 days in the dark. After seven quenching, the charging capacity retained more than 70% of the original. The antibacterial efficiency of the membrane showed more than 99%. In addition, the antibacterialefficiency decreased by only 3% after water washing. Moreover, it demonstrated an excellent antiviralproperty whose antiviral activity against H3N2 achieved 3.6 PFU/mL. This daylight-driven rechargeablenanofibrous membrane can be used to develop reusable medical protective materials with rechargeableantibacterial and antiviral efficiency.

Effects of Heat Treatments on Puncture Resistant Properties of Polyamine and Polyamide-based Nonwoven Fabrics

Ting Ru Lin,Yan-Yu Lin,Ting An Lin,Jia-Ci Jhang,Ching-Wen Lou,Jia-Horng Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9

In countries with severe gun regulations, soldiers and police officers are commonly attacked by sharp weapons. The current personal protective equipment is too heavy, and therefore, in this study, mechanically strong Kevlar® fibers,nylon fibers, and Low-melting-point polyester (LMPET) fibers are needle punched to make thin, light, and comfortablenonwoven fabrics. Hot-baking and hot-pressing heat treatments are used for thermal bonding fibers, which subsequentlygenerate a dense and rigid surface because nonwoven fabrics are subjected to damaged structure by needle punch or aslippery state due to the fibers’ properties. The results of the air permeability, tensile strength, and quasi-static stab resistancetestings verify that the dense surface is correlated with hot-pressing heat treatment.

Polysufonamide/Stainless Steel Woven Fabrics: Manufacturing Techniques, Flame Retardance and Electromagnetic Shielding Effectiveness

Hao-Kai Peng,YanTing Wang,Ting-Ting Li,Ching-Wen Lou,XiaoXiao Wang,Jia-Horng Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4

In order to make conductive woven fabrics with electromagnetic shielding effectiveness (EMSE) and flameretardance, polysufonamide (PSA)/stainless steel (SS) core yarn are used as the weft yarns and PSA yarns are used as thewarp yarns. The conductive woven fabrics are denoted as SS-60, SS-80, SS-100, SS-120, and SS-140 according to the twistcounts of the core yarn, and evaluated in terms of mechanical properties, flame retardance, surface resistivity. The test resultsshow that the best twist of the core yarn is 120 turns/10 cm. SS-60 has the maximum burnt length, while SS-140 has theminimum burnt length. Moreover, the surface resistivity of the PSA/SS woven fabrics is proportional to the twist counts, andthe surface resistivity along the warp direction is higher than that along the weft direction. Changing the fabric laminationangle can form a complete shielding network, and the EMSE is significantly increased. For SS-80, SS-100, and SS-120,when they are composed of 4-6 layers with lamination angles of 0 o/45 o/90 o/-45 o/0 o/45 o and 0 o/90 o/0 o/90 o/0 o/90 o, theEMSE is above 40 dB and the shielding effect is above 99.99 % against the incident waves at 2000-3000 MHz. Specifically,SS-120 has the maximum EMSE of 64 dB against incident waves at 2844 MHz.