Nylon/아라미드 원사특성이 방호의류용 에어텍스쳐사의 물성에 미치는 영향

김현아 ( Hyun Ah Kim ) 한국감성과학회 2014 감성과학 Vol.17 No.3

본 연구는 에어제트텍스쳐링 장치에서 공급되는 코어사와 이펙트사인 아라미드와 나일론의 구성이 방호의류용 아라미드/나일론 ATY와 아라미드 ATY의 물성변화에 대한 연구이다. 아라미드 필라멘트 표면의 매끄러움 때문에 아라미드 ATY의 강도 저하는 나일론 ATY에 비해 훨씬 높았다. 아라미드/나일론 ATY 강도는 ATY의 이펙트사인 나일론의 강도에 가장 영향을 많이 받았다. 나일론 ATY의 절단신도는 에어제트텍스쳐링 이전의 나일론에 비해 두 배정도 높은 값을 나타내었으며, 아라미드 ATY와 아라미드/나일론 ATY는 에어제트텍스쳐링 이전에 비해 5.9~6.7배 정도로 높았다. 아라미드 ATY의 초기탄성률은 아라미드의 에어제트텍스쳐링 이전에 비해 86.5%정도 감소하였으며, 아라미드/나일론 ATY의 초기탄성률은 아라미드 ATY와 나일론 ATY 초기탄성률의 산술평균치를 나타내었다. 아라미드/나일론 하이브리드 ATY의 습·건열 수축률은 나일론의 영향을 받음을 알 수 있었다. This study investigated the physical properties of aramid/nylon ATY and aramid ATY for protective garments according to the aramid and nylon characteristics fed on the core and effect components of air jet texturing equipment. Tenacity decrease of aramid ATY was much more higher than that of nylon ATY because of slick aramid filament surface. Tenacity of aramid/nylon ATY was most affected by the tenacity of nylon on the effect component of ATY. Breaking strain of nylon ATY was two times higher than that of nylon before air texturing, then, in case of aramid ATY and aramid/nylon ATY, were 5.9-6.7 times higher than those before air texturing. Initial modulus decrease of aramid ATY showed 86.5% of initial modulus of aramid before air texturing, then aramid/nylon hibrid ATY showed arithmetic average value of initial modulus of aramid and nylon ATY. Wet and dry thermal shrinkages of aramid/nylon hybrid ATY were dominated by those of nylon filament the effect component of ATY.

혼련 조건이 Nylon/PPE/Graphene Oxide 복합체의 상구조에 미치는 영향

이정우(Jungwoo Lee),김형수(Hyungsu Kim) 한국고분자학회 2017 폴리머 Vol.41 No.5

Nylon/poly(phenylene ether)(PPE)/graphene oxide(GO) 복합체를 제조할 경우에 일정한 함량(0.5 wt%)의 GO가 성분 고분자(PPE/nylon=10/90)와 혼련되는 순서에 따른 복합체의 미세구조 변화를 조사하였다. PPE, nylon, GO가 동시에 혼련되거나 미리 혼련된 nylon/GO를 PPE와 혼련시킬 경우에는 GO가 주로 nylon 상에 존재하였다. 이와는 대조적으로, PPE/GO를 먼저 혼련시킨 후 nylon과 다시 혼련시킬 경우에는 GO가 nylon과 PPE의 계면에 존재하는 경향을 나타내었으며 GO의 분산상태도 박리 구조에 가까운 우수한 분산성을 나타내었다. 이러한 상구조가 유지되는 복합체의 경우는 전자의 두 경우들과 비교했을 때, 분산상의 평균 입자 크기가 가장 작았으며 열처리후의 전체적인 상구조도 상대적으로 더 안정함을 보였다. 박리된 GO가 nylon과 PPE의 계면에 존재할 경우 점도의 전단율 의존성과 저장탄성률이 가장 크게 나타났으며 nylon의 결정화가 제한적으로 진행되는 것으로 확인되었다. The microstructure of nylon/poly(phenylene ether) (PPE)/graphene oxide (GO) composites was investigated. The major interest was focused on the effect of mixing protocol on the dispersion and localization of GO in the composites. When the three components are blended at the same time or nylon/GO is premixed prior to the blending with PPE, GO particles were mainly placed in nylon phase. By contrast, when the premixed PPE/GO is blended with nylon, the state of GO dispersion was remarkably improved to yield an exfoliated structure. Furthermore, some of the GO were found at the interface of nylon and PPE. In this particular phase structure, the average domain sizes were significantly reduced and maintained stable after the annealing process. It was found that the shear sensitivity and storage moduli of the composite were increased and the crystallization of nylon was limited by the GO platelets located at the interface of nylon and PPE.

PBT와 Nylon6,12의 블렌드 특성과 core/shell 구조를 갖는 PBT/Nylon6,12 미세모의 제조 및 압출조건

박희만 ( Hui Man Park ),이선호 ( Seon Ho Lee ),곽노석 ( Noh Seok Kwak ),황치원 ( Chi Won Hwang ),박성규 ( Sung Gyu Park ),황택성 ( Taek Sung Hwang ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.6

압출성형을 통한 core/shell 구조를 갖는 폴리부틸렌테레프탈레이트(PBT)/Nylon6,12 미세모를 제조함에 있어 최적의 압출조건을 규명하기 위하여, 압출온도와 배합비를 다르게 하여 제조한 블렌드 미세모의 상용성을 SEM 모폴로지와 DSC 분석을 통해 확인하고 UTM을 통해 압출속도에 따른 기계적 물성의 변화를 측정하였다. SEM 모폴로지 분석결 과 압출온도가 증가할수록 분산상인 Nylon6,12 비드의 크기가 감소하였으며, Nylon6,12의 함량이 증가할수록 PBT 매 트릭스 내 Nylon6,12의 상분리 현상이 감소하였다. DSC 분석 결과도 같은 경향을 나타냈는데, 압출온도가 상승함에 따라 녹는점에 해당하는 피크들의 경계가 사라지고, Nylon6,12의 비율이 증가할수록 두 피크의 간격이 좁아지는 것을 확인할 수 있었다. 한편 PBT/Nylon6,12 블렌드 미세모의 인장강도와 연신율 및 굴곡강도와 굴곡탄성률 모두 압출온도 가 260˚C 일 때까지 증가하였으나 그 이상의 온도에서는 오히려 감소하였다. 260˚C에서의 인장강도와 연신율, 굴곡 강도, 굴곡탄성률은 각각 560 kgf/cm2와 220%, 807 kgf/cm2, 22,146 kgf/cm2였는데 이는 PBT와 Nylon6,12의 중간 값을 상회하는 수치로 두 물질이 압출성형에 의한 블렌드 효과가 있다는 것을 확인할 수 있었다. 이처럼 우수한 상용성을 보일 때의 블렌드 압출 조건들을 토대로 하여 core/shell 구조의 이중구조 미세모를 제조하였다. Poly (butylene terephthalate) (PBT)/Nylon6, 12 core/shell micro fiber were prepared by extrusion molding, To investigate their optimum extrusion conditions, compatibility of PBT/Nylon6, 12 blend micro fiber in conformity to their weight ratio and manufacture temperature was explored with SEM morphology and DSC, The alterations in their mechanical properties by extrusion speed were compared and analyzed through a UTM. In comparison with SEM figures, the domain sizes of Nylon6, 12 were gradually declined by increasing the extrusion temperature of blends. Furthermore, according to these SEM images, the phase separation between Nylon6, 12 domain and PBT matrix became indistinct with increasing of weight percentage of Nylon6, 12. In case of DSC, the boundaries of two peaks were almost disappeared when increasing the extrusion temperature and also intervals of each two melting peaks became narrow as increasing the Nylon6, 12 ratio, The mechanical properties including tensile strength, elongation, flexural strength and flexural modulus were increased as the increase in the extrusion temperature until 260˚C. However, the mechanical properties were actually deteriorated over 260˚C. The tensile strength, elongation, flexural strength and flexural modulus at 260˚C were 560 kgf/cm2, 220%, 807kgf/cm2 and 22,146 kgf/cm2, respectively. These values are more than intermediate values of mechanical properties of PBT and Nylon6, 12. These results mean that there is compatibility between PBT and Nylon6, 12. Based on the extrusion conditions that produced optimum compatibility of blend, as a result, our group obtained micro fibers with the core/shell structure.

흡수율을 고려한 폴리아미드의 절삭조건에 관한 연구

김남진,김희남 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-

Nowadays, new and improved plastic materials are being produced due to advancements in the production of composite chemicals. The increased use of these materials has led to the study of new and improved cutting methods. These composite materials consist mainly of nylon resin. There are five types of nylon resin: nylon 6, nylon 66, nylon 12, nylon 46, and MC nylon. Nylon resin is usually molded during production, but the molding of nylon resin results in less accurate measurements. Because of this inaccuracy, the nylon resin must be cut using optimum cutting methods. One major concern, however, is that nylon resin is very sensitive to heat and water absorption. Sumner heat and humidity can cause the deformation of nylon resin and result in inaccuracy during production. In this paper, then I will study the resistance force surface roughness of MC nylon which has absorbed water.

아크릴산을 그라프트 중합한 나일론 직물의 혈액 단백질 호구 세척성에 관한 연구(II) -그라프트 나일론 직물의 헤모글로빈 세척기구-

오수민,송화순 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.5

Nylon fabric was grafted to improve detergency against hemoglobin, a protein soil. With free-radical chemical initiator systems, the grafting of acrylic acid(AA) as a hydrophilic vinyl monomer was performed to change surface free energies. Ammonium persulfate(APS) was used as an initiator and acrylic acid grafted nylon was treated with NaOH solution. The properties of the nylon, such as water uptake and the hemoglobin removal rate, were investigated. The water uptake of nylon increased after grafting and alkaline treatment. Hemoglobin was easily removed from grafted nylon, while it was difficult to remove hemoglobin from ungrafted nylon. The detergency of hemoglobin for grafted nylon decreased when the graft ratio exceeded 15%. The detergency of hemoglobin increased markedly with increasing washing time and washing temperature. The removal of hemoglobin was found to fit well to a first order reaction of time. The rate constant of hemoglobin removal for 5% nylon-g-NaAA is larger than that for ungrafted nylon. It means that the detergency of hemoglobin was improved due to grafting and alkaline treatment.

Preparation of nylon 12 nanocomposite and their characterization

한세미,양미선,정민선,김백진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Fuel tube for automotive consist of multi-layers which are nylon-EVAPVdF- nylon and these fuel tube need to reduce failure rate and simplify the number of layers owing to cost benefit and productivity. Fuel tube was mainly used nylon 12 because they have high dimensional stability, lower moisture abxorption compare to other nylons. Fuel tube with mult-layers have a good barrier property against fuel gas emission but they have disadvantages of complicate manufacturing process to make multilayered fuel tube and require many polymer materials. In our study we try to reduce the number of fuel tube layers, so the layered nanosilicates with highly aspect ratio was used for nylon 12 nanocomposite. Firstly we prepared nylon 12 nanocomposite via internal mixer and found out the well dispersed nanosilicate in nylon 12 matrix from TEM. Secondly we will prepare nylon 12 nanocomposite via twin screw extruder and investigate the scattered silicate particles within the nylon 12 matrix through TEM (including XRD). And we will suggest optimum processing temperature, screw rpm etc.

Effects of nylon6 content on thermal properties of nylon6/epoxy blend

김동규,김관우,한웅,김병주 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

In this work, the effects of blend composition composed of 0, 10, 20, 30, and 40 wt.% of nylon6 to epoxy resin were investigated in terms of cure kinetics and thermal stability by DSC and TGA. As the content of the nylon6 increased, the maximum exothermic temperature (T_m) and the value of cure activation energy (E_a) were decreased. Nylon-dispersedphase interferes with the exothermic reaction of the epoxy, and affects on the decrease in the reaction temperature. From TGA analysis results of the DGEBA / nylon6, the thermal stability based on the thermal stability index (A*·K*) and integral procedure decomposition temperature (IPDT) were increased with increase in the nylon6 content. This was because of the combination of the DGEBA and nylon6 having good heat resistace, resulting in improving thermal stability of the DGEBA/nylon6.

PET/Nylon66/Clay 나노복합재료의 열적물성 및 표면특성

이민호 ( Min Ho Lee ),구자훈 ( Ja Hun Ku ),민병훈 ( Byung Hun Min ),김정호 ( Jeong Ho Kim ) 한국공업화학회 2011 공업화학 Vol.22 No.5

본 연구에서는 PET와 Nylon66의 블렌드에 몬모릴로나이트(PM) 또는 유기화제로 개질된 clay (Cloisite 25A 또는 15A)를 첨가하여 PET/Nylon66/clay 나노복합재료를 제조하였다. 나노복합재료는 용융삽입법을 이용하여 제조하였고 DSC 측정을 이용하여 분석한 결과 clay의 첨가로 인해 PET/Nylon66 블렌드의 결정화특성이 변화되는 것을 확인하였다. 특히 C25A가 PET/Nylon66 블렌드와의 상호작용이 가장 커서 결정화온도를 가장 크게 변화시키는 것으로 나타났다. 나노복합재료의 표면을 AFM으로 관찰한 결과에서도 C25A를 이용한 나노복합재료가 가장 표면의 굴곡이 적어서 상대적으로 표면이 균일한 것으로 나타났고 기계적 물성측정에서도 전반적으로 C25A를 이용한 나노복합재료가 우수한 물성을 나타내는 것으로 관찰되었다. 각 나노복합재료의 표면 극성도를 조사하기 위하여 접촉각 측정을 하였는데 유기화 정도가 클수록 표면의 접촉각이 커져서 극성이 낮아지는 것을 확인하였다. Nanocomposites of blends of polyethyleneterephthalate (PET) and polyamide66 (Nylon66) containing natural and organically modified montmorillonite clays (PM, Cloisite((R)) 25A and 15A) were prepared by melt mixing. DSC results showed that the addition of clay changed the crystallization behavior of PET/Nylon66 nanocomposites. Clay C25A was observed to most significantly change the crystallization temperature than other clays in blends of PET and Nylon66, which may be caused by the difference in interaction with matrix polymers. AFM results also showed that the lowest value of surface roughness was observed for nanocomposites containing C25A indicating the smooth and relatively homogenous surface. Mechanical properties measurement showed the similar results. Contact angle was measured to study the difference in hydrophobicity. An increase in contact angle was observed for nanocomposites with C25A or C15A due to the increased hydrophobicity.

Variation of physical properties of nylon-66/clay nanocompositeswith preparation conditions

채동욱,Jung Ho Lim,Jae Sik Seo,김병철 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.1

Nylon-66 was melt compounded with 5 wt% nanosized organoclay varying the mixing rate and mixing time and their effects on the structure and properties of the nanocomposites were discussed in terms of the dispersion state of nanoclay. For the preparation of the nanocomposites, the total apparent shear (mixing rate mixing time) was fixed to 450 at three different combinations of mixing rate (30, 60, 90rpm) and mixing time (5, 7.5, 15min). While the pristine organoclay showed a (001) peak at 2q = 4.9o in the WAXD patterns, nylon-66/clay nanocomposites gave the disappearance of the peak regardless of mixing conditions, suggesting an exfoliated clay morphology in the nylon 66 matrix. The exfoliation of nanoclay in the nylon-66 matrix was also demonstrated by TEM measurements. On the contrary, rheological measurements revealed that the dispersion state of nanoclay was significantly influenced by the preparation conditions. The dynamic viscosity (h) of nylon-66/clay nanocomposites was increased as mixing rate was increased. For the normalized viscosity (h(t)/h(0)) obtained by time sweep at a given frequency, all the nanocomposites presented a decreased and upturned trend at the measuring time of ca. 500s, while nylon-66 showed an increased one over the entire time range. Nylon-66/clay nanocomposites gave lower value of tand with increasing mixing rate. In the logarithmic plot of storage modulus versus loss modulus, the nanocomposites prepared at higher mixing rate gave smaller slope, indicative of an increased heterogeneity. Nanoclay played a role of nucleating agent for nylon-66 by increasing the crystallization temperature, which was more pronounced at lower mixing rate. The induction time rheologically obtained from time sweep measurement at 1 rad/s at 235oC was shorter for the nanocomposites prepared at lower mixing rate, but at 3 rad/s it was little affected by the preparation conditions.

Self-cleaning Properties of Nylon 6 Fabrics Treated with Corona and TiO2 Nanoparticles under Both Ultraviolet and Daylight Irradiations

Fatemeh Emami,Shahla Shekarriz,Zahra Shariatinia,Zahra Moridi Mahdieh 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5

Nylon 6 fabric with self-cleaning properties was prepared by corona discharge pre-treatment and coating with TiO2 nanoparticles (NPs) using pad-dry-cure technique. The self-cleaning property was studied by discoloration of methylene blue (MB), ketchup, tea and coffee stains from the corona+TiO2 treated nylon-6 fabric. Color difference (ΔΕ*), reflectance (R) and K/S of MB stain were investigated by diffuse reflectance spectrophotometry. The MB stain was almost completely removed from the corona+TiO2 treated nylon surface after 24 h under UV light/daylight irradiation. Both of these phenomena (corona and TiO2) led to an increase in the discoloration of stains under UV and daylight irradiations. The EDS analysis showed an increase in the concentration of deposited TiO2 NPs coating after corona treatment. The FE-SEM images revealed that the surface of nylon 6 was coarser after the corona treatment. Also, the FE-SEM micrographs exhibited that a uniform layer of TiO2 NPs was formed on the corona treated nylon fabric. The corona+TiO2 treated nylon illustrated antibacterial activity against E. coli and B. subtillis microorganisms. The EDS and FE-SEM analysis confirmed that after 5 washing cycles, the amount of TiO2 NPs was higher on the surface of corona+TiO2 treated nylon than that of the fabric only treated with TiO2 without corona pretreatment. This result justifies that the corona+TiO2 treated nylon fabric with appropriate self-cleaning property can be applied cost-effectively in the textile industry.