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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
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.