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PVDF/Poly(ethylene-co-vinyl acetate) 블렌드의 혼화성이 PVDF의 결정구조와 결정화 속도에 미치는 영향(II)
이종순,김갑진,Lee Jong Soon,Kim Kap Jin 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
The crystal structure of the blends of poly(vinylidene fluoride) (PVDF) and poly(vinyl acetate)(PVAc), ethylene/vinyl acetate (20/80) copolymer (PEVAc80), and ethylene/vinyl acetate (30/70) copolymer (PEVAc70) has been studied using a polarizing microscope equipped with a heating stage and an FT -IR spectrometer. The spherulitic morphology in the PVDF/PEVAc blend appeared as three different types, i.e., lamellar splay, concentric, and spiral type. As crystallization temperature and the content of amorphous PVAc and PEVAc80 miscible with PVDF increase, concentric ring and spiral ring type spherulites are formed more easily than in the case of PVDF and a PVDF/PEVAc70 blend system. The extinction band periodicity between the bright zone and the dark zone in the ring-banded spherulites observed under a crossed polarization was found to increase with increasing content of PVAc and PEVAc. Furthermore, the periodic distance between neighboring spiral arms increased from the core to the outer edge, and this may be ascribed to the preferential rejection of PEVAc chains into the inter-spiral regions during crystallization. The FT-IR analysis of samples quenched from the melt to various temperatures shows increase in $\beta-phase$ content as the amounts of PVAc and PEVAc80 blended increase and as the quenching temperature is reduced. In conclusion, the crystal morphology and structure in the PVDFIPVAc and PVDF/PEVAc blend systems were shown to be highly associated with the degree of miscibility of an added amorphous polymer with PVDF.
공단량체 bisesterdiamide 'T3T-dimethyl'을 사용한 폴리(트리메틸렌테레프 탈레이트)계 폴리에스터아미드의 합성과 특성분석
이종순,오태환,김갑진,Lee, Jong Soon,Oh, Tae Hwan,Kim, Kap Jin 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6
In order to impart new functions to poly(trimethylene terephthalate) (PTT) and to remove several well-known disadvantages of PTT such as changes in physical properties with ageing especially for undrawn and/or partially drawn PTT yarn a new type of polyesteramide based on PTT, poly(trimethylene terephthalate-co-trimethylene terephthalamide) [P(TT/TA)], has been synthesized using dimethyl terepthalate (DMT), T3T-dimethyl ((benzoic acid, 4-4'-[1-2-propanediylbis (iminocarbonyl)]bis-dimethyl ester) and 1,3-propanediol as monomers and tetraisopropyl titanate as a catalyst through a DMT process. The feed ratio of T3T-dimethyl was varied from $5-15mol\%$. The content of TA unit in P(TT/TA) was lower than the feed ratio of T3T-dimethyl. Intrinsic viscosity and melt viscosity of P(TT/TA) increased with increasing content of TA unit. Thermal properties of P(TT/TA) were also measured as a function of TA content using DSC and TGA.