화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.19, No.11, 1179-1185, November, 2011
DOI10.1007/s13233-011-1103-6  Export Citation
Enhancing the Formation of the New Trigonal Polymorph in Isotactic Propene-1-Pentene Copolymers: Determination of the X-ray Crystallinity
Ernesto Perez†, Maria L. Cerrada, Rosario Benavente, and Jose M. Gomez-Elvira
  • Instituto de Ciencia y Tecnología de Polímeros ICTP-CSIC, Juan de la Cierva 3, 28006, Madrid, Spain
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A metallocene copolymer of isotactic propene and 1-pentene was subjected to different crystallization conditions with 13 mol% of 1-pentene counits, aiming to enhance the formation of a new trigonal modification of iPP. Since it was not possible to obtain a diffractogram for the amorphous sample of cPPe13 at room temperature, the X-ray crystallinity was determined using the profile of the molten polymer, extrapolated to room temperature according to the resulting temperature coefficients. The X-ray diffraction results indicate a very interesting polymorphism in this copolymer; when crystallized from solution, amazingly high degrees of crystallinity - as high as 65% - are obtained, and this value is similar to those obtained for the iPP homopolymer. Further, the enthalpy of melting for a 100% crystalline sample of the trigonal modification was estimated from those crystallinities and the actual enthalpies of melting.
Keywords:iPP-1-pentene copolymers;polymorphism;new trigonal iPP modification;X-ray diffractograms;thermal properties.
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