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Formation of phase structure and crystallization behavior from disordered melt for.pdf

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Formation of phase structure and crystallization behavior from disordered melt for

lable at ScienceDirect Polymer 51 (2010) 799–806Contents lists avaiPolymer journal homepage: www.elsevier .com/locate/polymerFormation of phase structure and crystallization behavior from disordered melt for ethylene-isoprene block copolymers and their blends Hiroki Takeshita a, Yuan-Ji Gao a,1, Yusuke Takata a, Katsuhiko Takenaka a,b, Tomoo Shiomi a,b,*, Chifei Wu c aDepartment of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka. Niigata 940-2188, Japan bCenter for Green-Tech Development in Asia, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka. Niigata 940-2188, Japan c School of Materials Science and Technology, East China University of Technology, 130 Meilong Road, Shanghai 200237, Chinaa r t i c l e i n f o Article history: Received 12 August 2009 Received in revised form 2 December 2009 Accepted 10 December 2009 Available online 21 December 2009 Keywords: Crystallization Phase structure Poly(ethylene)-poly(isoprene) block copolymer* Corresponding author. Department of Materia Nagaoka University of Technology, 1603-1 Kamitom 2188, Japan. Fax: t81 258 47 9300. E-mail address: shiomi@vos.nagaokaut.ac.jp (T. Sh 1 Present address: Industrial Systems Group, Hitach 0032-3861/$ – see front matter 2009 Elsevier Ltd. doi:10.1016/j.polymer.2009.12.012a b s t r a c t The structure formation and crystallization kinetics in crystallization from a disordered melt were investigated for a polyethylene-polyisoprene block copolymer (LEI) having Mn ? 3.2 104 and 53 wt% of polyethylene content and for its blends with the corresponding homopolymers, polyethylene (PE) and polyisoprene (PIp), using synchrotron small-angle X-ray scattering techniques (SAXS) and differential scanning calorimetry (DSC). For LEI copolymer and the blends, no microphase separation structure was observed in the molten state. In the crystalline state of the neat LEI, the first and higher order scattering peaks were clearly observed, in which the