文献类型：期刊文献

英文题名：Crystallization behavior of "wet brush" and "dry brush" blends of PS-b-PEO-b-PS/h-PEO

作者：Luo, Chunyan[1]; Han, Xia[1]; Gao, Ying[2]; Liu, Honglai[1]; Hu, Ying[1]

机构：[1] Laboratory for Advanced Material, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China; [2] State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

年份：2009

卷号：113

期号：2

起止页码：907

外文期刊名：Journal of Applied Polymer Science

收录：EI(收录号：20092512142120)

语种：英文

外文关键词：Nucleation - Ethylene - Polystyrenes - Blending - Crystallization - Polyethylene oxides

摘要：The crystallization behavior of the blending system consists of homopolymer poly(ethylene oxide) (h- PEO) with different molecular weights, and polystyreneblock-poly (ethylene oxide)-block-polystyrene (PS-b-PEO-b-PS) triblock copolymer has been investigated by DSC measurements. The crystallization of PEO block (b-PEO) in block copolymer occurs under much lower temperature than that of the h-PEO in the bulk (ΔT > 65 °C), which is attributed to the homogeneous nucleation crystallization behavior of the b-PEO microdomains. In both the "drybrush" and the "wet brush" blending systems, the homogeneous nucleation crystallization temperature of PS-b- PEO-b-PS/h-PEO blends increases due to the increase of the domain size. The heterogeneous nucleation crystallization temperatures of h-PEO in the wet brush blending systems are higher than that of the corresponding h-PEO in the bulk. At the same time, the heterogeneous nucleation crystallization temperature of b-PEO10000 decreases from 43C to 30C and 40C in the h-PEO600 and h- PEO2000 blending systems, respectively, because of the stretching of the PEO chains in the wet brush. However, this kind of phenomenon does not happen in the dry brush blending systems. The self-seeding procedure was used to further ascertain the nucleation mechanism in the crystallization process. As a result, the self-seeding domains have been confirmed, and the difference between the dry brush and wet brush systems has been observed. ? 2009 Wiley Periodicals, Inc.