The influence of short-chain branching on the morphology and structure of polyethylene single crystals

	The influence of short-chain branching on the morphology and structure of polyethylene single crystals
	Vega, Juan F.1; Jargour, Nathalie 1,2,3; Nunez-Ramirez, Rafael 1; Liu, Guoming 4; Wang, Dujin 4; Trujillo, Mariselis 3; Mueller, Alejandro J.2,5,6; Martinez-Salazar, Javier 1
刊名	JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
	2015-12-15
卷号	53 期号:24 页码:1751-1762
关键词	branched crystallization polyolefins single-crystal habits structure
英文摘要	The influence of short-chain branching on the formation of single crystals at constant supercooling is systematically studied in a series of metallocene catalyzed high-molecular-weight polyethylene samples. A strong effect of short-chain branching on the morphology and structure of single crystals is reported. An increase of the axial ratio with short-chain branching content, together with a characteristic curvature of the (110) crystal faces are observed. To the best of our knowledge, this is the first time that this observation is reported in high-molecular-weight polyethylene. The curvature can be explained by a continuous increase in the step initiationstep propagation rates ratio with short-chain branching, that is, nucleation events are favored against stem propagation by the presence of chain defects. Micro-diffraction and WAXS results clearly indicate that all samples crystallize in the orthorhombic form. An increase of the unit cell parameter a(0) is detected, an effect that is more pronounced than in the case of single crystals with ethyl and propyl branches. The changes observed are compatible with an expanded lattice due to the presence of branches at the surface folding. A decrease in crystal thickness with branching content is observed as determined from shadow measurements by TEM. The results are in agreement with additional SAXS results performed in single crystal mats and with indirect calorimetry measurements. (c) 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1751-1762
收录类别	SCI
语种	英语
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29227]
专题	化学研究所_工程塑料实验室
作者单位	1.CSIC, IEM, Dept Fis Macromol, BIOPHYM, E-28006 Madrid, Spain 2.Univ Simon Bolivar, Dept Ciencia Mat, Grp Polimeros, Caracas 1080A, Venezuela 3.Univ Simon Bolivar, Dept Mecan, Grp Polimeros, Caracas 1080A, Venezuela 4.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 5.Univ Basque Country, UPV EHU, Fac Chem, POLYMAT & Polymer Sci & Technol Dept, Donostia San Sebastian 20018, Spain 6.Ikerbasque, Basque Fdn Sci, Bilbao, Spain
推荐引用方式 GB/T 7714	Vega, Juan F.,Jargour, Nathalie,Nunez-Ramirez, Rafael,et al. The influence of short-chain branching on the morphology and structure of polyethylene single crystals[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2015,53(24):1751-1762.
APA	Vega, Juan F..,Jargour, Nathalie.,Nunez-Ramirez, Rafael.,Liu, Guoming.,Wang, Dujin.,...&Martinez-Salazar, Javier.(2015).The influence of short-chain branching on the morphology and structure of polyethylene single crystals.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,53(24),1751-1762.
MLA	Vega, Juan F.,et al."The influence of short-chain branching on the morphology and structure of polyethylene single crystals".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 53.24(2015):1751-1762.