Systematic Kinetic Analysis on Mono layer Lamellar Crystal Thickening   via Chain-Sliding Diffusion of Polymers

doi:10.1021/ma301926p

CORC > 北京大学 > 化学与分子工程学院

	Systematic Kinetic Analysis on Mono layer Lamellar Crystal Thickening via Chain-Sliding Diffusion of Polymers
	Wang, Mingqiu ; Gao, Huanhuan ; Zha, Liyun ; Chen, Er-Qiang ; Hu, Wenbing
刊名	macromolecules
	2013
关键词	ATOMIC-FORCE MICROSCOPY POLYETHYLENE SINGLE-CRYSTALS POLY(ETHYLENE OXIDE) HIGH-PRESSURE GROWTH RATES CRYSTALLIZATION MORPHOLOGY SIMULATIONS FRACTIONS BEHAVIOR
DOI	10.1021/ma301926p
英文摘要	Lamellar polymer crystals are metastable due to their limited lamellar thickness. We performed dynamic Monte Carlo simulations of lattice linear polymers to investigate the kinetics of isothermal thickening via chain-sliding diffusion in single lamellar crystals of polyethylene and poly(ethylene oxide). We sorted out three typical cases for controversial experimental observations. The basic case is a continuous increase of lamellar thickness for heavily folded long chains, with a logarithmic time dependence typical at the lateral growth front. Its kinetics is dominated by the activation energy barrier for sliding diffusion with higher speeds at higher temperatures. For integer-folded short chains, however, the lamellar thickness increases discontinuously, and its kinetics is dominated by a free energy barrier for surface nucleation. The latter can be further split into two cases: the thickening in the melt is mainly driven by the bulk free energy, with lower speeds at higher temperatures due to a temperature-sensitive barrier; while the thickening on a solid substrate is mainly driven by the surface free energy, with higher speeds at higher temperatures due to a temperature-insensitive barrier. The simulations facilitate our systematic understanding to the case-by-case microscopic mechanisms for the thickening of monolayer lamellar crystals via sliding diffusion of polymers.; Polymer Science; SCI(E); EI; 0; ARTICLE; 1; 164-171; 46
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/227348]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Wang, Mingqiu,Gao, Huanhuan,Zha, Liyun,et al. Systematic Kinetic Analysis on Mono layer Lamellar Crystal Thickening via Chain-Sliding Diffusion of Polymers[J]. macromolecules,2013.
APA	Wang, Mingqiu,Gao, Huanhuan,Zha, Liyun,Chen, Er-Qiang,&Hu, Wenbing.(2013).Systematic Kinetic Analysis on Mono layer Lamellar Crystal Thickening via Chain-Sliding Diffusion of Polymers.macromolecules.
MLA	Wang, Mingqiu,et al."Systematic Kinetic Analysis on Mono layer Lamellar Crystal Thickening via Chain-Sliding Diffusion of Polymers".macromolecules (2013).