Crystal growth mechanism changes in pseudo-dewetted poly(ethylene oxide) thin layers

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	Crystal growth mechanism changes in pseudo-dewetted poly(ethylene oxide) thin layers
	Zhu, DS ; Liu, YX ; Chen, EQ ; Li, M ; Chen, C ; Sun, YH ; Shi, AC ; Van Horn, RM ; Cheng, SZD
刊名	MACROMOLECULES
	2007
卷号	40 期号:5 页码:1570
ISSN号	0024-9297
中文摘要	Changes in the crystal growth mechanism were observed in pseudo-dewetted, thin layers of low molecular weight (MW) poly(ethylene oxide) (PEO) on a hydrophilic mica surface. The studies were conducted using two PEO fractions (HPEO and MHPEO) with similar MW's (number-average MW of around 4500 g/mol) but different end-group chemistries. For the HPEO, both ends of the chain are capped by -OH groups. For the MHPEO, one end is capped by an -OH group, while the other end is capped by an -OCH3 group. Utilizing in-situ atomic force microscopy, the growth of single crystals as a function of time (t) was monitored at different crystallization temperatures (T-x). Depending on the end-group chemistry and T-x applied, two growth laws were observed, which state that the crystal lateral size r or the crystal volume V can be linearly proportional to t (r proportional to t or V proportional to t). Combined with morphological observations of the single crystals, it could be deduced that when r proportional to t, the crystal growth was nucleation-limited (NL), while in the case of V proportional to t, and thus r proportional to t(0.5) at constant crystal thickness, the crystal growth was diffusion-limited (DL). A change of the crystal growth mechanism from the NL to the DL process was also observed with decreasing T-x in the MHPEO sample.
收录类别	SCI
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/35337]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhu, DS,Liu, YX,Chen, EQ,et al. Crystal growth mechanism changes in pseudo-dewetted poly(ethylene oxide) thin layers[J]. MACROMOLECULES,2007,40(5):1570.
APA	Zhu, DS.,Liu, YX.,Chen, EQ.,Li, M.,Chen, C.,...&Cheng, SZD.(2007).Crystal growth mechanism changes in pseudo-dewetted poly(ethylene oxide) thin layers.MACROMOLECULES,40(5),1570.
MLA	Zhu, DS,et al."Crystal growth mechanism changes in pseudo-dewetted poly(ethylene oxide) thin layers".MACROMOLECULES 40.5(2007):1570.