MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

Citation: Guo-liang Zhang, Liu-xin Jin, Ping Zheng, Wei Wang, Xiao-jing Wen. MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)[J]. Chinese Journal of Polymer Science, 2013, 31(5): 798-808. doi: 10.1007/s10118-013-1273-0 shu

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

基金项目:
This work was financially supported by the National Science Foundation of China (No. 20874053).

摘要: Crystal patterns in ultrathin films of six poly(ethylene oxide) fractions with molecular weights from 25000 to 932000 g/mol were characterized within crystallization temperature range from 20℃ to 60℃. Labyrinthine, dendritic and faceted crystal patterns were observed in different temperature ranges, and then labyrinthine-to-dendritic and dendritic-to-faceted transition temperatures TL-D and TD-F were quantitatively identified. Their molecular weight dependences are TL-D(Mw) = TL-D() - KL-D/Mw, where TL-D() = 38.2℃ and KL-D = 253000℃g/mol and TD-F(Mw) = TD-F()-KD-F/Mw, where TD-F() = 54.7℃ and KD-F = 27000℃g/mol. Quasi two-dimensional blob models were proposed to provide empirical explanations of the molecular weight dependences. The labyrinthine-to-dendritic transition is attributed to a molecular diffusion process change from a local-diffusion to diffusion-limited-aggregation (DLA) and a polymer chain with Mw253000 g/mol within a blob can join crystals independently. The dendritic-to-faceted transition is attributed to a turnover of the pattern formation mechanism from DLA to crystallization control, and a polymer chain with a Mw27000 g/mol as an independent blob crosses to a depletion zone to join crystals. These molecular weight dependences reveal a macromolecular effect on the crystal pattern formation and selection of crystalline polymers.

关键词:

English

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

Received Date: 20 December 2012
Revised Date: 28 January 2013
Available Online: 05 May 2013
Fund Project:
This work was financially supported by the National Science Foundation of China (No. 20874053).

Abstract: Crystal patterns in ultrathin films of six poly(ethylene oxide) fractions with molecular weights from 25000 to 932000 g/mol were characterized within crystallization temperature range from 20℃ to 60℃. Labyrinthine, dendritic and faceted crystal patterns were observed in different temperature ranges, and then labyrinthine-to-dendritic and dendritic-to-faceted transition temperatures TL-D and TD-F were quantitatively identified. Their molecular weight dependences are TL-D(Mw) = TL-D() - KL-D/Mw, where TL-D() = 38.2℃ and KL-D = 253000℃g/mol and TD-F(Mw) = TD-F()-KD-F/Mw, where TD-F() = 54.7℃ and KD-F = 27000℃g/mol. Quasi two-dimensional blob models were proposed to provide empirical explanations of the molecular weight dependences. The labyrinthine-to-dendritic transition is attributed to a molecular diffusion process change from a local-diffusion to diffusion-limited-aggregation (DLA) and a polymer chain with Mw253000 g/mol within a blob can join crystals independently. The dendritic-to-faceted transition is attributed to a turnover of the pattern formation mechanism from DLA to crystallization control, and a polymer chain with a Mw27000 g/mol as an independent blob crosses to a depletion zone to join crystals. These molecular weight dependences reveal a macromolecular effect on the crystal pattern formation and selection of crystalline polymers.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

English

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

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MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

English

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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