New Understanding on the Memory Effect of Crystallized <italic style="font-style: italic">i</italic>PP

Xiang-yang Li; Zhe Ma; Feng-mei Su; Nan Tian; You-xin Ji; Jie Lu; Zhen Wang; Liang-bin Li

doi:10.1007/s10118-014-1502-1

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New Understanding on the Memory Effect of Crystallized iPP

Updated：2021-06-21

- New Understanding on the Memory Effect of Crystallized iPP
- Chinese Journal of Polymer Science Vol. 32, Issue 9, Pages: 1224-1233(2014)
- Affiliations：
  
  a.National Synchrotron Radiation Laboratory, College of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
  b.Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600MB, Eindhoven, The Netherlands
  c.Department o f Polymer Science and Engineering, CAS Key Lab of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  **Liang-bin Li (李良彬), E-mail: lbli@ustc.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1502-1
  CLC：
- Received：31 March 2014，
  
  Revised：2014-04-13，
  
  Accepted：21 April 2014，
  
  Published：2014-09
- Accepted：
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Xiang-yang Li, Zhe Ma, Feng-mei Su, et al. New Understanding on the Memory Effect of Crystallized iPP[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1224-1233. DOI: 10.1007/s10118-014-1502-1.
DOI：

Xiang-yang Li, Zhe Ma, Feng-mei Su, et al. New Understanding on the Memory Effect of Crystallized iPP[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1224-1233. DOI: 10.1007/s10118-014-1502-1. DOI：

摘要

Abstract

In this study

recovery processes of isotactic polypropylene (

PP) melted spherulites at 135 ℃ after melting at higher temperatures (170 ℃–176 ℃) were investigated with polarized optical microscopy and Fourier transform infrared spectroscopy. The recovery temperature was fixed to exclude the interference from heterogeneous nuclei. After melting at temperatures between 170 ℃ and 174 ℃

the melted spherulite could recover back to the origin spherulite at low temperatures. Interestingly

a distinct infrared spectrum from iPP melt and crystal was observed in the early stage of recovery process after melting at low temperatures

where only IR bands resulting from short helices with 12 monomers or less can be seen

which indicates that the presence of crystal residues is not the necessary condition for the polymer memory effect. Avrami analysis further indicated that crystallization mainly took place in melted lamellae. After melting at higher temperatures

melted spherulite cannot recover. Based on above findings

it is proposed that the memory effect can be mainly ascribed to melted lamellae

during which crystalline order is lost but conformational order still exists. These conformational ordered segments formed aggregates

which can play as nucleation precursors at low temperatures.

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New Understanding on the Memory Effect of Crystallized iPP

DOI：10.1007/s10118-014-1502-1

摘要

Abstract

关键词

Keywords

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