New Understanding on the Memory Effect of Crystallized iPP

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

Your Location：

Home >

Browse articles >

New Understanding on the Memory Effect of Crystallized iPP

Updated：2021-06-21

- New Understanding on the Memory Effect of Crystallized iPP
- New Understanding on the Memory Effect of Crystallized iPP
- Chinese Journal of Polymer Science 2014年32卷第9期页码：1224-1233
- 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：
  
  China Postdoctoral Science Foundation(2012M521233);Fundamental Research Funds for the Central Universities(WK2310000031);National Natural Science Foundation of China(51033004;51227801;51303166);This work was financially supported by the National Natural Science Foundation of China(51325301);973 program of MOST(2010CB934504)
- DOI：10.1007/s10118-014-1502-1
  中图分类号：
- 收稿：2014-03-31，
  
  修回：2014-04-13，
  
  录用：2014-04-21，
  
  纸质出版：2014-09
- Accepted：
Scan QR Code
Xiang-yang Li, Zhe Ma, Feng-mei Su, 等. New Understanding on the Memory Effect of Crystallized iPP[J]. Chinese Journal of Polymer Science, 2014,32(9):1224-1233.

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.
Xiang-yang Li, Zhe Ma, Feng-mei Su, 等. 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.

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.

关键词

Keywords

references

浏览量

Downloads

CSCD

文章被引用时，请邮件提醒。

Submit

工具集

关联资源

Memory Effect of Crystallization in 1-Butene/α-olefin Copolymers

Simultaneous Enhancement of Toughness and Strength of Stretched iPP Film via Tiny Amount of β-Nucleating Agent under “Shear-free” Melt-extrusion

Advantage of Preserving Bi-orientation Structure of Isotactic Polypropylene through Die Drawing

Isothermal Crystallization of iPP in Environment-friendly Diluents: Effect of Binary Diluents and Crystallization Temperature on Crystallization Kinetics

Enhanced Segment Mobility Promotes Stereocomplex Crystallization in Polymer Blends via Elevated Segmental Miscibility