NDLI: New understanding on the memory effect of crystallized iPP

Content Provider	Springer Nature Link
Author	Li, Xiang yang Ma, Zhe Su, Feng mei Tian, Nan Ji, You xin Lu, Jie Wang, Zhen Li, Liang bin
Copyright Year	2014
Abstract	In this study, recovery processes of isotactic polypropylene (iPP) melted spherulites at 135 °C after melting at higher temperatures (170 °C–176 °C) 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 °C and 174 °C, 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.
Starting Page	1224
Ending Page	1233
Page Count	10
File Format	PDF
ISSN	02567679
Journal	Chinese Journal of Polymer Science
Volume Number	32
Issue Number	9
e-ISSN	14396203
Language	English
Publisher	Chinese Chemical Society and Institute of Chemistry, CAS
Publisher Date	2014-07-25
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Memory effect Isotactic polypropylene Conformational ordering Topological connectivity Aggregate Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Chemical Engineering Polymers and Plastics

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