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Molecular Mechanism Leading to Memory Effect of Mesomorphic Isotactic Polypropylene
Li, Xiangyang1; Liu, Yanping2,3; Tian, Xingyou1; Cui, Kunpeng4,5
2016-08-15
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume54Issue:16Pages:1573-1580
AbstractIn this study, memory effect of mesomorphic isotactic polypropylene (iPP) was investigated using polarized optical microscope and small-angle X-ray scattering. Differing from classical memory effect, mesomorphic iPP melt had a higher growth rate and a higher memory temperature. The relative growth rate increased with increasing crystallization temperature. Lauritzen-Hoffman plots indicated that the increased growth rate arose from reduced surface nucleation barrier. The highest memory temperature was estimated to be 185 degrees C, which was close to the equilibrium melting point of iPP crystal. Additionally, Small-angle X-ray scattering measurements showed that a liquid crystal layer might exist between lamellar and amorphous layers. Based on above results, a crystallization model was proposed. In the mesomorphic iPP melt, there exist aggregates structurally similar to beta phase except a-phase crystal residuals, which cannot act as nucleation sites or transform to b crystal through surface nucleation. The only way for the aggregate is to transform to a crystal during crystal growth. The aggregate decreases the surface nucleation barrier and promotes the helical growth, leading to higher growth rate. Only when the aggregate relaxes to polymer coils through thickening at a higher temperature, can the memory effect be erased. (C) 2016 Wiley Periodicals, Inc.
SubtypeArticle
KeywordActivation Energy Crystallization Growth Rate Lamellar Memory Effect Mesomorphic Ipp Poly(Propylene) (Pp) Saxs Small-angle X-ray Scattering Surface Nucleation
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(51303166) ; National Center for International Research of Micro-nano Molding Technology ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03) ; National Natural Science Foundation of China(51303166) ; National Center for International Research of Micro-nano Molding Technology ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03)
DOI10.1002/polb.24051
WOS KeywordSHEAR-INDUCED NUCLEATION ; ISOTHERMAL CRYSTALLIZATION ; POLYMER CRYSTALLIZATION ; MELT MEMORY ; SYNDIOTACTIC POLYPROPYLENE ; CRYSTAL NUCLEATION ; SINGLE-CRYSTALS ; SELF-NUCLEATION ; POLYETHYLENE ; FLOW
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(51303166) ; National Center for International Research of Micro-nano Molding Technology ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03) ; National Natural Science Foundation of China(51303166) ; National Center for International Research of Micro-nano Molding Technology ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03)
WOS Research AreaPolymer Science
WOS SubjectPolymer Science
WOS IDWOS:000381295400004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/24581
Collection应用技术研究所
Affiliation1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Appl Technol, Hefei 230088, Peoples R China
2.Zhengzhou Univ, Natl Ctr Int Res Micronano Molding Technol, Zhengzhou 450002, Peoples R China
3.Zhengzhou Univ, Key Lab Micro Molding Technol Henan Prov, Zhengzhou 450002, Peoples R China
4.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China
5.Univ Sci & Technol China, Coll Nucl Sci & Technol, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Li, Xiangyang,Liu, Yanping,Tian, Xingyou,et al. Molecular Mechanism Leading to Memory Effect of Mesomorphic Isotactic Polypropylene[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2016,54(16):1573-1580.
APA Li, Xiangyang,Liu, Yanping,Tian, Xingyou,&Cui, Kunpeng.(2016).Molecular Mechanism Leading to Memory Effect of Mesomorphic Isotactic Polypropylene.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,54(16),1573-1580.
MLA Li, Xiangyang,et al."Molecular Mechanism Leading to Memory Effect of Mesomorphic Isotactic Polypropylene".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 54.16(2016):1573-1580.
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