ICCAS OpenIR
Crystallization and morphology of poly(ethylene oxide-b-lactide) crystalline-crystalline diblock copolymers
Huang, Shaoyong1; Jiang, Shichun1,2; An, Lijia1; Chen, Xuesi1
2008-07-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN0887-6266
Volume46Issue:13Pages:1400-1411
AbstractThe crystallization behaviors and morphology of asymmetric crystalline-crystalline diblock copolymers poly(ethylene oxide-lactide) (PEO-b-PLLA) were investigated using differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), and microscopic techniques (polarized optical microscopy (POM) and atomic force microscopy (AFM)). Both blocks of PEO5-b-PLLA(16) can be crystallized, which was confirmed by WAXD, while PEO block in PEO5-b-PLLA(30) is difficult to crystallize because of the confinement induced by the high glass transition temperature and crystallization of PLLA block with the microphase separation of the block copolymer. Comparing with the crystallization and morphology of PLLA homopolymer and differences between the two copolymers, we studied the influence of PEO block and microphase separation on the crystallization and morphology of PLLA block. The boundary temperature (T-b) was observed, which distinguishes the crystallization into high- and low-temperature ranges, the growth rate and morphology were quite different between the ranges. Crystalline morphologies including banded spherulite, dendritic crystal, and dense branching in PEO5-b-PLLA(16) copolymer were formed. The typical morphology of dendritic crystals including two different sectors were observed in PEO5-b-PLLA(30) copolymer, which can be explained by secondary nucleation, chain growth direction, and phase separation between the two blocks during the crystallization process. Lozenge-shaped crystals of PLLA with screw dislocation were also observed employing AFM, but the crystalline morphology of PEO block was not observed using microscopy techniques because of its small size. (C) 2008 Wiley Periodicals, Inc.
KeywordBlock Copolymers Crystalline-crystalline Diblock Copolymer Crystallization Morphology Phase Separation
DOI10.1002/polb.21474
Indexed BySCI
Language英语
WOS IDWOS:000257153200011
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64964
Collection中国科学院化学研究所
Corresponding AuthorJiang, Shichun
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Huang, Shaoyong,Jiang, Shichun,An, Lijia,et al. Crystallization and morphology of poly(ethylene oxide-b-lactide) crystalline-crystalline diblock copolymers[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2008,46(13):1400-1411.
APA Huang, Shaoyong,Jiang, Shichun,An, Lijia,&Chen, Xuesi.(2008).Crystallization and morphology of poly(ethylene oxide-b-lactide) crystalline-crystalline diblock copolymers.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,46(13),1400-1411.
MLA Huang, Shaoyong,et al."Crystallization and morphology of poly(ethylene oxide-b-lactide) crystalline-crystalline diblock copolymers".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 46.13(2008):1400-1411.
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