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Infrared Imaging of Ring-Banded Spherulites Formed in Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymer: Segment Distribution and Orientation
Jin, Ying; Wang, Wei; Su, Zhaohui
2011-04-01
Source PublicationAPPLIED SPECTROSCOPY
ISSN0003-7028
Volume65Issue:4Pages:454-458
AbstractPoly(L-lactide) poly(ethylene glycol) (PLLA-PEG) diblock copolymer film was observed to exhibit ring-banded spherulite morphology when crystallized from melt. Polarized optical microscopy (POM) and atomic force microscopy (AFM) revealed that the ring-banded structure is composed of alternating concave and convex bands, which correspond to flat-on lamellae showing layered terrace-like morphology and edge-on lamellae showing fibrillar texture, respectively. The composition distribution and chain orientation within the ring-banded spherulite were further analyzed by Fourier transform infrared (FT-IR) imaging and polarized FT-IR. The data indicated that the concave bands are PLLA-rich domains, where PLLA chains are perpendicular to both the substrate and the radial direction of the spherulite, whereas the convex bands are rich in PEG, where the PLLA chains orient parallel to the substrate and the tangential direction of the spherulite. The orientation pattern of the PLLA segments in the concave and convex bands is attributed to the periodic twisting of PLLA lamellae along the radial growth direction in the formation process of the spherulite.
KeywordFourier Transform Infrared Imaging Ft-ir Spectroscopy Polarized Ft-ir Imaging Ring-handed Spherulite Poly(L-lactide) Plla Poly(Ethylene Glycol) Peg Block Copolymer Morphology Orientation Polarized Optical Microscopy Pom Atomic Force Microscopy Afm
DOI10.1366/10-06143
Indexed BySCI
Language英语
WOS IDWOS:000289013100015
PublisherSOC APPLIED SPECTROSCOPY
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73906
Collection中国科学院化学研究所
Corresponding AuthorSu, Zhaohui
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Jin, Ying,Wang, Wei,Su, Zhaohui. Infrared Imaging of Ring-Banded Spherulites Formed in Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymer: Segment Distribution and Orientation[J]. APPLIED SPECTROSCOPY,2011,65(4):454-458.
APA Jin, Ying,Wang, Wei,&Su, Zhaohui.(2011).Infrared Imaging of Ring-Banded Spherulites Formed in Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymer: Segment Distribution and Orientation.APPLIED SPECTROSCOPY,65(4),454-458.
MLA Jin, Ying,et al."Infrared Imaging of Ring-Banded Spherulites Formed in Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymer: Segment Distribution and Orientation".APPLIED SPECTROSCOPY 65.4(2011):454-458.
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