Observation of banded spherulites in pure poly(L-lactide) and its miscible blends with amorphous polymers
文献类型：期刊论文
| 作者 | Xu, J; Guo, BH; Zhou, JJ; Li, L; Wu, J; Kowalczuk, M |
| 刊名 | POLYMER
 |
| 出版日期 | 2005-10-07 |
| 卷号 | 46期号:21页码:9176-9185 |
| 关键词 | Poly(L-lactide) Banded Spherulites Polymer Blends |
| ISSN号 | 0032-3861 |
| DOI | 10.1016/j.polymer.2005.07.010 |
| 英文摘要 | Banded spherulites of pure poly(L-lactide) (PLLA) were observed via the 'crystallization after annealing' procedure, while only common spherulites were obtained via the 'direct isothermal crystallization' procedure. Wide angle X-ray diffraction revealed that the two types of spherulites had the same crystal lattice of a-modification. Atomic force microscopy demonstrated that the alternative negative and positive birefringent bands resulted from the alternative edge-on and flat-on lamellar orientations in the spherulites. Furthermore, the effect of thermal history on the spherulitic morphology was investigated in details. The PLLA samples melted for longer time or those with lower melting point were more likely to form banded spherulites. The possibility that the change of molecular weight was a determining factor of banding was excluded by the results on differently prepared samples with the same molecular weight. Therefore, we conclude that it was complete melting of the crystalline residues that favored formation of PLLA banded spherulites. Blending of PLLA with atactic poly(D,L-lactide) or poly[(R,S)-3-hydroxybutyrate], led to reduced band spacing. Effect of blending on the chain mobility, spherulite growth kinetics, supercooling and lamellar surface energy was quantitatively studied, which suggests that the blending-reduced band spacing cannot be attributed to the above factors. Therefore, there are other blending-relevant factors leading to the reduced band spacing. (c) 2005 Elsevier Ltd. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000232172900030 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/57499]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Guo, BH |
| 作者单位 | 1.Tsing Hua Univ, Dept Chem Engn, Inst Polymer Sci & Engn, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Ctr Mol Sci, Beijing 100080, Peoples R China 3.New Jersey Inst Technol, Dept Chem, Newark, NJ 07102 USA 4.Polish Acad Sci, Ctr Polymer Chem, PL-41819 Zabrze, Poland |
| 推荐引用方式 GB/T 7714 | Xu, J,Guo, BH,Zhou, JJ,et al. Observation of banded spherulites in pure poly(L-lactide) and its miscible blends with amorphous polymers[J]. POLYMER,2005,46(21):9176-9185. |
| APA | Xu, J,Guo, BH,Zhou, JJ,Li, L,Wu, J,&Kowalczuk, M.(2005).Observation of banded spherulites in pure poly(L-lactide) and its miscible blends with amorphous polymers.POLYMER,46(21),9176-9185. |
| MLA | Xu, J,et al."Observation of banded spherulites in pure poly(L-lactide) and its miscible blends with amorphous polymers".POLYMER 46.21(2005):9176-9185. |
入库方式： OAI收割
来源：化学研究所
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