Influence of clay content on the melting behavior and crystal structure of nonisothermal crystallized poly(L‐lactic acid)/nanocomposites
Influence of clay content on the melting behavior and crystal structure of nonisothermal crystallized poly(L‐lactic acid)/nanocomposites
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粘土含量对非等温结晶聚(L-乳酸)/纳米复合材料熔融行为和晶体结构的影响
DOI：
10.1002/app.35165
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发表时间：
2012
影响因子：
3
通讯作者：
E. Nedkov
中科院分区：
文献类型：
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作者：
F. Ublekov;J. Baldrián;J. Kratochvíl;M. Steinhart;E. Nedkov
为了研究亲有机粘土浓度对非等温结晶的影响，通过混合不同量的商业MMT（Cloadeni 30 B）和聚（L-乳酸）（PLLA）来制备聚（L-乳酸）/蒙脱土（MMT）纳米复合材料。通过差示扫描量热法（DSC）、小角X射线散射和广角X射线衍射（XRD）分析，研究了MMT含量对非等温结晶PLLA/MMT纳米复合材料熔融行为和晶体结构的影响。研究了填料浓度对PLLA/MMT非等温结晶纳米复合材料的热性能和结构性能的影响。所获得的结果表明，在填料负载高于3wt%时，观察到粘土的插层。在较低的粘土浓度（1-3重量%）下，剥落占主导地位。DSC和XRD分析结果表明，在粘土含量较高（5- 9wt%）时，PLLA/MMT复合材料的结晶度显著提高。在这些纳米复合材料中，PLLA以正交晶体结构非等温结晶，归属于PLLA的α形式。© 2011 Wiley Periodicals，Inc.应用聚合物科学杂志，2012年
To study the effect of organophilic clay concentration on nonisothermal crystallization, poly(L-lactic acid) (PLLA)/montmorillonite (MMT) nanocomposites were prepared by mixing various amounts of commercial MMT (Cloisite® 30B) and PLLA. The effect of MMT content on melting behavior and crystal structure of nonisothermal crystallized PLLA/MMT nanocomposites was investigated by differential scanning calorimetry (DSC), small-angle X-ray scattering, and wide-angle X-ray diffraction (XRD) analyses. The study was focused on the effect of the filler concentration on thermal and structural properties of the nonisothermally crystallized nanocomposite PLLA/MMT. The results obtained have shown that at filler loadings higher than 3 wt %, intercalation of the clay is observed. At lower clay concentrations (1–3 wt %), exfoliation predominates. DSC and XRD analysis data show that the crystallinity of PLLA/MMT composites increases drastically at high clay loadings (5–9 wt %). In these nanocomposites, PLLA crystallizes nonisothermally in an orthorhombic crystal structure, assigned to the α form of PLLA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
N.佐藤：J.化学。
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