Biodegradable Poly(L-lactide)/Polyhedral Oligomeric Silsesquioxanes Nanocomposites: Enhanced Crystallization, Mechanical Properties, and Hydrolytic Degradation
Biodegradable Poly(L-lactide)/Polyhedral Oligomeric Silsesquioxanes Nanocomposites: Enhanced Crystallization, Mechanical Properties, and Hydrolytic Degradation
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DOI：
10.1021/ma9023685
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发表时间：
2010-02-09
期刊：
影响因子：
5.5
通讯作者：
Qiu, Zhaobin
中科院分区：
文献类型：
--
作者：
Pan, Hong;Qiu, Zhaobin
为了使 POSS 在 PLLA 基质中更好地分散，本工作通过溶液法和混凝法在不同的 POSS 负载量下制备了可生物降解的聚（L-丙交酯）（PLLA）/多面体低聚倍半硅氧烷（POSS）纳米复合材料。扫描电镜观察表明POSS很好地分散在PLLA基质中。 PLLA/POSS 纳米复合材料的总体结晶速率比纯 PLLA 更快，并且随着 POSS 负载量的增加而增加；然而，尽管POSS存在，PLLA的结晶机制和晶体结构保持不变。与纯 PLLA 相比，PLLA/POSS 纳米复合材料的储能模量明显提高，而纯 PLLA 和 PLLA/POSS 纳米复合材料之间的玻璃化转变温度略有不同。有趣的是发现PLLA/POSS纳米复合材料的水解降解率比纯PLLA明显提高，这对于PLLA更广泛的实际应用可能具有很大的用途和重要性。进一步讨论了纯 PLLA 和 PLLA/POSS 纳米复合材料的侵蚀机理。
Biodegradable poly(L-lactide) (PLLA)/polyhedral oligomeric silsesquioxanes (POSS) nano-composites were prepared in this work via solution and coagulation method at various POSS loading in order to get a better dispersion of POSS in the PLLA matrix. Scanning electron microscopy observation indicates that POSS were nicely dispersed in the PLLA matrix. The overall crystallization rates are faster in the PLLA/POSS nanocomposites than in neat PLLA and increase with increasing the POSS loading; however, the crystallization mechanism and crystal structure of PLLA remain unchanged despite the presence of POSS. The storage modulus has been apparently improved in the PLLA/POSS nanocomposites with respect to neat PLLA, while the glass transition temperatures vary slightly between neat PLLA and the PLLA/POSS nanocomposites. It is interesting to find that the hydrolytic degradation rates have been enhanced obviously in the PLLA/POSS nanocomposites than in neat PLLA, which may be of great use and importance for the wider practical application of PLLA. The erosion mechanism of neat PLLA and the PLLA/POSS nanocomposites was further discussed.