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首页> 外文期刊>Polymer Degradation and Stability >A new poly(L-lactide)-grafted graphite oxide composite: Facile synthesis, electrical properties and crystallization behaviors
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A new poly(L-lactide)-grafted graphite oxide composite: Facile synthesis, electrical properties and crystallization behaviors

机译：一种新型的聚（L-丙交酯）接枝的氧化石墨复合材料：易于合成，电性能和结晶行为

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摘要

A simple method was adopted to prepare poly(L-lactide)-grafted graphite oxide (PLLA-g-GO) by ring opening polymerization of L-lactide in the presence of graphite oxide (GO) with hydroxyl groups. GO was firstly treated with tolylene-2,4-diisocyanate (TDI) to create an anchor site on GO, and then reacted with 1,4-butanediol (BD) to afford functional hydroxyl groups grafted onto the surface of GO. So that, the dispersity of GO in the organic solution was enhanced. According to the thermogravimetric analysis (TGA), the organic composition of GO treated with TDI and BD (GO-TDI-OH) was estimated to be about 13 wt%. Also, using TGA, the composition of GO in the PLLA-g-GOs could be estimated. The hydroxyl groups on the GO surface acted as initiators for the ROP of L-lactide. Further, they also played as a vital role in controlling the molecular weight of the PLLA. The synthesized PLLA-g-GOs were characterized by the FTIR, ~1HNMR and UV/Vis spectroscopies. The dispersion states of GO in the PLLA-g-GOs were investigated by wide angle x-ray diffraction patterns. According to differential scanning calorimeter study, it was found that GO platelets have nucleating effect on the crystallization of PLLA in the PLLA-g-GO. Additionally, the incorporation of GO improved the electrical conductivity of PLLA, indicating that GOs is a good conducting-modifiers for polymers.
机译：采用一种简单的方法，在具有羟基的氧化石墨（GO）存在下，通过L-丙交酯的开环聚合反应来制备聚（L-丙交酯）接枝的氧化石墨（PLLA-g-GO）。首先用甲苯2,4-二异氰酸酯（TDI）处理GO，以在GO上生成锚定位点，然后与1,4-丁二醇（BD）反应，得到接枝到GO表面的官能羟基。因此，提高了GO在有机溶液中的分散性。根据热重分析（TGA），用TDI和BD处理的GO的有机组成（GO-TDI-OH）估计为约13重量％。同样，使用TGA，可以估计PLLA-g-GO中GO的组成。 GO表面上的羟基充当L-丙交酯的ROP的引发剂。此外，它们在控制PLLA的分子量方面也起着至关重要的作用。通过FTIR，〜1HNMR和UV / Vis光谱对合成的PLLA-g-GOs进行表征。通过广角X射线衍射图谱研究了GO在PLLA-g-GO中的分散状态。根据差示扫描量热仪研究，发现GO血小板对PLLA-g-GO中PLLA的结晶具有成核作用。另外，GO的引入改善了PLLA的电导率，表明GO是聚合物的良好导电改性剂。

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