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首页> 外文期刊>Polymer Composites >In Situ Intercalation Green Polymerization, Characterization, and Kinetics of Poly(lactic acid)/Zinc Oxide Pillared Saponite Nanocomposites
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In Situ Intercalation Green Polymerization, Characterization, and Kinetics of Poly(lactic acid)/Zinc Oxide Pillared Saponite Nanocomposites

机译：聚乳酸/氧化锌柱撑皂石纳米复合材料的原位插层绿色聚合，表征及动力学

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摘要

Poly(lactic acid) (PLA)/Zinc oxide (ZnO) pillared saponite nanocomposites were prepared with ZnO pillared saponite as the green catalyst and lactic acid as monomer through in situ intercalation polymerization method. The optimum polymerization parameters were as follows the addition content of ZnO pillared saponite was 1% (wt) and the reaction was running at 180C for 7 h. The Fourier transform infrared and ~1H NMR results showed that the polymerization sample was PLA; Gel permeation chromatography result showed the PLA had a narrow molecular weight distribution, which arranged from 3,000 to 5,000 and the polydispersity index of PLA was 1.2. Differential scanning calorimetry showed ZnO pillared saponite improved the crystallinity of PLA. Ther-mogravimetric analysis showed the thermal stability of PLA-based nanocomposites were improved by ZnO pillared saponite. It was shown that in situ intercalative polymerization kinetics model of PLA/ZnO pillared saponite nanocomposites accorded with third order, and the activation energy of polymerization reaction was 49.3 kJ/mol under the polymerization reaction conditions as follows: the vacuum degree was 0.085 MPa, the temperature was 130C, and the reaction extent was 2.35～47.69%, the content of ZnO pillared saponite catalyst was 1 wt%.
机译：通过原位插层聚合法，以ZnO为柱状皂石为绿色催化剂，乳酸为单体，制备了聚乳酸（PLA）/氧化锌（ZnO）柱状皂石纳米复合材料。最佳的聚合参数如下：ZnO柱撑皂石的添加量为1％（重量），反应在180℃进行7小时。傅里叶变换红外光谱和〜1H NMR结果表明，聚合样品为PLA。凝胶渗透色谱分析结果表明，PLA的分子量分布较窄，在3,000至5,000范围内，PLA的多分散指数为1.2。差示扫描量热法显示ZnO柱状皂石改善了PLA的结晶度。热重分析表明，ZnO柱撑皂石改善了PLA基纳米复合材料的热稳定性。结果表明，PLA / ZnO柱撑皂石纳米复合材料的原位插层聚合动力学模型符合三阶条件，在真空度为0.085 MPa，真空度为0.085 MPa的条件下，聚合反应的活化能为49.3 kJ / mol。温度为130℃，反应程度为2.35〜47.69％，ZnO柱撑皂石催化剂的含量为1wt％。

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