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首页> 外文期刊>Journal of Applied Polymer Science >Plasticization of cellulose diacetate by graft copolymerization of epsilon-caprolactone and lactic acid
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Plasticization of cellulose diacetate by graft copolymerization of epsilon-caprolactone and lactic acid

机译：ε-己内酯与乳酸的接枝共聚合对二乙酸纤维素的增塑作用

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Graft copolymerization of epsilon-caprolactone (CL) and lactic acid (LA) onto cellulose diacetate (CDA) at the residual hydroxyl positions was conducted to obtain thermoplastic CDA. The effects of the reaction temperature and time and the CL/LA molar ratio in the feed on the progress of the graft copolymerization were investigated. The molecular weight of CDA was increased by this graft copolymerization. The oxycaproyl and lactyl molar substitutions (MSCL and MSLA, respectively) in grafted CDA (g-CDA) were determined through H-1-NMR spectral analysis. These MS values were controllable by changing the reaction conditions adequately. The flow temperature and melt viscosity of g-CDA decreased with an increase in the total substitution of MSCL and MSLA, and transparent polymer sheets could be obtained from the resulting g-CDA by hot pressing at around 200degreesC without adding any plasticizer. The mechanical properties of the molded g-CDA samples varied widely, depending on the different combinations of the MSCL and MSLA values; the g-CDA sheets became elastic when the MSCL was larger than the MSLA, and their tensile strengths were enhanced as the MSLA was increased. It was thus found that CDA was successfully plasticized by this graft copolymerization. (C) 2002 Wiley Periodicals, Inc. [References: 16]
机译：进行ε-己内酯（CL）和乳酸（LA）在残余羟基位置上的纤维素二乙酸酯（CDA）上的接枝共聚以获得热塑性CDA。研究了反应温度和时间以及进料中CL / LA摩尔比对接枝共聚反应进度的影响。通过该接枝共聚增加了CDA的分子量。通过H-1-NMR光谱分析确定接枝的CDA（g-CDA）中的氧己酰基和乳酰基摩尔取代基（分别为MSCL和MSLA）。这些MS值可通过适当改变反应条件来控制。 g-CDA的流动温度和熔体粘度随着MSCL和MSLA的总取代量的增加而降低，并且可以通过在200摄氏度左右的热压下从所得g-CDA中获得透明聚合物片而无需添加任何增塑剂。模制的g-CDA样品的机械性能差异很大，具体取决于MSCL和MSLA值的不同组合;当MSCL大于MSLA时，g-CDA片材变得具有弹性，并且随着MSLA的增加，它们的拉伸强度也会提高。因此发现，通过接枝共聚成功地将CDA增塑。 （C）2002 Wiley Periodicals，Inc. [参考：16]

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