Structure and properties of glycerol-plasticized chitosan obtained by mechanical kneading
Structure and properties of glycerol-plasticized chitosan obtained by mechanical kneading
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DOI：
10.1016/j.carbpol.2010.09.003
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发表时间：
2011-01-10
影响因子：
11.2
通讯作者：
Averous, Luc
中科院分区：
文献类型：
--
作者：
Epure, Virginia;Griffon, Marie;Averous, Luc
本文报道了用热机械处理的方法制备可替代溶剂浇注的增塑壳聚糖，并用甘油作为增塑剂，浓度固定为25wt%。研究了在不同相对湿度的后处理老化过程中吸水率、结晶度的变化、力学性能和动态机械热性能。比较了增塑壳聚糖和不含甘油的壳聚糖的性能，如与大多数增塑多糖一样，增塑壳聚糖可提高材料的断裂伸长率(+40%)。材料性能受水分含量的影响很大。吸水率测量表明，增塑壳聚糖提高了材料的亲水性。添加甘油拉伸测试和DMTA结果证实了甘油和水的塑化效果。分析证明，需要几个星期的控制储存才能达到稳定的性能。在中等相对湿度的大气(57%RH)(C)2010爱思唯尔有限公司获得了最好的结果。
This paper reports the elaboration of plasticized chitosan by thermo-mechanical treatment as a possible alternative route to solvent casting and the corresponding material properties Glycerol was used as plasticizer with a concentration fixed at 25 wt % The water uptake crystallinity evolution mechanical and dynamic-mechanical thermal properties were studied during the post-processing ageing at different relative humidities The properties of plasticized chitosan were compared with those of glycerol-free samples For instance increased elongation at break (+40%) is observed with plasticized chitosan Like most plasticized polysaccharides the material properties are strongly impacted by water content The water uptake measurements evidenced that the hydrophilic character of the material is enhanced by the addition of glycerol Both tensile tests and DMTA results confirm the plasticizing effect of glycerol and water The analyses evidenced that several weeks of controlled storage are required to reach stabilized properties The best results are obtained for materials stabilized in a medium relative humidity atmosphere (57% RH) (C) 2010 Elsevier Ltd All rights reserved