Biodegradable and non-retrogradable eco-films based on starch-glycerol with citric acid as crosslinking agent
Biodegradable and non-retrogradable eco-films based on starch-glycerol with citric acid as crosslinking agent
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DOI：
10.1016/j.carbpol.2015.11.041
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发表时间：
2016-03-15
影响因子：
11.2
通讯作者：
Goyanes, Silvia
中科院分区：
文献类型：
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作者：
Gonzalez Seligra, Paula;Medina Jaramillo, Carolina;Goyanes, Silvia
使用柠檬酸（CA）作为交联剂，在75℃下获得了可生物降解和不可降解的淀粉-甘油基薄膜。该材料使水蒸气渗透性（WVP）降低了35%以上，由于CA形成的网络避免了淀粉的降解，并保持了堆肥中的可降解性，因此至少保持了45天的无定形，在没有柠檬酸的情况下仅发生了6天。用差热分析装置模拟了添加和不添加CA的淀粉-甘油糊化过程，结果表明，添加CA的体系比不添加CA的体系早5℃完成糊化，CA先与甘油反应，然后发生淀粉-甘油-CA反应。进行糊化过程的温度是获得最佳结果的关键。与在75℃下处理的薄膜相比，在含有CA的体系中，在85℃下增加糊化过程温度，导致用二甲基亚砜（DMSO）进行膨胀过程后的WVP及其完整性恶化。版权所有。
Biodegradable and non-retrogradable starch-glycerol based films were obtained using citric acid (CA) as crosslinking agent at 75 degrees C. This material allowed decreasing water vapor permeability (WVP) more than 35%, remained amorphous for at least 45 days as a result of the network formed by the CA that avoided starch retrogradation and maintained the degradability in compost, occurring only six days after the films without citric acid. A simulation of the gelatinization process of starch-glycerol with and without CA, using a differential thermal analysis device, showed that the system with CA completed the gelatinization 5 degrees C before than the other and, CA first reacted with glycerol and then starch-glycerol-CA reaction occurred. The temperature at which the gelatinization process was carried out was critical to obtain the best results. An increase of gelatinization process temperature at 85 degrees C in system with CA, led to a worsening on WVP and its integrity after a swelling process with dimethylsulphoxide (DMSO), compared to the films processed at 75 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.