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首页> 外文期刊>Journal of Applied Polymer Science >New methods for acylation of pure and sawdust-extracted cellulose by fatty acid derivatives - Thermal and mechanical analyses of cellulose-based plastic films
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New methods for acylation of pure and sawdust-extracted cellulose by fatty acid derivatives - Thermal and mechanical analyses of cellulose-based plastic films

机译：用脂肪酸衍生物酰化纯净和锯末提取的纤维素的新方法-纤维素塑料薄膜的热力学和机械分析

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摘要

This work deals with the synthesis of cellulosic plastic films obtained in homogeneous conditions by microwave-induced acylation of commercial or chestnut tree sawdust cellulose by fatty acids. The acylation reaction was studied according to N,N-dimethyl-4-aminopyridine (DMAP) amount, DMAP simultaneously playing the role of catalyst and proton trapping base. This study clearly showed that DMAP does not influence degrees of substitution (DS), massic, and molar yields. Plastic films synthesized in the absence of DMAP showed a decrease in mechanical behavior. Organic (tributylamine) or inorganic bases (CaCO3, Na2CO3) were then added to replace DMAP basic activity, and no changes were observed. Concerning thermal and mechanical properties of plastics obtained with various bases, glass transition temperatures (T-g) and degradation temperature (T-d) were found constant whatever the base, and the best mechanical properties were obtained for films synthesized in the presence of CaCO3. The same remarks were made concerning the valorization of chestnut tree sawdust cellulose. Microbial biodegradation of plastic films with DS = 2.2 led to a loss of their mechanical behaviors. (c) 2005 Wiley Periodicals, Inc.
机译：这项工作涉及在同质条件下通过脂肪酸诱导的商业或板栗树屑木屑纤维素的微波诱导酰化反应获得的纤维素塑料薄膜的合成。根据N，N-二甲基-4-氨基吡啶（DMAP）的用量研究了酰化反应，同时DMAP同时起着催化剂和质子俘获碱的作用。这项研究清楚地表明，DMAP不会影响取代度（DS），质量和摩尔产率。在没有DMAP的情况下合成的塑料薄膜显示出机械性能的下降。然后添加有机（三丁胺）或无机碱（CaCO3，Na2CO3）来代替DMAP基本活性，但未观察到变化。关于用各种碱制得的塑料的热和机械性能，发现无论用哪种碱，玻璃化转变温度（T-g）和降解温度（T-d）都是恒定的，对于在CaCO3存在下合成的薄膜，其机械性能最佳。关于板栗木屑纤维素的增值，也有相同的评论。 DS = 2.2的塑料薄膜的微生物生物降解导致其机械性能丧失。 （c）2005年Wiley Periodicals，Inc.

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