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首页> 外文期刊>Journal of Applied Polymer Science >Grafting biodegradable polyesters onto cellulose
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Grafting biodegradable polyesters onto cellulose

机译：将可生物降解的聚酯接枝到纤维素上

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摘要

To increase the compatibility between cellulose fibers and polyester matrix an original method for grafting hydrophobic oligoesters onto cellulose was proposed. Two kinds of cellulose substrates were employed as cellulose films and microcrystalline cellulose powder. Different oligoesters containing reactive end groups based on poly(DL-lactic acid) PDL-LA, poly(ε-caprolactone) PCL and poly(3-hydroxyalkanoate)s PHA were first prepared and characterized by size exclusion chromatography (SEC), nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC). The carboxylic end groups of the polyesters were activated using thionyl chloride (SOCl_2) to increase the esterification reaction with the hydroxyl groups of the cellulose. The esterification was realized in a heterogenous medium without any catalyst by deposition of chloride oligoesters in solution (2-100 g L-1) onto cellulose film at different temperatures (25-105°C) during 1-12 h. The successful grafting on the various substrates was confirmed on the basis of FTIR spectroscopy, contact angle measurement, X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). In particular, it is shown that a small quantity of grafted oligoesters led to a significant increase of the hydrophobic character of the cellulose with a contact angle near 130°. The increase of hydrophobicity of cellulose is independent of the nature and length of grafting oligoesters.
机译：为了增加纤维素纤维和聚酯基质之间的相容性，提出了将疏水性低聚酯接枝到纤维素上的原始方法。两种纤维素基质被用作纤维素膜和微晶纤维素粉末。首先制备了基于聚（DL-乳酸）PDL-LA，聚（ε-己内酯）PCL和聚（3-羟基链烷酸酯）PHA的含反应性端基的不同低聚酯，并通过尺寸排阻色谱法（SEC），核磁法进行了表征共振（NMR）和差示扫描量热法（DSC）。用亚硫酰氯（SOCl_2）活化聚酯的羧基端基，以增加与纤维素的羟基的酯化反应。通过在1-12小时内于不同温度（25-105°C）下将溶液（2-100 g L-1）中的氯化物低聚酯沉积到纤维素膜上，在没有任何催化剂的非均相介质中实现酯化。基于FTIR光谱，接触角测量，X射线光电子能谱（XPS）和热重分析（TGA），证实了在各种基材上的成功接枝。特别地，显示出少量的接枝的低聚酯导致接触角接近130°时纤维素的疏水性显着增加。纤维素疏水性的增加与接枝低聚酯的性质和长度无关。

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