Preparation and Characterization of New Types of Cellulosic Blends and Composites with Synthetic Polymers

本研究旨在为新型纤维素基聚合物共混物和复合材料的设计和制备提供一些有益的建议。一系列研究的主要成果总结如下：1.溶液凝聚法制备纤维素/合成聚合物共混物：在N，N-二甲基乙酰胺(DMAc)-氯化锂(LiCl2)的混合聚合物溶液中，用非溶剂凝聚法制备了纤维素(细胞)与聚氧乙烯(PEO)共混膜。用DSC热分析法研究了共混物中PEO组分的熔融结晶行为。结果表明，电池的加入显著降低了PEO的结晶速度。CELL/PEO体系的拉伸性能也有几处协同改善。此外，还对从SO-…获得的宽组成范围内的CELL/尼龙6和CELL/聚(己内酯)共混物进行了物相表征在DMAc-LiCl2中有更多的精华。溶液凝聚/本体聚合法制备纤维素/合成聚合物复合材料：以纤维素在DMAc-LiCl中的溶液为原料，用乙烯基溶剂HEMA进行凝聚，然后进行本体聚合，制备了纤维素/聚(甲基丙烯酸羟乙酯)(CELL/PHEMA)复合材料。研究发现，凝聚的纤维素凝胶的原始结构被成功地保存到PHEMA基质中，同时，产生了一种IPN类型的组织。采用溶液凝聚/本体聚合法制备了纤维素/聚甲基丙烯酸缩水甘油酯复合材料，并对其进行了热性能和力学性能表征。研究了乙基纤维素、羟丙基纤维素和丙烯酸的二元和三元混合物的光学性质和相行为。结果，完成了相图的构建。还提出了合成由多相组成的多组分聚合物材料的建议，其中包括至少一个纤维素衍生物的介晶有序相。其他：关于上面列出的研究主题1，研究了硝基纤维素/脂肪族聚酯和聚乙烯醇/聚乙烯吡咯烷酮的可混溶共混物的热转变行为和分子间相互作用。较少

In this research project, we intended to give a lot of useful suggestions for the design and fabrication of new types of cellulose-based polymer blends and composites. The major results of a series of studies are summarized as follows.1. Cellulose/synthetic-polymer blends prepared by a solution coagulation method : Blend films of cellulose (CELL) with poly (ethylene oxide) (PEO) were prepared from mixed polymer solutions in N, N-dimethylacetamide (DMAc) - lithium chloride (LiC1) by coagulation in a nonsolvent. The melt-crystallization behavior of the PEO component in the binary blends was investigated by DSC thermal analysis. It was observed that the addition of CELL to PEO caused a marked decrease in the rate of the PEO crystallization. Several synergistic improvements in tensile properties were also noted for the CELL/PEO system. In addition, phase characterization was conducted for CELL/nylon 6 and CELL/poly(epsilon-caprolactone) blends obtained over a wide composition range from so … More lutions in DMAc-LiCl.2. Cellulose/synthetic-polymer composites prepared by a solution coagulation/bulk polymerization method : Cellulose/poly(2-hydroxyethyl methacrylate) (CELL/PHEMA) composites were prepared from solutions of cellulose in DMAc-LiCl by coagulation with a vinyl solvent HEMA and subsequent bulk polymerization of the resulting gelatinous films. It was found that an original structure of 'as-coagulated' cellulose gels was successfully perpetuated into the PHEMA matrix and, concurrently, an 'IPN'-type organization resulted. Cellulose/poly(glycidyl methacrylate) composites could also be obtained according to the 'solution coagulation/bulk polymerization' method and the thermal and mechanical characterization was carried out.3. Cellulosic blends composed of multiphases including a mesomorphic ordered phase : Optical properties and phase behavior of the binary and ternary mixtures of ethyl cellulose, hydroxypropyl cellulose, and acrylic acid were investigated. As a result, construction of a phase diagram was completed. A suggestion was also presented for the synthesis of multicomponent polymeric materials composed of multiple phases including at least one mesomorphic ordered phase of a cellulose derivative.4. Others : In relation to the research subject 1 itemized above, the thermal transition behavior and intermolecular interactions were examined for miscible blends of nitrocellulose/aliphatic polyesters and poly (vinyl alcohol) / poly (vinyl pyrrolidone). Less