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。本研究的主要结果如下：1.通过溶液凝聚法制备的纤维素/合成聚合物共混物：通过在非溶剂中凝聚，从N，N-二甲基乙酰胺（DMAc）-氯化锂（LiCl）中的混合聚合物溶液制备纤维素（CELL）与聚（环氧乙烷）（PEO）的共混膜。采用DSC热分析研究了共混物中PEO组分的熔融结晶行为。据观察，添加CELL到PEO中引起PEO结晶速率的显著降低。对于CELL/PEO体系，还注意到拉伸性能的几种协同改进。此外，还对在较宽的组成范围内获得的CELL/尼龙6和CELL/聚ε-己内酯共混物进行了相表征， ...更多信息 在DMAc-LiCl中的溶液。通过溶液凝聚/本体聚合方法制备的纤维素/合成聚合物复合材料：纤维素/聚（甲基丙烯酸2-羟乙酯）（CELL/PHEMA）复合材料由纤维素在DMAc-LiCl中的溶液通过用乙烯基溶剂HEMA凝聚和随后的所得凝胶状膜的本体聚合来制备。结果发现，一个原始的结构的“作为凝固”纤维素凝胶成功地永久化到PHEMA矩阵，同时，一个“IPN”型组织的结果。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的表征.纤维素共混物组成的多相，包括一个介晶有序相：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进行了研究。结果，完成了相图的构建。提出了合成多组分高分子材料的建议，该材料由多个相组成，其中至少包括一个纤维素衍生物的介晶有序相.其他：针对上述研究课题1，研究了硝化纤维素/脂肪族聚酯和聚乙烯醇/聚乙烯吡咯烷酮的混溶共混物的热转变行为和分子间相互作用。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