Preparation and Evaluation of Biodegradable Polymers Derived from Woody Components

Shraishi和Yoshioka研究了醋酸纤维素和乙酰化木材与反应性增塑剂的捏合反应，并与非反应性增塑剂同时使用。他们还研究了在苯酚或多元醇存在下木材的液化，它在模塑中的应用，以及对木材液化的解释。Takemura报道了聚甲基丙烯酸甲酯/纤维素共混体系的研究结果，并对几种醋酸纤维与聚合物的共混体系进行了研究。小林合成了一种新型的多糖与聚谷氨酸(L-谷氨酸)的偶联物，该偶联物可以被蛋白酶降解。Tomita认为，由于臭氧氧化木质素具有麦康酸衍生物的结构，因此可以开发出可生物降解的聚合物。基于这一想法，他进行了各种树脂化试验，并成功地开发出了木质素/环氧树脂。酒井以树皮单宁为原料合成聚氨酯泡沫塑料并成功开发…更多具有优异物理性能和生物降解性的材料。西田发现了一种评价富田制备的臭氧氧化木质素的生物降解性的方法。他还获得了聚乙烯片的生物降解证据，聚乙烯片被认为是一种不可生物降解的材料，经过白腐菌处理后，可以高度降解木质素。经真菌处理后，聚乙烯板材的力学性能发生了较大的变化。Shimada和Takahashi研究了Shraishi和Yoshioka制备的寡酯化纤维素醋酸酯的生物降解性和乙酰化木材的生物降解性，发现两者都具有足够的生物降解性，可以被认为是自然环境友好材料。黑田使用了不同丁香基和愈创木基比的硬木型脱氢聚合材料作为木质素样品，并表明热解-气相色谱分析可以有效地跟踪木质素在衰退和脱木素过程中化学结构的变化。较少

Shiraishi and Yoshioka were studied kneading reaction of cellulose acetate and acetylated wood with reactive plasticizers and simultaneous use of those and non-reactive one. They also studied the liquefaction of wood in the presence of phenol or polyhydric alcohols, its application to moldings and elucidation of liquefaction of wood. Takemura reported the studying results on compatibility of polymethyl methacrylate/cellulose blends, and studied also several blending systems of cellulose acetate and polymers. Kobayashi synthesized novel conjugates between polysaccharides and poly (L-glutamic acid), which can be degraded by proteinase. Tomita considered that biodegradable polymers can be developed from ozone oxidized lignin because the oxidized lignin takes the structure of muconic acid derivatives. Based on this idea, he did various resinification trials and succeeded in developing lignin/epoxy resins. Sakai synthesized polyurethane foams from bark tannin and succeeded in developing the … More materials with excellent physical properties and biodegradabilities. Nishida found a methodin evaluating the biodegradability of ozone oxidized lignin which Tomita prepared. He also got a proof of biodegradation of polyethylene sheets which has been considered as a non-biodegradable materials, after treatment with white rot fungi which can highly degrade lignin. The mechanical properties of the polyethylene sheet varied considerably after the fungi treatment. Shimada and Takahashi studied the biodegradability of oligoesterified cellulose acetates, which Shiraishi and Yoshioka prepared, and that of acetylated wood, and found that both of them were sufficiently biodegradable and could be considered as natural circumstance friendly materials. Kuroda used hard-woodtype dehydrogenation polymerized materials which have various syringyl to guaiacyl ratios as lignin samples and showed that changes in the chemical structure of lignin during its decay and delignification processes can be effectively pursued by a pyrolysis-gas chromatography analysis. Less