Fundamental Research on Polymer Complex using Chitosan

本研究的目的是利用一种新的合成方法，将地球上利用率较低的生物质甲壳素或壳聚糖转化为具有良好力学性能的复合高分子材料。程序如下：将壳聚糖溶解于丙烯酸单体中，加入引发剂，UV固化制得聚合物配合物。从壳聚糖在不同浓度的丙烯酸水溶液单体中的溶解度试验可知，壳聚糖在丙烯酸水溶液单体中的溶解度可达合成聚合物固含量的20%。将上述不同浓度的壳聚糖/丙烯酸单体/水溶液加入水溶性引发剂，然后进行紫外辐射聚合。已知聚合物配合物的性质和形态多种多样，从硬到软、粘，溶胀程度由高到低。壳聚糖在水中的最大溶胀率为20，用少量脱乙酰甲壳素制备的壳聚糖可以提高溶胀率，降低表观交联密度。从拉曼光谱上看，随着壳聚糖用量的增加，羰基的吸光度波数随之增加，表明壳聚糖与聚丙烯酸之间存在较强的相互作用。含水膨胀膜的羰基拉曼光谱发生高波数偏移并变得尖锐，表明膨胀时氢键被切断。DSC热像图显示，随着壳聚糖用量的增加，聚丙烯酸的玻璃化转变温度逐渐升高，表明聚丙烯酸与壳聚糖具有良好的相容性。

The purpose of this work is to convert chitin or chitosan, which are low-utilizable biomass on the earth, into composite polymeric materials having satisfactory mechanical properties using a new synthetic method. The procedure is as follows ; dissolving chitosan into aqueous acrylic acid monomer, adding initiator, then UV curing to prepare polymer complex.From the solubility test of chitosan into various concentration of aqueous aclyric acid monomer, it was known that chitosan can be dissolved into aqueous aclyric acid monomerupto 20% of solid content of synthesized polymer.The above various concentrations of chitosan/acrylic acid monomer/water solution were polymerized by adding water soluble initiator and then UV radiation. It was known that various properties and forms of polymer complex can be produced, of which forms were from hard to soft and tacky, of which swelling were high to low. The maximum swelling in water was 20, which can be greater using chitosan from limited deacetylated chitin in order to lower apparent cross linking density. From raman spectroscopy, the absorbance derived from carbonyl groups shifted higher wave number with the increase of chitosan, which indicated strong interaction between chitosan and polyacrylic acid. The raman spectra of carbonyl for swollen films with water was shifted higher wave number and became sharp, which indicated the hydrogen bond was cut whtn swelled.From DSC thermography, the glass transition temperature of polyacrylic acid became higher with the increase of chitosan, which indicated good compatibility between polyacrylic acid and chitosan.