生物塑料聚(3HB-co-4HB)/玉米淀粉共混材料的制备与性能  

Preparation and Properties of Biopolymer P(3HB-co-4HB)/Cornstarch Blending Materials

作　　者：张竞[1] 卢秀萍[1] 任翔宇[1] 温幸[1] 

机构地区：[1]天津科技大学材料科学与化学工程学院,天津300457

出　　处：《天津科技大学学报》2010年第2期34-37,共4页Journal of Tianjin University of Science & Technology

摘　　要：以聚4–羟基丁酸酯摩尔分数为7.3%的聚(3–羟基丁酸酯–co–4–羟基丁酸酯)和玉米淀粉为原料,通过挤出熔融共混和注塑成型制备了P(3HB-co-4HB)/玉米淀粉共混材料.借用差示扫描量热仪(DSC)、热失重分析仪(TGA)和电子拉力机等考察了玉米淀粉含量对共混材料熔点、结晶度、热分解温度、耐水性及力学性能的影响.结果表明:随玉米淀粉含量增加,共混体系的结晶度减小,熔融温度降低,熔限变宽且出现明显的双峰;玉米淀粉含量为30份的共混材料热分解温度较纯P(3HB-co-4HB)-7.3略有降低,缺口冲击强度和断裂伸长率分别在淀粉含量为10份和20份达最佳,其值分别为4.95.kJ/m2和33.15%,较纯P(3HB-co-4HB)-7.3分别提高14.3%和147.76%.拉伸强度和弯曲强度则随玉米淀粉含量增加逐渐下降.Poly（3-hydroxylbutyrate-co-4-hydroxylbutyrate）with 7.3% 4HB and cornstarch were selected as raw materials to prepare P（3HB-co-4HB）/cornstarch blending materials by melting mixing and injection molding. The influences of corn starch content on the melting point,crystallinity,thermal decomposition temperature ,water resistance and mechanical properties of the blending materials were characterized by DSC,TGA and tensile measurements. The results show that with the increase of cornstarch dosage,the crystallinity and melting temperature of the blend decrease,the melting temperature range is enlarged and double peaks appeared. The thermal decomposition temperature of the blend with 30 phr cornstrach decreased slightly than that of pure P（3HB-co-4HB）-7.3. The notched impact strength and break elongation of the blend were optimum at 10 phr and 20 phr cornstrach content,which are 4.95 kJ/m^2 and 33.15% respectively. Compared with pure P（3HB-co- 4HB）-7.3 ,the optimum values of notched impact strength and break elongation are higher 14.3% and 147.76%. The tensile strength and bending strength of the blends decrease gradually with increase of cornstarch.

关 键 词：聚(3-羟基丁酸酯-co-4-羟基丁酸酯) 玉米淀粉 熔融共混 结晶 力学性能 

分 类 号：TQ317.9[化学工程—高聚物工业]