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以甘油和尿素作为混合塑化剂、废纸浆为增强体,玉米淀粉、聚乙烯醇为基体,利用熔融共混法制备了废纸浆增强玉米淀粉复合材料。研究了混合增塑剂、废纸浆、水含量、氢氧化钠浓度对复合材料力学性能的影响。力学性能测试结果表明,甘油和尿素混合塑化剂对复合材料有反增塑作用,当甘油/尿素含量分别为10/20份时,拉伸强度最佳为10.26MPa;氢氧化钠浓度为4%时,复合材料综合力学性能最好;废纸浆对复合材料有增强作用,当含量为35份时,拉伸强度最佳为11.35MPa;随着含水率的增加,材料的拉伸强度降低,断裂伸长率先增加后降低;扫描电镜观察发现,甘油和尿素混合塑化剂能够增塑淀粉,很好的改善废纸浆和玉米淀粉之间的相容性。
Using glycerol and urea as mixed plasticizer, waste paper pulp as reinforcement, corn starch and polyvinyl alcohol as matrix, the waste paper pulp reinforced corn starch composites were prepared by melt blending method. The effects of mixed plasticizer, waste paper pulp, water content and sodium hydroxide concentration on the mechanical properties of the composites were studied. Mechanical properties of the test results show that glycerol and urea mixed plasticizer antiplastic compound antiplastic effect, when the glycerol / urea content were 10/20 copies, the best tensile strength of 10.26MPa; sodium hydroxide concentration of 4 %, The mechanical properties of the composites are the best; the waste paper pulp has a reinforcing effect on the composites, the best tensile strength is 11.35MPa when the content is 35 parts; the tensile strength of the material decreases with the increase of the water content, Elongation at break increased first and then decreased. Scanning electron microscopy showed that glycerol and urea mixed plasticizer could plasticize starch, which could well improve the compatibility between waste pulp and corn starch.