排序方式: 共有42条查询结果,搜索用时 15 毫秒
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红外光谱法研究交联淀粉的退化行为 总被引:4,自引:0,他引:4
用红外光谱研究了交联淀粉的退化过程, 结果表明, 交联淀粉具有与原淀粉大分子类似的退化过程, 即淀粉大分子临近的链段间形成双螺旋局部有序化结构, 再进一步规则地排列成结晶有序的结构. 由于交联键的限制, 交联淀粉的有序化过程相对较慢、 程度较低, 而且当交联度过高时无法形成结晶结构. 相似文献
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聚β-羟基丁酸酯/聚氧化乙烯共混体系力学性能研究 总被引:4,自引:0,他引:4
本文详细研究了可完全生物降解的聚 β 羟基丁酸酯 (PHB)与水溶性聚氧化乙烯 (PEO)两元共混体系的拉伸力学性能 .讨论了PEO分子量、共混组成及热处理条件对共混体系力学性能的影响 .其中 ,PHB与超高分子量PEO(重均分子量 5× 10 6)共混 ,两组分力学上具有相容性 ,共混物的拉伸强度、断裂伸长率及模量都有明显的正的协同效应 .共混改性效果显著PHB的力学性能得到很大改善 ,尤其PHB的脆性缺陷 .并且 ,共混物在经过适当温度退火处理之后 ,共混物性能还可进一步改善 相似文献
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淀粉和生物降解大分子间的半互穿聚合物网络的耐水性研究 总被引:2,自引:0,他引:2
以淀粉和可生物降解的PCL或PHBV等疏水性脂肪族聚酯为原料, 制备了淀粉基的Semi-IPN材料. 加入PCL或PHBV等疏水性大分子的使淀粉基Semi-IPN材料的耐水性能相对于原淀粉有很大的改善, 通过热处理和溶剂化作用能使Semi-IPN的耐水性进一步提高. 相似文献
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Blending isotactic polypropylene (PP) with ethylene-propylene terpolymer (EPT) is one of thesimplest and most effective ways for toughening PP. In order to further improve the toughness ofPP/EPT blend and to enhance the stability of the dispersed rubber phase, a diblock copolymer com-posed of PP and ethylene-propylene rubber blocks (PP-EPR) was added into the blend, as it is con-sidered that "forced compatibility" of the two components will be effected through the two chemi-cally bonded blocks, while two-phase structure still remains. Experimental results indicate that PP-EPR is an effective compatibilizer for PP/EPT blend. Itnot only increases the toughness of the blend, but also decreases the loss of tensile strengths usuallyaccompanying the toughening of plastics with an elastomer, which is very well explained by the mor-phological structure changes when an appropriate amount of PP-EPR was added into the blend. 相似文献