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首页> 外文期刊>Polymers for advanced technologies >Moisture-resistant and strength retention properties of supercritical CO2-processed thermoplastic starch modified by polyvinyl alcohol with varying degrees of polymerization
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Moisture-resistant and strength retention properties of supercritical CO2-processed thermoplastic starch modified by polyvinyl alcohol with varying degrees of polymerization

机译：通过不同聚合的聚乙烯醇改性超临界CO2加工热塑性淀粉的耐湿性和强度保持性能

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摘要

The ease of melt-processing, moisture-resistance, and tensile retention properties of scCO(2) and polyvinyl alcohol (PVA)-modified thermoplastic starch (scCO(2)TPS(x)PVA(y)(a)) materials were explored in this investigation. These characteristics were considerably improved by PVA modification particularly with decreasing PVA degree of polymerization (DP). The intensities of O-H stretching bands of scCO(2)TPS(x)PVA(y)(a) were considerably larger, and peak location of O-H stretching bands were significantly smaller than those of the corresponding TPS(x)PVA(y)(a) and reduced gradually with the decrease in PVA's DP. The Delta H of melting and diffraction peaks of V-h-type crystals for conditioned TPS(x)PVA(y)(a) and scCO(2)TPS(x)PVA(y)(a) were considerably smaller than those of corresponding TPS and TPS(x)PVA(y)(a) aged for the same time period and gradually reduced in intensity with decreasing PVA's DP. Possible reasons accounting for the considerably improved melt processing, moisture resistance, tensile retention, and retrogradation of scCO(2)TPS(x)PVA(y)(a) with decreasing PVA's DP are proposed.
机译：探讨了SCCO（2）和聚乙烯醇（PVA）制剂的热塑性碳酸（SCCO（2）TPS（X）PVA（A）（A）（A））材料的熔融加工，防潮性和拉伸保留性能在这次调查中。通过PVA改性，这些特征显着改善，特别是随着PVA的聚合度（DP）的降低。 SCCO（2）TPS（X）PVA（Y）（A）的OH拉伸带的强度相当大，oh拉伸带的峰值位置明显小于相应的TPS（x）pva（y）（ a）随着PVA的DP减少而逐渐减少。用于调节TPS（X）PVA（A）（A）（A）和SCCO（2）TPS（A）PVA（A）（A）（A）（A）的VH型晶体的熔融和衍射峰值显着小于相应的TPS和TPS（x）PVA（Y）（a）在同一时间段间，强度逐渐降低，PVA的DP降低。提出了可能的原因，提出了具有降低PVA的DP的SCCO（2）TPS（X）PVA（A）的显着改善的熔融加工，防潮，拉伸保留和逆转的熔体加工，防潮，拉伸保留和逆转。

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