Effect of silver nitrate on the thermal processability of poly(vinyl alcohol) modified by water.
Effect of silver nitrate on the thermal processability of poly(vinyl alcohol) modified by water.
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硝酸银对水改性聚乙烯醇热加工性能的影响
DOI：
10.1039/c7ra12941f
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发表时间：
2018-01-09
期刊：
影响因子：
3.9
通讯作者：
Li, Wenzhi
中科院分区：
文献类型：
--
作者：
Liu, Qing;Chen, Ning;Bai, Shibing;Li, Wenzhi
聚乙烯醇（PVA）的热加工是一个世界性的难题。为了进一步改善聚乙烯醇（PVA）/水体系的热加工性能，引入了能与PVA和水的羟基联合收割机结合的银银（AgNO 3）。研究了硝酸银改性聚乙烯醇（PVA）的水状态、热性能和流变性能。结果表明，随着AgNO 3含量的增加，由于PVA、水和AgNO 3之间的相互作用，体系中结合水的含量增加，说明PVA基体对水的束缚作用增强，从而延缓了体系中水在熔融过程中的剧烈蒸发，使更多的水留在体系中发挥增塑剂的作用。同时，AgNO 3与PVA的羟基结合，进一步削弱了PVA的自氢键，保证了PVA的熔点降低和分解温度提高，拓宽了热加工窗口。改性PVA体系的流变性能表明，在熔融加工过程中，改性PVA体系的扭矩和模头压力趋于稳定，说明PVA/水体系的热加工性能得到了很大改善。
The thermal processing of poly(vinyl alcohol) (PVA) is a big challenge worldwide. In this article, silver nitrate (AgNO3), which can combine with the hydroxyl groups of PVA and water, was introduced to further improve the thermal processability of the poly(vinyl alcohol)/water system. The water states, thermal performance, and rheological properties of PVA modified by AgNO3 were investigated. The results showed that with the increasing of AgNO3 content, the content of bound water in system increased ascribing to the interaction among PVA, water and AgNO3, indicating that the bondage of PVA matrix on water enhanced, thus retarding the tempestuous evaporation of water in system during melt process and making more water remain in system to play the role of plasticizer. Meanwhile, that AgNO3 combined with the hydroxyl groups of PVA further weakened the self-hydrogen bonding of PVA, guaranteeing a lower melting point and higher decomposition temperature, and broadening the thermal processing window. The rheological properties of the modified PVA system showed that the torque and die pressure of the modified PVA system turned to stabilization during melt processing, testifying that the thermal processability of the PVA/water system was largely improved.
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