New technology for thermal processing of poly(vinyl alcohol)
New technology for thermal processing of poly(vinyl alcohol)
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聚乙烯醇热加工新技术
DOI：
10.1179/174328907x237575
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发表时间：
2007-01-01
影响因子：
2
通讯作者：
Wang, Q.
中科院分区：
文献类型：
--
作者：
Chen, N.;Li, L.;Wang, Q.
聚乙烯醇（PVA）的热加工一直是世界范围内的一大挑战，因为它的熔点非常接近其分解温度。基于分子间络合和增塑作用，采用与 PVA 具有互补结构的含氨基化合物（Ac）与水一起改善 PVA 的热处理。结果表明，水和Ac可以控制PVA的超分子结构，限制其结晶，降低其熔点，从而获得PVA的热加工窗口。从而实现PVA纤维的熔融纺丝、PVA薄膜的挤出吹塑以及PVA容器的挤出吹塑成型。从而获得拉伸强度超过1.9GPa的PVA高性能纤维、具有良好力学性能和透明度的PVA吹膜以及具有良好汽油阻隔性和耐热性的PVA容器。与传统的PVA溶液湿法加工相比，改性PVA采用的热加工技术更加简单、有效且节省成本。更令人鼓舞的是，具有优异耐化学性和物理性能的PVA容器将为PVA开辟新的应用领域。
Thermal processing of poly(vinyl alcohol) (PVA) has been a big challenge worldwide because its melting point is very close to its decomposition temperature. Based on intermolecular complexation and plasticisation, an amido containing compound (Ac), which has a complementary structure to PVA, together with water, were adopted to improve thermal processing of PVA. The results show that water and Ac can control the supramolecular structure of PVA, confine its crystallisation, decrease its melting point, thus obtain the thermal processing window for PVA. In this way, melt spinning of PVA fibres, extrusion blowing of PVA films and extrusion blowing moulding of PVA containers are realised. Then PVA high performance fibres with tensile strength over 1.9 GPa, PVA blown films with good mechanical properties and transparency, and PVA containers with good gasoline barrier properties and thermal resistance are obtained. Compared with the traditional wet processing of PVA solution, the thermal processing technology adopted for modified PVA is much more simple, effective and cost saving. More encouragingly, the PVA container with excellent chemical resistance and physical properties will open a new application field for PVA.