Acid catalyzed cross-linking of polyvinyl alcohol for humidifier membranes,Journal of Applied Polymer Science

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Acid catalyzed cross-linking of polyvinyl alcohol for humidifier membranes
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-09-14 , DOI: 10.1002/app.51606
Andre Michele ₁ , Patrick Paschkowski ₂ , Christopher Hänel ₂ , Günter E. M. Tovar ₁ , Thomas Schiestel ₂ , Alexander Southan ₁

Affiliation

Polyvinyl alcohol (PVA) is a hydrophilic polymer well known for good film forming properties, high water vapor permeance J_W, and low nitrogen permeance. However, depending on molar mass and temperature, PVA swells strongly in water until complete dissolution. This behavior affects the usability of PVA in aqueous environments and makes cross-linking necessary if higher structural integrity is envisaged. In this work, PVA networks are formed by thermal cross-linking in the presence of p-toluenesulfonic acid (TSA) and investigated in a design of experiments approach. Experimental parameters are the cross-linking period t_c, temperature ϑ and the TSA mass fraction w_TSA. Cross-linking is found to proceed via ether bond formation at all reaction conditions. Degradation is promoted especially by a combination of high w_TSA, t_c and ϑ. Thermal stability of the networks after preparation is strongly improved by neutralizing residual TSA. Humidification membranes with a J_W of 6423 ± 63.0 gas permeation units (GPU) are fabricated by coating PVA on polyvinyliden fluoride hollow fibers and cross-linking with TSA. Summarizing, the present study contributes to a clearer insight into the cross-linking of PVA in presence of TSA, the thermal stability of the resulting networks and the applicability as selective membrane layers for water vapor transfer.

中文翻译：

加湿膜用聚乙烯醇的酸催化交联

聚乙烯醇 (PVA) 是一种亲水性聚合物，以良好的成膜性能、高水蒸气渗透性J _W和低氮渗透性而闻名。然而，取决于摩尔质量和温度，PVA 在水中强烈溶胀直至完全溶解。这种行为会影响 PVA 在水性环境中的可用性，如果设想更高的结构完整性，则需要进行交联。在这项工作中，PVA 网络是在对甲苯磺酸 (TSA)存在下通过热交联形成的，并在实验设计方法中进行了研究。实验参数是交联周期t _c、温度ϑ和 TSA 质量分数w _TSA. 发现交联在所有反应条件下都是通过醚键形成进行的。高w _TSA、t _c和ϑ的组合尤其会促进降解。制备后网络的热稳定性通过中和残留的 TSA 大大提高。J _W为 6423 ± 63.0 气体渗透单位 (GPU) 的加湿膜是通过在聚偏氟乙烯中空纤维上涂覆 PVA 并与 TSA 交联来制造的。总而言之，本研究有助于更清楚地了解 PVA 在 TSA 存在下的交联、所得网络的热稳定性以及作为选择性膜层用于水蒸气传输的适用性。

更新日期：2021-11-01

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