Exploitation of acetalization process of poly(vinyl alcohol) for the formation of crosslinked poly(vinyl formal) foams,Polymer Engineering and Science

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Exploitation of acetalization process of poly(vinyl alcohol) for the formation of crosslinked poly(vinyl formal) foams
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-06-12 , DOI: 10.1002/pen.25449
Honghui Liao ₁ , Yuan Liu ₁ , Shudong Lin ₂

Affiliation

In the present work, poly(vinyl formal) (PVF) foams were prepared using water as the pore‐forming agent and formaldehyde as the crosslinking agent. The acetalization process of poly(vinyl alcohol) was exploited in depth in order to obtain a precise guidance on the preparation of PVF foams with adjustable properties. With the increasing of formaldehyde, the crosslinking degree was gradually increased and the prepared PVF foams changed to be amorphous. Morphology observation showed that the porous structure of PVF foams was successfully created using water as the blowing agent and it was strongly affected by the crosslinking agent and polymer concentration, leading to an easily tuned pore size from hundreds of microns to few microns. The prepared foams were proved to have small apparent density below 0.27 g/cm⁻³ and excellent mechanical strength, with the largest specific compressive strength of 11.54 MPa·cm³·g⁻¹. Based on the results, it is believed that this study can provide a scientific basis for the design and optimization of PVF foams with controllable structure and properties.

中文翻译：

利用聚乙烯醇缩醛化工艺形成交联聚乙烯醇缩甲醛泡沫

在目前的工作中，使用水作为成孔剂和甲醛作为交联剂制备了聚乙烯醇缩甲醛（PVF）泡沫。聚乙烯醇的缩醛化工艺被深入研究，目的是为制备具有可调性能的PVF泡沫塑料提供精确的指导。随着甲醛的增加，交联度逐渐增加，制得的PVF泡沫变为无定形。形态学观察表明，以水为发泡剂成功地形成了PVF泡沫的多孔结构，并且它受到交联剂和聚合物浓度的强烈影响，从而导致孔径易于调节，从数百微米到几微米。证明所制备的泡沫在0.27g / cm ^-3以下具有小的表观密度。机械强度优异，最大比抗压强度为11.54MPa·cm ³ ·g ^-1。根据结果，可以认为该研究可以为结构和性能可控的PVF泡沫的设计和优化提供科学依据。

更新日期：2020-06-12

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