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首页> 外文期刊>Journal of Applied Polymer Science >Plasticization of poly(vinyl butyral) by water: Glass transition temperature and mechanical properties
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Plasticization of poly(vinyl butyral) by water: Glass transition temperature and mechanical properties

机译：用水塑化（乙烯基丁醛）：玻璃化转变温度和机械性能

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摘要

The effect of plasticization by water on the mechanical properties of additive-free poly(vinyl butyral) (PVB) was investigated. PVB is hygroscopic and the amount of absorbed water was measured in various environmental conditions. Two kinds of interactions with hydrophilic sites was demonstrated. The thermal and thermomechanical studies (differential scanning calorimetry and dynamic mechanical thermal analysis) showed that water decreases the glass transition temperature thus acting as a plasticizer. This gives the material larger deformation capability and increased toughness. Surprisingly, the modulus remains high and this was explained by a structure consisting in two phases with different levels of plasticization, reflected by a double peak of relaxation associated to multiple phases with different glass transition temperature. Atomic force microscopy measurements on samples with high level of hydration shows evidence of nanometric hydrated domains acting as an elastomeric phase and thus inducing toughening of the material. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47230.
机译：研究了水塑化对无添加剂聚（乙烯基丁醛）（PVB）的力学性能的影响。 PVB是吸湿性的，并且在各种环境条件下测量吸收的水量。证明了两种与亲水位点的相互作用。热和热机械研究（差示扫描量热法和动态机械热分析）表明，水降低了玻璃化转变温度，从而作用为增塑剂。这使得材料更大的变形能力和增加的韧性。令人惊讶的是，模量保持高，这是由两个阶段组成的结构解释，该塑化水平不同，通过与具有不同玻璃化转变温度的多相相关的弛豫的双峰反射。具有高水合水合水合的样品的原子力显微镜测量显示了作用为弹性体相的纳米水合结构域的证据，从而诱导材料的增韧。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47230。

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