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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Difunctional Acids on the Physicochemical, Thermal, and Mechanical Properties of Polyester Polyol-Based Polyurethane Coatings
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Effect of Difunctional Acids on the Physicochemical, Thermal, and Mechanical Properties of Polyester Polyol-Based Polyurethane Coatings

机译：双官能团酸对聚酯多元醇基聚氨酯涂料的理化，热和机械性能的影响

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摘要

Polyester polyol (PP)-based polyurethanes (PUs) consisting of two difunctional acids [1,4-cyclohexanedicarboxylic acid (CHDA) and 1,6-adipic acid (AA)] and also two diols [1,4-cyclohexanedimethanol (CHDM) and 1,6-hexanediol (HDO)] were synthesized by a two-step procedure with a variable feed ratio of CHDA to AA but fixed ratio of CHDM and HDO. The prepared PPs and/or PUs were characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, and atomic force microscopy. The effects of difunctional acids on the thermal, mechanical, and dynamic mechanical thermal properties of PPs or PU films were investigated by thermogravimetry analysis, differential thermogravimetry and dynamic mechanical thermal analysis. The results show that PP exhibits a lowest viscosity with the mole fraction of CHDA and AA at 3 : 7 whereas it delivers a lowest melting point with the mole fraction at 9 : 1. After PPs being cross-linked by isocyanate trimers, the impact resistance, shear strength and glass transition temperature increase the mixed-acid formulations with increasing the content of CHDA. In detail, the resultant PU almost simultaneously exhibits the best mechanical and thermal properties when the mole fraction of CHDA and AA is kept constant at 9 : 1, thus giving rise to a high glass transition temperature of 56.4 degrees C and a onset decomposition temperature of 350 degrees C, and also delivering a balanced toughness and hardness with an impact resistance of 100 J/g and storage modulus as high as 10(9) Pa. This path for synthesis of PP-based PU provides a design tool for high performance polymer coatings. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41246.
机译：基于聚酯多元醇（PP）的聚氨酯（PU），由两种双官能团酸[1,4-环己烷二甲酸（CHDA）和1,6-己二酸（AA）]和两种二醇[1,4-环己烷二甲醇（CHDM）]组成通过分两步合成CHDA与AA的进料比例可变，而CHDM与HDO的固定比例的二步合成方法合成1，6-己二醇（HDO）]。通过傅立叶变换红外光谱，X射线衍射光谱和原子力显微镜对所制备的PP和/或PU进行表征。通过热重分析，差示热重分析和动态机械热分析研究了双官能酸对PPs或PU膜的热，机械和动态机械热性能的影响。结果表明，PP的粘度最低，CHDA和AA的摩尔分数为3：7，而熔点最低的摩尔分数为9：1。PPs被异氰酸酯三聚体交联后，耐冲击性，剪切强度和玻璃化转变温度随着CHDA含量的增加而增加了混合酸配方。详细地讲，当CHDA和AA的摩尔分数保持恒定在9：1时，所得的PU几乎同时显示出最佳的机械和热性能，从而产生了56.4摄氏度的高玻璃化转变温度和420摄氏度的起始分解温度。 350摄氏度，并提供平衡的韧性和硬度，具有100 J / g的耐冲击性和高达10（9）Pa的储能模量。这种合成基于PP的PU的途径为高性能聚合物提供了设计工具涂料。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41246。

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