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首页> 外文期刊>JCT research >Preparation and characterization of poly(trifluoropropylmethyl)siloxane-block-polyurethane-urea elastomers
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Preparation and characterization of poly(trifluoropropylmethyl)siloxane-block-polyurethane-urea elastomers

机译：聚（三氟丙基甲基）硅氧烷嵌段的聚氨酯-脲弹性体的制备与表征

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摘要

A series of poly(trifluoropropylmethyl)-siloxane-block-polyurethane-urea (FSPUU) films is prepared through moisture curing based on a three-step process. First, prepolymers are produced from poly(tetramethylene oxide) and toluenediisocyanate. Second, the prepolymers are chain-extended by α,ω-bis(3-aminopropyldiethoxylsilane) poly(trifluoropro-pylmethyl)siloxane (APFS). Third, another chain extension is performed using 3,3'-dichliride-4,4'-diami-nodiphenylmethane (DDDPM). The FSPUU films are characterized by Fourier transform IR spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, scanning electron microscopy, and mechanical testing. The effects of the APFS amount on the microstructure of the materials are also investigated. The results show that the material with approximately 15 wt% APFS exhibits high phase mixing. The materials display strong phase separations and weak tensile strengths when the APFS amounts range from 21.6 to 26.8 wt%. In particular, due to the incorporation of DDDPM in FSPUU, this segment increases the bonding of the different phases when the APFS amount is in the range of 35.6-44.5 wt%. The APFS segment is involved in compatibilizing the different phases in the materials. The tensile strength of the FSPUU films containing DDDPM can reach or surpass that of polyurethane. The copolymers may also have a functional application in coatings and adhesives.
机译：在三步法的基础上，通过湿气固化制备了一系列的聚（三氟丙基甲基）-硅氧烷-嵌段-聚氨酯-脲（FSPUU）薄膜。首先，预聚物是由聚四氢呋喃和甲苯二异氰酸酯生产的。第二，预聚物被α，ω-双（3-氨基丙基二乙氧基硅烷）聚（三氟丙基甲基）硅氧烷（APFS）扩链。第三，使用3,3'-二腈-4,4'-二氨基-二苯甲烷（DDDPM）进行另一个扩链。 FSPUU膜的特征在于傅立叶变换红外光谱，差示扫描量热法，动态力学分析，扫描电子显微镜和力学测试。还研究了APFS量对材料微观结构的影响。结果表明，具有约15重量％的APFS的材料表现出高相混合。当APFS的含量在21.6至26.8 wt％的范围内时，材料显示出强的相分离和弱的拉伸强度。特别地，由于在FSPUU中掺入了DDDPM，当APFS的量在35.6-44.5wt％的范围内时，该链段增加了不同相的结合。 APFS部分涉及使材料的不同阶段相容。含有DDDPM的FSPUU薄膜的拉伸强度可以达到或超过聚氨酯。该共聚物还可在涂料和粘合剂中具有功能性应用。

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