Non-isocyanate polyurethanes (NIPUs) synthesized from biodiesel-derived diglycerol dicarbonate (DGC) and triamine functional poly(propylene glycol) (Jeffamine) are investigated to improve upon poor water resistance and slow curing kinetics observed in (DGC/diamine functional Jeffamine) NIPUs. The structural, thermal, and rheological properties of the prepolymer formulations match those of their diamine-prepared analog previously reported. The NIPU prepolymers (number average molecular weight, M_N between 4200 and 6400 g mol⁻¹) are subsequently functionalized with trimethoxy silane end-cappers to yield moisture-curable hybrid NIPUs. The prepolymers are both successfully end-capped and subsequently cured under ambient conditions. The sol/gel curing kinetics of the prepolymers are extensively studied, and the effects of the capping methodology, moisture, and the amount of catalyst are quantified so that gel times are observed in as little as 1.4 h at room temperature. The developed curing methods are effective leading to final hybrid films with high gel contents (>86%). The tensile properties of the final films resulting are considerably better compared to previously reported DGC/Jeffamine-based NIPUs, which are too soft to undergo mechanical testing. Also, the films are found to exhibit a tenfold decrease in water absorption compared to the latter (5% vs 70%, respectively).

中文翻译：

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聚丙二醇基三胺对混杂非异氰酸酯聚氨酯溶胶/凝胶固化及性能的影响

研究了由生物柴油衍生的二碳酸二甘油酯 (DGC) 和三胺官能聚 (丙二醇) (Jeffamine) 合成的非异氰酸酯聚氨酯 (NIPU)，以改善在 (DGC/二胺官能 Jeffamine) NIPU 中观察到的较差的耐水性和缓慢的固化动力学. 预聚物配方的结构、热和流变特性与之前报道的二胺制备类似物相匹配。NIPU 预聚物（数均分子量，M _N介于 4200 和 6400 g mol ^-1之间) 随后用三甲氧基硅烷封端剂进行功能化，以产生可湿固化的混合 NIPU。预聚物均成功封端并随后在环境条件下固化。对预聚物的溶胶/凝胶固化动力学进行了广泛研究，并对封端方法、水分和催化剂量的影响进行了量化，从而在室温下可在短短 1.4 小时内观察到凝胶时间。所开发的固化方法是有效的，导致最终的混合膜具有高凝胶含量 (>86%)。与先前报道的基于 DGC/Jeffamine 的 NIPU 相比，最终薄膜的拉伸性能要好得多，后者太软而无法进行机械测试。此外，与后者相比，发现薄膜的吸水率降低了 10 倍（5% 对 70%，