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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of aqueous polyurethane dispersions with well-defined soft segments
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Preparation and characterization of aqueous polyurethane dispersions with well-defined soft segments

机译：定义明确的软链段的水性聚氨酯分散体的制备和表征

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摘要

Novel aqueous polyurethane (PU) hybrid dispersions were successfully prepared with 5-15 mol % functionalized hexamethylene diisocynate trimer modified by N-(n-butyl)-3-aminopropyltriethoxysilane and dihydroxylpropyl- terminated siloxane oligomers (TS). The results of the differential scanning calorimetry and X-ray diffraction tests show that the degree of segment order was reduced by the introduction of TS. The hybrid polymer films with TS introduced into the PU backbone displayed excellent water and xylene resistance. Atomic force microscopy showed that the films had a smooth surface. It was noticeable that the tensile strength (σ_b) and Young's modulus of the films increased simultaneously when TS was incorporated into PU; σ_b of the PU15 film with 15 mol % TS was much higher than that of the neat PU0 film, and the breaking elongation of the film with 10 mol % TS was clearly higher than that of the other films. The results indicate that an appropriate content of TS significantly improved the properties of the aqueous PU hybrids.
机译：新型水性聚氨酯（PU）杂化分散体已成功制备了5-15 mol％的官能化的六亚甲基二异氰酸酯三聚体，该三聚体经N-（正丁基）-3-氨基丙基三乙氧基硅烷和二羟丙基末端的硅氧烷低聚物（TS）改性。差示扫描量热法和X射线衍射测试的结果表明，通过引入TS降低了片段顺序的程度。将TS引入PU骨架的杂化聚合物薄膜表现出出色的耐水和二甲苯性能。原子力显微镜显示膜具有光滑的表面。值得注意的是，将TS掺入PU中后，薄膜的拉伸强度（σ_b）和杨氏模量同时增加。 TS含量为15 mol％的PU15薄膜的σ_b远远高于纯PU0薄膜，而TS含量为10 mol％的薄膜的断裂伸长率明显高于其他薄膜。结果表明，适当含量的TS显着改善了水性PU杂种的性能。

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