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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of high solid content aqueous polyurethane dispersion
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Synthesis and characterization of high solid content aqueous polyurethane dispersion

机译：高固含量聚氨酯水分散体的合成与表征

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Aqueous polyurethane (APU) dispersions having a solid content of 50% were synthesized using dimethyol propionic acid (DMPA) as the stabilizing moiety. The principal diols used were poly-1,4-butylene adipate glycol (PBA). The diisocyanates used in this study were a 30:70 blend of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI). All these samples were neutralized using triethylamine (TEA) and chain-extended using ethylene diamine (FDA). The effects of the COOH content, NCO/OH molar ratio, and molecular weight (M-n) of PBA on the properties of APU dispersion and its cast film were studied. Dynamic light scattering results revealed that these high solid content dispersions shown broad particle size distributions as well as bimodal. Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA) results showed that as the hard segment content increased, the melting point (T-m) of the APU cast film increased, but the glass transition temperature (T-g) did not show significant alteration, when a PBA lower than 1000 M-n, was used, the APU exhibited faint soft-segment crystallization and tended to form amorphous polymer. Tensile and T-peel strength tests attained excellent mechanical properties, such as a maximum Young's modulus of 166 MPa and the elongation at break reached to 2000%. T-peel strength test (PVC/PVC) yielded a maximum peel strength value of 8.8 N/mm. (c) 2007 Wiley Periodicals, Inc.
机译：使用二甲酚丙酸（DMPA）作为稳定部分，合成了固含量为50％的聚氨酯（APU）水分散体。所用的主要二醇是聚1，4-丁烯己二酸酯二醇（PBA）。本研究中使用的二异氰酸酯是六亚甲基二异氰酸酯（HDI）和异佛尔酮二异氰酸酯（IPDI）的30:70混合物。所有这些样品均使用三乙胺（TEA）中和，并使用乙二胺（FDA）进行扩链。研究了PBA的COOH含量，NCO / OH摩尔比和分子量（M-n）对APU分散体及其流延膜性能的影响。动态光散射结果表明，这些高固含量的分散体显示出较宽的粒径分布以及双峰分布。差示扫描量热法（DSC）和动态机械热分析（DMA）结果表明，随着硬链段含量的增加，APU流延膜的熔点（Tm）升高，但玻璃化转变温度（Tg）却没有明显变化。当使用低于1000Mn的PBA时，APU表现出微弱的软段结晶并且倾向于形成无定形聚合物。拉伸和T-剥离强度测试获得了优异的机械性能，例如最大杨氏模量为166 MPa，断裂伸长率达到2000％。 T-剥离强度测试（PVC / PVC）得出的最大剥离强度值为8.8 N / mm。 （c）2007年Wiley Periodicals，Inc.

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