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Toughening of epoxy resins by partially decomposed polyurethane waste

机译：通过部分分解的聚氨酯废物加固环氧树脂

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Hygrothermally decomposed polyurethane (HDPUR) of polyester type has been used as a cost-efficient impact modifier in tri- and tetrafunctional epoxy (EP) resins. The PUR modifier was added between 5 and 80 wt.percent to the EP prior its crosslinking with a diamine compound (Diaminodiphenylsulphone, DDS). The fracture toughness (K_c) and -energy (G_c) of the modified resins were determined on static loaded compact tension (CT) specimens at ambient temperature. The mean molecular weight between crosslinks (M_c) was determined from the rubbery plateau modulus of dynamic mechanical thermal analysis (DMTA) spectra. The change in the K_c and G_c as a function of M_c followed the prediction of the rubber elasticity theory. The efficiency of the PUR modifier was compared with that of a carbonyl terminated liquid nitrile rubber (CTBN). DMTA and fractographic inspection revealed thatthe PUR modifier was not only present in a dispersed phase of the EP matrix but participated in the build-up of the EP crosslinked network structure. Thus HD-PUR works as active diluent and phase separating additive at the same time. As HD-PUR can be regarded as an amine-functionalized rubber, it was used as hardener aone (by replacing DDS) in some EP formulations.
机译：聚酯类型的湿热分解聚氨酯（HDPUR）已被用作三官和四官能环氧（EP）树脂中的成本效益的抗冲改性剂。在用二胺化合物（二氨基二核苷粉，DDS）的交联之前，将PUR改性剂加入5至80重量％。在环境温度下对静载紧凑的紧凑张力（CT）样品测定改性树脂的断裂韧性（K_c）和-NC）。交联（M_C）之间的平均分子量由动态机械热分析（DMTA）光谱法测定。 K_C和G_C的变化作为M_C的函数，然后是橡胶弹性理论的预测。将PUR改性剂的效率与羰基封端的液态丁腈橡胶（CTBN）进行比较。 DMTA和Fretographic Oppection揭示了PUR改性剂不仅存在于EP矩阵的分散阶段，而是参与EP交联网络结构的积累。因此，HD-PUR在同时用作活性稀释剂和相分离添加剂。随着HD-PUR可以被视为胺官能化橡胶，它用作一些EP配方中的硬化剂AONE（通过替换DDS）。

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