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首页> 外文期刊>Journal of Applied Polymer Science >Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters
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Systematic investigation of mechanical properties and fracture toughness of epoxy networks: Role of the polyetheramine structural parameters

机译：环氧网络力学性能和断裂韧性的系统研究：聚醚胺结构参数的作用

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Polyetheramine (PEA)-modified epoxies with various types of PEAs were prepared and respective effects on characteristics of epoxy networks were studied. The used PEAs were polyethylene glycol diamine (PEG-amine) and polypropylene glycol diamine (PPG-amine) with two different molecular weights (i.e., 200 and 400gmol(-1)). According to mechanical tests, the structural parameters of PEAs played an important role in final properties of epoxy/amine systems. PEG(400)-amine and PPG(200)-amine had the highest and lowest effects on the properties of epoxy networks, respectively. Whereas 10 phr PEG(400)-amine increased critical stress intensity factor (K-IC) and critical strain energy release rate (G(IC)) of the epoxy up to 82 and 294%, the same number of PPG(200)-amine chains caused to increase the K-IC and G(IC) up to 11 and 34%. This discrepancy could be assigned to higher flexibility index (phi=26.22), longer chain length (27 atoms), and higher secondary interactions [=9.69 (calcm(-3))(0.5)] of PEG(400)-amine in comparison with PPG(200)-amine [with phi=8.08, 10 atoms in chain, and =8.98 (calcm(-3))(0.5)]. Shear yielding as a toughening mechanism was proposed based on microscopy of the crack tips. These in-depth studies could uncover underlying structure-property relationships in a relevant class of PEA-like modifiers, shedding light on the future design of top-performing homogeneous tough polymer networks. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47121.
机译：制备了聚醚胺（PEA）制备了具有各种豌豆的多种环氧树脂，并研究了对环氧网络的特征的各种影响。用过的豌豆是聚乙二醇二胺（PEG-胺）和聚丙二醇二胺（PPG-胺），具有两种不同的分子量（即200和400gmol（-1））。根据机械测试，豌豆的结构参数在环氧/胺系统的最终性质中发挥了重要作用。 PEG（400） - 胺和PPG（200） - 胺分别对环氧网络的性质具有最高和最低影响。虽然10phr Peg（400） - 胺增加了临界应力强度因子（K-IC）和临界应变能量释放速率（临界应变能量释放速率（G（IC））高达82和294％，相同数量的PPG（200） - 胺链使K-IC和G（IC）增加到11％和34％。可以将该差异分配给更高的柔韧性指数（PHI = 26.22），较长链长（27个原子）和更高的次级相互作用[= 9.69（COMPM（COMPM（-3））（0.5）]相比之下用PPG（200） - 胺[链中PHI = 8.08,10个原子，= 8.98（COMPM（-3））（0.5）]。基于裂纹尖端的显微镜提出了作为增韧机理的剪切。这些深入的研究可以在一类相关的PEA样修饰符中揭示潜在的结构性质关系，在未来的均匀性坚韧的聚合物网络上脱光。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47121。

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