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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical Behavior and Structure of Rubber Modified Vinyl Ester Resins
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Mechanical Behavior and Structure of Rubber Modified Vinyl Ester Resins

机译：橡胶改性乙烯基酯树脂的力学行为和结构

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摘要

Vinyl esters are sued widely as theroset matrix materials for reinforced composites; however, they suffer from low-impact resistance. Substantial enhancement of the toughness of brittle polymers may be achieves by dispersing elastomeric inclusions or rubber particles in the polymer matrix, inducing multiple crazing and shear yielding of the matrix. The main objectives of this work are morpholigical characterization of vinyl ester/reactive rubber systems and investigation of the mechanical and fracture behavior of these systems. Additional studies focused on rubber endcapped vinyl ester in the absence and presence of added reactive rubber. The initial compatibility of the liquid rubber with the liquid resin was studied. This is a key factor, along with cure conditions, in determination of the possible morphologies, namely, the drgree of phase separation and particle size. The initial rubber/resin compartibility was found poor and all attempts to improve it by means of surfactants or ultrasonic treatment have not been successful. The flexure mechanical and fracture behavior of the cured resin/rubber systems was investigated. Three basic types of crack propagation behavior, stable, unstable, and stick-slip, were observed. Fracture toughness of various resin/rubber systems was evaluated and was found to increase with increased content of rubbery second-phase meterial. However, these is some payoff in stiffness and flexural strength of the cured resins. The addition of rubber does not affect the resin toughness at impact conditions. Analysis and interpretation of fractures morphology show that both mutiple crazing and external cavitation play an important role in the fracture mechansim of the rubber modified specimens. No shear yielding is evident.
机译：乙烯基酯被广泛用作增强复合材料的玫瑰酸酯基质材料。但是，它们具有低抗冲击性。可通过将弹性体内含物或橡胶颗粒分散在聚合物基体中，引起基体的多次开裂和剪切屈服来实现脆性聚合物的韧性的显着提高。这项工作的主要目的是乙烯基酯/反应性橡胶体系的形态学表征以及对这些体系的机械和断裂行为的研究。其他研究集中于在不存在和存在反应性橡胶的情况下橡胶封端的乙烯基酯。研究了液态橡胶与液态树脂的初始相容性。在确定可能的形态（即相分离度和粒径）时，这是与固化条件一起使用的关键因素。发现最初的橡胶/树脂的相容性差，并且通过表面活性剂或超声处理对其进行改进的所有尝试均未成功。研究了固化的树脂/橡胶体系的挠曲力学和断裂行为。观察到三种基本类型的裂纹扩展行为，即稳定，不稳定和粘滑。评价了各种树脂/橡胶体系的断裂韧性，发现其随着橡胶状第二相材料含量的增加而增加。然而，这些是固化树脂的刚度和挠曲强度的一些回报。橡胶的添加在冲击条件下不会影响树脂的韧性。断裂形态的分析和解释表明，多裂纹和外空化在橡胶改性试样的断裂机理中都起着重要作用。没有明显的剪切屈服。

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