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首页> 外文期刊>Journal of Applied Polymer Science >Epoxidized phenolic novolac: A novel modifier for unsaturated polyester resin
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Epoxidized phenolic novolac: A novel modifier for unsaturated polyester resin

机译：环氧酚醛清漆：一种用于不饱和聚酯树脂的新型改性剂

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摘要

Unsaturated polyester resins (UPRs) are used widely in the fiber-reinforced plastics (FRPs) industry. These resins have the disadvantages of brittleness and poor resistance to crack propagation. In this study, hybrid polymer networks (HPNs) based on UPR and epoxidized phenolic novolacs (EPNs) were prepared by reactive blending. A HPN is composed of a backbone polymer containing two types of reactive groups that can take part in crosslinking reactions via different mechanisms. EPNs were prepared by glycidylation of novolacs using epichlorohydrin. The novolacs had varying phenol: formaldehyde ratios. Blends of unsaturated polyester with EPN were then prepared. The physical properties of the cured blends were compared with those of the control resin. EPN shows good miscibility and compatibility with the resin and improves the toughness and impact resistance substantially. Considerable enhancement of tensile strength is also noticed at about 5% by weight of epoxidized novolac resin. TGA, DMA, and DSC were used to study the thermal properties of the toughened resin and the fracture behavior was studied using SEM. The blends are also found to have better thermal stability. Blending with EPN can be a useful and cost-effective technique for modification of UPR. (c) 2006 Wiley Periodicals, Inc.
机译：不饱和聚酯树脂（UPR）广泛用于纤维增强塑料（FRP）工业。这些树脂具有脆性和抗裂纹扩展的缺点。在这项研究中，通过反应共混制备了基于UPR和环氧化酚醛清漆（EPN）的杂化聚合物网络（HPN）。 HPN由含有两种类型反应性基团的主链聚合物组成，这些反应性基团可以通过不同的机理参与交联反应。通过使用环氧氯丙烷使酚醛清漆缩水甘油基化来制备EPN。酚醛清漆具有变化的苯酚：甲醛比率。然后制备不饱和聚酯与EPN的共混物。将固化共混物的物理性能与对照树脂的物理性能进行比较。 EPN表现出与树脂的良好混溶性和相容性，并显着提高了韧性和抗冲击性。还发现在约5重量％的环氧化酚醛清漆树脂中，抗张强度得到了显着提高。 TGA，DMA和DSC用于研究增韧树脂的热性能，并使用SEM研究其断裂行为。还发现该共混物具有更好的热稳定性。与EPN混合可能是一种有用且具有成本效益的技术，可用于更改UPR。 （c）2006年Wiley Periodicals，Inc.

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