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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Succinic Acid on the Shrinkage of Unsaturated Polyester Resin
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Effect of Succinic Acid on the Shrinkage of Unsaturated Polyester Resin

机译：琥珀酸对不饱和聚酯树脂收缩率的影响

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Succinic acid was presented as a small molecule low shrinkage additive (LSA) in unsaturated polyester resin (UPR). The effects of succinic acid on the volume shrinkage and the flexural strength of UPR cured at 80 +/- 1 degrees C were investigated and compared with those of macromolecule LSAs, including polyvinyl acetate (PVAc), polymethyl methacrylate (PMMA), and polystyrene (PS). The results indicated that the volume shrinkage of succinic acid/UPR specimen was significantly lower than those of specimens with macromolecule LSAs. The flexural strength of succinic acid/UPR specimen was improved. The optimal time of pre-esterification between succinic acid and the excess dihydric alcohol in UPR was 3.0 h, and the optimal addition of succinic acid was 20 g per 100 g UPR. Compared with 2,2-dimethyl malonic acid we put forward before, succinic acid was a cheaper and more commercial LSA, which obviously accelerated the pre-esterification process and presented excellent antishrinkage effect. DSC showed that with the addition of succinic acid, the polymerization of UPR was distinctive. The two-stage polymerization of UPR glue including the cross-polymerization of UPR and the homopolymerization of polyester was changed to a one-stage polymerization with lower exotherm and slower polymerization rate, which was optimal for UPR. FTIR and high resolution magic angle spinning nuclear magnetic resonance (HR/MAS NMR) were applied for the quantitative characterization of pre-esterification caused by succinic acid. Succinic acid performed better effects on the polymerization of UPR as compared to previous LSAs, and finally the homogeneous micro-structure of cured succinic acid/UPR formed and was demonstrated by SEM. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41276.
机译：琥珀酸是不饱和聚酯树脂（UPR）中的一种小分子低收缩添加剂（LSA）。研究了琥珀酸对在80 +/- 1摄氏度下固化的UPR的体积收缩率和抗弯强度的影响，并将其与大分子LSA（包括聚乙酸乙烯酯（PVAc），聚甲基丙烯酸甲酯（PMMA）和聚苯乙烯（ PS）。结果表明，琥珀酸/ UPR样品的体积收缩率明显低于具有大分子LSA的样品。琥珀酸/ UPR标本的抗弯强度得到提高。 UPR中琥珀酸与过量二元醇之间的预酯化最佳时间为3.0 h，每100 g UPR中琥珀酸的最佳添加量为20 g。与我们之前提出的2,2-二甲基丙二酸相比，琥珀酸是一种更便宜，更工业化的LSA，明显加快了酯化前的过程，并具有优异的抗收缩作用。 DSC显示，通过添加琥珀酸，UPR的聚合是独特的。 UPR胶的两阶段聚合（包括UPR的交联和聚酯的均聚）已变为具有较低的放热和较慢的聚合速率的一阶段聚合，这是UPR的最佳选择。 FTIR和高分辨率魔角旋转核磁共振（HR / MAS NMR）被用于表征琥珀酸引起的预酯化反应。与以前的LSA相比，琥珀酸对UPR的聚合效果更好，最终形成了固化的琥珀酸/ UPR均匀的微观结构，并由SEM证明。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41276。

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