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首页> 外文期刊>Journal of Applied Polymer Science >Blocked isocyanates and isocyanated soybean oil as new chain extenders for unsaturated polyesters
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Blocked isocyanates and isocyanated soybean oil as new chain extenders for unsaturated polyesters

机译：封端异氰酸酯和异氰酸酯大豆油作为不饱和聚酯的新型扩链剂

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摘要

Two different blocked isocyanates, diphenylmethane-bis-4,4′- ethyleneurea and diphenylmethane-bis-4,4′-carbamoil-?μ- caprolactam, and isocyanated soybean oil were used as chain extenders for low-molecular-weight unsaturated polyesters. Oligomeric polyesters (molecular weight = 600-700), taken from a manufacturing process in the sixth hour of a 16-h polyesterification reaction, were reacted with these chain extenders, and the desired chain lengths (molecular weight = 1000-1500) were obtained in a very short time through the reaction of the chain extenders with the polyester end groups. The increase in the molecular weight was monitored with gel permeation chromatography. The obtained polymers were characterized with Fourier transform infrared and ~1H-NMR and with styrene solubility and gel time measurements. After dilution with styrene, the polyesters were cured with a radical initiator. The thermal and mechanical properties of the cured polyesters were examined with dynamic mechanical analysis and thermogravimetric analysis tests and then compared to those of a commercially available reference unsaturated polyester. The results show that unsaturated polyesters can be chain-extended with these compounds to shorten the polyesterification time substantially without alterations of the styrene solubility or gel time of the polyesters.
机译：两种不同的嵌段异氰酸酯，二苯基甲烷-双-4,4'-亚乙基脲和二苯基甲烷-双-4,4'-氨基甲酸酯-β-己内酰胺，和异氰酸酯豆油用作低分子量不饱和聚酯的扩链剂。在16小时聚酯化反应的第六小时内，从制造过程中获得的低聚聚酯（分子量= 600-700）与这些扩链剂反应，得到所需的链长（分子量= 1000-1500）在很短的时间内通过扩链剂与聚酯端基的反应。用凝胶渗透色谱法监测分子量的增加。所获得的聚合物通过傅立叶变换红外光谱和〜1H-NMR以及苯乙烯溶解度和凝胶时间测量进行表征。用苯乙烯稀释后，聚酯用自由基引发剂固化。通过动态力学分析和热重分析测试检查了固化聚酯的热和机械性能，然后将其与市售参考不饱和聚酯进行了比较。结果表明，不饱和聚酯可以与这些化合物链增长以基本上缩短聚酯化时间，而没有改变苯乙烯的苯乙烯溶解度或凝胶时间。

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