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Tin-Containing Crystalline Copolymers as Latent Catalysts for Polyurethanes
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-08-31 , DOI: 10.1021/acsapm.0c00627 Yang Gao 1 , Haijun Dong 1 , Licheng Liu 1 , Yingfeng Yu 1 , Zhengming Tang 2 , Chenyan Bai 2 , Thorsten Schmidt 3 , Yanli Feng 2 , Hongyu Chen 2
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-08-31 , DOI: 10.1021/acsapm.0c00627 Yang Gao 1 , Haijun Dong 1 , Licheng Liu 1 , Yingfeng Yu 1 , Zhengming Tang 2 , Chenyan Bai 2 , Thorsten Schmidt 3 , Yanli Feng 2 , Hongyu Chen 2
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For many applications, polyurethanes (PUs) need to have a fast curing speed and long pot life. Latent catalysts are seen to be one of the approaches that can fulfill this need. In this article, we have synthesized a series of copolymers with n-alkyl acrylates and a reactive tin catalyst, dibutyltin maleate, by conventional free radical polymerization using azodiisobutyronitrile (AIBN) as an initiator and dodecanethiol as a chain transfer agent. The copolymers with crystalline side chains were characterized by gel permeation chromatography (GPC), 1H NMR, 13C NMR, differential scanning calorimetry (DSC), and ion chromatography. The tin-containing copolymers showed high crystallinity. The melting temperature of the copolymers decreases slightly with the decrease of molecular weight (Mw), while the crystallinity remains almost unchanged. The catalytic performance and latency of the crystalline copolymers with different particle sizes were characterized by rheological measurement and Fourier transform infrared spectroscopy (FTIR). The crystalline copolymers showed quite good latency at 30 °C and high reactivity above the melting point. Both the particle size and the Mw of the copolymers had effects on the latency of crystalline catalysts. The PU adhesive with copolymers showed a higher peel strength at the initial stage than the noncatalyzed one and comparable final properties as compared with the samples with dibutyltin dilaurate and dibutyltin maleate.
中文翻译：
含锡结晶共聚物作为聚氨酯的潜在催化剂
对于许多应用，聚氨酯（PU）需要具有快速的固化速度和较长的适用期。潜在的催化剂被认为是可以满足这一需求的方法之一。在本文中，我们通过使用偶氮二异丁腈（AIBN）作为引发剂和十二烷硫醇作为链转移剂的常规自由基聚合反应，合成了一系列丙烯酸正烷基酯与活性锡催化剂马来酸二丁锡的共聚物。具有结晶侧链的共聚物通过凝胶渗透色谱法（GPC），1 H NMR，13进行表征1 H NMR，差示扫描量热法（DSC）和离子色谱。含锡共聚物显示出高结晶度。共聚物的熔融温度随着分子量（M w）的降低而略有降低，而结晶度几乎保持不变。通过流变学测量和傅里叶变换红外光谱（FTIR）表征了不同粒径的结晶共聚物的催化性能和潜伏期。结晶共聚物在30°C下表现出相当好的潜伏期，并且在熔点以上具有很高的反应活性。粒径和M w共聚物的数量对结晶催化剂的等待时间有影响。与具有二月桂酸二丁基锡和马来酸二丁基锡的样品相比，具有共聚物的PU粘合剂在初始阶段显示出比未催化的剥离强度更高的剥离强度，并且具有可比较的最终性能。
更新日期：2020-08-31
中文翻译：
含锡结晶共聚物作为聚氨酯的潜在催化剂
对于许多应用，聚氨酯（PU）需要具有快速的固化速度和较长的适用期。潜在的催化剂被认为是可以满足这一需求的方法之一。在本文中，我们通过使用偶氮二异丁腈（AIBN）作为引发剂和十二烷硫醇作为链转移剂的常规自由基聚合反应，合成了一系列丙烯酸正烷基酯与活性锡催化剂马来酸二丁锡的共聚物。具有结晶侧链的共聚物通过凝胶渗透色谱法（GPC），1 H NMR，13进行表征1 H NMR，差示扫描量热法（DSC）和离子色谱。含锡共聚物显示出高结晶度。共聚物的熔融温度随着分子量（M w）的降低而略有降低，而结晶度几乎保持不变。通过流变学测量和傅里叶变换红外光谱（FTIR）表征了不同粒径的结晶共聚物的催化性能和潜伏期。结晶共聚物在30°C下表现出相当好的潜伏期，并且在熔点以上具有很高的反应活性。粒径和M w共聚物的数量对结晶催化剂的等待时间有影响。与具有二月桂酸二丁基锡和马来酸二丁基锡的样品相比，具有共聚物的PU粘合剂在初始阶段显示出比未催化的剥离强度更高的剥离强度，并且具有可比较的最终性能。
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