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Effect of cyclic acetals structure on efficiency of photoinitiation

机译：环状缩醛结构对光引发效率的影响

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Cyclic acetals were proposed as free radical polymerization photoinitiators or co-initiators. The photopolymerization kinetics was recorded by real-time infrared spectroscopy (RTIR). 2-proply-1,3-benzodioxole (PBDO) and 2-hexyl-1,3-benzodioxole (HBDO) were efficient photoinitiators for the polymerization of 1,6-hexanedioldiacrylate (HDDA). Polymerization occurred at the highest rate with 1,3-benzodioxolane (BDO) as a co-initiator. When 1.82 wt % benzophenone (BP) was used as a photoinitiator, the addition of PBDO increased the rate of polymerization (Rp) and the final double bond conversion (DCf) of HDDA, and an optimum cure rate (0.982 minS1) was obtained at 1.64 wt%of PBDO. Combination of p-chlorobenzophenone (CBP) and PBDO had the highest initiating reactivity. Cyclic acetals were inefficient co-initiators for isopropylthioxanthone (ITX).
机译：环状缩醛被提出作为自由基聚合光引发剂或共引发剂。通过实时红外光谱（RTIR）记录光聚合动力学。 2-丙基-1,3-苯并二恶唑（PBDO）和2-己基-1,3-苯并二恶唑（HBDO）是用于1,6-己二醇二丙烯酸酯（HDDA）聚合的有效光引发剂。以1,3-苯并二氧戊环（BDO）为辅助引发剂，聚合反应发生率最高。当使用1.82 wt％的二苯甲酮（BP）作为光引发剂时，PBDO的添加增加了HDDA的聚合速率（Rp）和最终的双键转化率（DCf），并且获得了最佳的固化速率（0.982 minS1）。 PBDO的1.64 wt％。对氯二苯甲酮（CBP）和PBDO的结合具有最高的起始反应性。环缩醛是异丙基噻吨酮（ITX）的低效共引发剂。

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