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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics of UV-initiated RAFT crosslinking polymerization of dimethacrylates
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Kinetics of UV-initiated RAFT crosslinking polymerization of dimethacrylates

机译：UV引发的RAFT交联二甲基丙烯酸酯的动力学

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The UV-initiated RAFT polymerizations of a series of poly(ethylene glycol) dimethacrylates (PEGDMA) were investigated using differential scanning photocalorimetry (DPC) at room temperature. The rate of the RAFT system was much lower than that of a conventional free radical polymerization. A mild autoacceleration occurred as the addition reaction became diffusion controlled. The influence of the spacer length (CH2CH2O)x between the vinyl moieties of the dimethacrylates on the polymerization kinetics was examined. The polymerization rate of PEGDMA decreased with an increased x value from 4 to 9, but it increased with a further increased x value from 9 to 14. Mechanical properties of the resulting polymers were also examined by dynamic mechanical analysis (DMA). It was concluded that the presence of the RAFT agent during polymerization of multifunctional monomers did not have an effect on the heterogeneity of the polymer network. In comparison with three different PEGDMAs, the PEGDMA with the longest spacer formed the most homogeneous networks with a lower crosslinking density.
机译：使用差示扫描量热法（DPC）在室温下研究了一系列聚（乙二醇）二甲基丙烯酸酯（PEGDMA）的UV引发的RAFT聚合。 RAFT体系的速率远低于常规自由基聚合的速率。随着加成反应的扩散控制，发生了轻微的自加速。考察了二甲基丙烯酸酯的乙烯基部分之间的间隔长度（CH 2 CH 2 O）x对聚合动力学的影响。 PEGDMA的聚合速率随着x值从4增加到9而降低，但是随着x值从9进一步增加到14而增加。还通过动态力学分析（DMA）检查了所得聚合物的机械性能。结论是，在多官能单体聚合过程中，RAFT试剂的存在对聚合物网络的不均一性没有影响。与三种不同的PEGDMA相比，具有最长间隔基的PEGDMA形成了具有较低交联密度的最均匀的网络。

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