Photopolymerization behavior of di(meth)acrylate oligomers
作者： Q. Yu , S. Nauman , J. P. Santerre , S. Zhu
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摘要: Photo-initiated polymerizations of two series di(meth)acrylate oligomers, one bisphenol-A based and the other ethylene glycol based, with a camphorquinone/tertiary amine radical photo-initiator system were studied using differential scanning calorimetry. Bisphenol-A oligomers polymerized much faster than because higher viscosity E-bis-A induced an autoacceleration upon exposure to ultraviolet (UV) radiation; however, vinyl conversions observed due their greater segmental mobility elastomeric character cured networks. The also showed very different temperature dependence for group conversion. polymerization rate DMA increased when number oxyethyl units from four six, but decreased spacer length further increased. exponential factors on CQ concentration all smaller 0.5. Below 70°C, maximum temperature, yielded apparent activation energies between 10.3–11.6kJ/mol. At temperatures >80°C, reduced improved suppressed autoacceleration, causing decrease increase temperature.
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