Yang Fei, Jing Zhaoyuan, Wang Yingqiu, Jiang Guodong
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2025 Mar 16;18(6):1313. doi: 10.3390/ma18061313.
Two macromolecular photoinitiators, bis(4-benzoylphenyl) malonate (BPMD) and bis(4-benzoylphenyl) 3,3'-(piperazine-1,4-diyl)bis(3-oxopropanoate) (DBPMD), were successfully synthesized from 4-hydroxybenzophenone (4-BP), malonyl chloride, and anhydrous piperazine. Structural characterization using Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (H NMR) confirmed the expected molecular framework. Ultraviolet (UV) absorption spectroscopy revealed that BPMD and DBPMD exhibited enhanced molar extinction coefficients and red-shifted absorption maxima compared to 4-BP. Migration studies in high-density polyethylene (HDPE) demonstrated significantly lower diffusion rates for BPMD and DBPMD than for 4-BP, with DBPMD exhibiting superior photoinitiation efficiency even in the absence of amine-based activators. Photoinitiation performance, photocrosslinking kinetics, and mechanical evaluations indicated that both BPMD and DBPMD enabled efficient UV-initiated crosslinking, leading to improved tensile strength and creep resistance in polyethylene films. These findings highlight the potential of BPMD and DBPMD as advanced photoinitiators for high-performance UV-crosslinked polyethylene systems.
两种大分子光引发剂，双（4-苯甲酰基苯基）丙二酸酯（BPMD）和双（4-苯甲酰基苯基）3,3'-（哌嗪-1,4-二基）双（3-氧代丙酸酯）（DBPMD），由4-羟基二苯甲酮（4-BP）、丙二酰氯和无水哌嗪成功合成。利用傅里叶变换红外光谱（FTIR）和质子核磁共振光谱（H NMR）进行的结构表征证实了预期的分子骨架。紫外（UV）吸收光谱表明，与4-BP相比，BPMD和DBPMD表现出更高的摩尔消光系数和红移的吸收最大值。在高密度聚乙烯（HDPE）中的迁移研究表明BPMD和DBPMD的扩散速率明显低于4-BP，即使在没有胺基活化剂的情况下，DBPMD也表现出优异的光引发效率。光引发性能、光交联动力学和力学评估表明，BPMD和DBPMD都能实现高效的紫外引发交联，从而提高聚乙烯薄膜的拉伸强度和抗蠕变性。这些发现突出了BPMD和DBPMD作为高性能紫外交联聚乙烯体系的先进光引发剂的潜力。
