Lee Ju Hyuk, Jeong Heon Yong, Lee Sang Yoon, Cho Sung Oh
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
Nanomaterials (Basel). 2021 Mar 18;11(3):777. doi: 10.3390/nano11030777.
Nanocomposites comprising high-density polyethylene (HDPE) and boehmite (BA) nanoparticles were prepared by melt blending and subsequently irradiated with electrons. Electron irradiation of HDPE causes crosslinking and, in the presence of BA, generates ketone functional groups. The functional groups can then form hydrogen bonds with the hydroxyl groups on the surface of the BA. Additionally, if the BA is surface modified by vinyltrimethoxysilane (vBA), it can covalently bond with the HDPE by irradiation-induced radical grafting. The strong covalent bonds generated by electron beam irradiation allow the desirable properties of the nanofiller to be transferred to the rest of the nanocomposite. Since EB irradiation produces a great number of strong covalent bonds between vBA nanoparticles and HDPE, the modulus of elasticity, yield strength, and resistance to thermal shrinkage are enhanced by electron irradiation.
通过熔融共混制备了由高密度聚乙烯（HDPE）和勃姆石（BA）纳米颗粒组成的纳米复合材料，随后用电子进行辐照。HDPE的电子辐照会导致交联，并且在BA存在的情况下会产生酮官能团。这些官能团然后可以与BA表面的羟基形成氢键。此外，如果BA用乙烯基三甲氧基硅烷（vBA）进行表面改性，它可以通过辐照诱导的自由基接枝与HDPE共价键合。电子束辐照产生的强共价键使纳米填料的理想性能转移到纳米复合材料的其他部分。由于电子束辐照在vBA纳米颗粒和HDPE之间产生大量强共价键，电子辐照提高了弹性模量、屈服强度和抗热收缩性。
