State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China.
Molecules. 2021 Aug 7;26(16):4788. doi: 10.3390/molecules26164788.
In order to reduce the environmental pollution caused by waste rubber and to realize the recycling of resources, we proposed a facile method for the hydrophilic modification of waste rubber powder (HRP) and used it to reinforce a composite hydrogel. In the presence of toluene, dibenzoyl peroxide (BPO) diffused into the waste rubber powder. After the solvent was removed, BPO was adsorbed in the rubber powder, which was used to initiate the grafting polymerization of the acrylamide monomer on the rubber-water interface. As a result, the polyacrylamide (PAM) molecular chains were grafted onto the surface of the rubber powder to realize hydrophilic modification. The success of the grafting modification was confirmed by FTIR, contact angle testing, and thermogravimetric analysis. The hydrophilic modified waste rubber powder was used to reinforce the PAM hydrogel. Mechanical tests showed that the tensile strength and elongation at the break of the composite hydrogel reached 0.46 MPa and 1809%, respectively, which was much higher than those of pure PAM hydrogel. Such a phenomenon indicates that the waste rubber particles had a strengthening effect.
为了减少废橡胶造成的环境污染并实现资源的循环利用,我们提出了一种简便的废橡胶粉(HRP)亲水改性方法,并将其用于增强复合水凝胶。在甲苯存在的情况下,过氧化二苯甲酰(BPO)扩散到废橡胶粉中。除去溶剂后,BPO 被吸附在橡胶粉末中,用于引发丙烯酰胺单体在橡胶-水界面上的接枝聚合。结果,聚丙烯酰胺(PAM)分子链接枝到橡胶粉末表面,实现亲水改性。接枝改性的成功通过傅里叶变换红外光谱(FTIR)、接触角测试和热重分析得到了证实。亲水改性废橡胶粉用于增强 PAM 水凝胶。力学测试表明,复合水凝胶的拉伸强度和断裂伸长率分别达到 0.46 MPa 和 1809%,远高于纯 PAM 水凝胶。这种现象表明废橡胶颗粒具有增强效果。