“…b) For a thermal gel like HPMC, increasing temperature is favorable for greater interaction between hydrophobic groups and that between hydrophilic hydroxyl groups, thus enhancing the three-dimensional network and increasing the viscosity. Based on this effect (effect B), the viscosity is proportional to temperature and α is a positive value (Qing, Jinsong, Changjiang, Jianpeng, & Shouqin, 2014b). c) For a cooling gel like HPS, a higher temperature causes the breakage of intermolecular hydrogen bonds and thus the three-dimensional network, leading to declined viscosity.…”