HE Changfu1, JIANG Guojian1, SHEN Qingyi2, ZHOU Peng1, LUO Jiawen1, TU Tianzhe1, ZHAO Qiancheng1, SONG Hui1, LIU Siyu1
(1. College of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 2. Department of Prosthodontics, Shanghai Stomatological Disease Center, Shanghai 200031, China)
Abstract: In order to overcome large amounts of organic matter in the gelcasting process for acrylamide system (PAM), serious pollution of preparation process and the higher curing temperature, carboxyl methyl cellulose - methyl methacrylate graft copolymer (CMC-g-PMMA) was synthesized to replace the original acrylamide system. The differences in viscosity, zeta potential and sedimentation height between CMC-g-PMMA and PMA systems were studied. The optimum process parameters in CMC-g-PMMA system were determined.The morphology and microstructure of the green body and sintered body were characterized. The results show that the strengths of the body and sintered body of the CMC-g-PMMA system were higher than those of the PMA system. The strength of the body was increased from 31.55 MPa to 37.58 MPa, and the strength of the sintered body was increased from 350.86 MPa to 452.18 MPa, up by 1/5 and nearly 1/4,respectively. The processing properties of the body were improved and the strength of the sintered body was increased.
Key words: gel injection molding; CMC-g-PMMA; in situ polymerization; defect control