Structure of poly (methyl methacrylate) synthesized under high pressure

摘要

High-pressure polymerization process of ethylene was discovered in 1933 by Fawcett and Gibson [1]. They obtained polyethylene (density: 0.91 g/cm~3) [2] when they tried to combine ethylene with benzaldehyde under pressures of 0.1 to 0.2 GPa at temperatures below 170 ℃ [1]. In 1953, high density polyethylene (density 0.96 g/cm~3) [2] was synthesized using Ziegler catalyst [3]. The high density polyethylene has a linear structure, whereas the low density polyethylene has a branched structure.