日本住友PMMAHT082S--日本住友是日本住友集团旗下的建设机械厂家，是日本zui古老的企业集团之一，拥有400多年历史，在世界范围享有盛誉。在1967年凭借自身技术开发研制了第一台液压挖掘机之后，目前世界各地到处活跃着住友液压挖掘机的身影。
核心公司：三井住友银行、住友金属工业、住友金属矿山、住友化学、住友商事、住友电气工业、住友重机械减速机、日本电气、香港港榆油压设备有限公司、三井住友海上火灾保险、住友林业、住友不动产、三井住友建设、住友信托银行、住友生命保险、大日本住友制药、住友大阪水泥
PMMA manufacturers say that compared with polycarbonate PC, PMMAhas many advantages that the latter does not, such as betteroptical performance and data storage performance, and excellentscratch resistance. They believe that PMMA will regain a largeshare of DVD market from PC, but another manufacturer believes thatif MMA price is not lowered, PMMA will not be able to compete withPC, and the growth rate will not exceed other polymers, such as PEmodified by hexanediol.
After stretching, the molecular chains of the PMMA are biaxiallyoriented and frozen along the plane of the PMMA. Compared with nonstretched plexiglass, the molecular chain of oriented plexiglass isin an orderly orientation, and its tensile strength, bendingstrength, craze resistance, crack growth resistance, modulus,elongation at break and impact strength are all improved. Theimprovement of the above mechanical properties is related to thedegree of stretch. The degree of stretch increases and the extentof performance improvement increases. However, when the degree ofstretch exceeds 50% - 60%, the other properties will not changeexcept the impact strength
