D.O.P系P.V.Cの溶接性に関する研究

Abstract

By adding a plasticizer to rigid high polymer, we can improve the softness, elasticity, workability, adhesive property, etc. according to the purpose of use, and thus the plasticizer is applied artificially to produce excellent plastics. Therefore, much effort has been made to investigate the effects of the plasticizer and to clarify its mechanism.The author carried out experimental research on weldability of plasticized polyvinylchloride in order to further investigate the possibility to apply polyvinlychloride to a welded structure as a strength member, and the author obtained the basic data as stated below.1) In both cases of plasticized P.V.C and welded specimens, increase of brittleness and decrease of impact strength were recognized around 10-20 p.h.r, but at low temperature the welded specimens had not their impact strength decreased.2) The proper kind of plasticized P.V.C, selected according to the purpose of use, is effective and also improves tensile strength, absorbed energy, etc. As for the weldment, the one to which 5-10 p.h.r is annexed is good.3) An abnormality caused by slightly plasticized P.V.C was also found in the welded specimens.4) Heat degradation was only recognized in plasticized P.V.C.5) The effect of load velocity on the tensile strength of plasticized P.V.C was clarified.6) Stress-relaxation phenomenon of plasticized P.V.C and welded specimens becomes more remarkable in proportion to the amount of plasticizer.