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남채윤,임도현,정대영,윤호규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
As environmental issues become important to modern society, changes in cable insulating materials are also needed. Polypropylene is used for replacing crosslinked polyethylene which was previously used as insulating materials for cable. XLPE creates environmental by-products during crosslinking process and greenhouse gas but polypropylene don’t need to crosslink and can be recycled after usage time which are great advantages to environment. For high heat-resisting property and flexibility, PP blends that were blended with Styrene ethylene butylene styrene(SEBS) were used and fabricated by melting mixing. Various effects of crystallinity of PP and cooling rate are examined comparing with pure PP. In mechanical properties, the tensile strength was decreased but elongation was increased according to the samples had higher rubber contents. As the SEBS content increased, it shows low degree of crystallinity and the highest breakdown strength at 35 wt.% SEBS content.
남채윤,임도현,양형규,윤호규 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
As environmental issues become important to modern society, changing cable insulating materials is needed. Crosslinked polyethylene as an existing insulating material has environmental problems such as greenhouse gas and by-products which are generated during crosslinking process. Unrecyclable is a huge problem in todays. Polypropylene, different from XLPE, can be recycled after usage time because it is non-crosslinked polymer. It is a big advantage for environment. PP is a crystalline polymer so flexibility is insufficient in itself. For giving flexibility to PP, styrene-ethylene-butylene-styrene is blended with PP and fabricate PP blends by melting mixing. Various effects of crystallinity of PP and cooling rate are examined and compared with pure PP. The results can explain that the crystal size, the degree of crystallinity and the cooling rate can be controlled the breakdown strength of PP/SEBS blends.