Applied Chemistry for Engineering, Vol.22, No.1, 109-113, February, 2011
Silicone 변성 말레화 PE/HDPE/CNT Composite의 제조와 PTC 특성
Preparation and PTC Characteristics of Silicone Modified Maleated PE/HDPE/CNT
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초록
α,ω-Hydroxypropylpoly(dimethylsiloxane)은 α,ω-hydrogenpolydimethylsiloxane을 allyl alcohol과 반응시켜 제조하였으며 이를 말레화 PE에 그라프트 시켜 MPE-g-PDMS 공중합체(MPES)를 제조하였다. MPES와 HDPE 및 4-ethoxybenzoic acid로 표면처리 된 MWCNT를 internal mixer에 가하고 180 ℃에서 compounding하여 MPES/HDPE/EtO-CNT 복합체를 제조하였다. 열적특성을 측정한 결과 표면처리 된 CNT의 함량을 10에서 20 wt%로 증가시켜 제조한 MPES/CNT 복합체의 Tm은 132에서 131 ℃로 약간 감소되었고 MPES/EtO-CNT 복합체의 경우 EtO-CNT의 함량을 10에서 20 wt%로
증가시킴에 따라 130에서 129 ℃으로 약간 감소되었다. 또한 EtO-CNT를 사용하여 제조한 복합체의 경우 120 ℃에서 전기저항이 급격하게 증가되어 PTC 현상이 나타났으며 또한 EtO-CNT의 함량을 10 wt%로 하여 제조한 복합체의 PTC intensity가 1.9로 가장 높게 나타났다.
α,ω-Hydroxypropylpoly(dimethylsiloxane) was prepared from the reaction of a α,ω-hydrogen polydimethylsiloxane with an allyl alcohol. MPE-g-poly(dimethylsiloxane) copolymer (MPES) was prepared from the graft copolymerization of MPE with α,ω-hydroxypropyl group terminated PDMS. MPES/HDPE/EtO-CNT need to varify was prepared from the compounding of MPES, HDPE, and surface treated MWCNT with 4-ethoxybenzoic acid at 180 ℃. Melting point of the
MPES/HDPE/EtO-CNT composite was decreased from 130 to 129 ℃ as increasing the content of MWCNT 10 to 20 wt% in the composite PTC characteristic of the MPES/HDPE/EtO-CNT composite was appeared at 120 ℃ as abruptly increasing the electrical resistivity at this temperature. The heighest PTC intensity of MPES/HDPE/EtO-CNT compsite at 10 wt% loading of EtO-CNT was 1.9.
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