Journal of the Korean Industrial and Engineering Chemistry, Vol.15, No.2, 176-182, April, 2004
디일렉트로메트리법을 이용한 아세틸렌 말단기를 갖는 과불소 폴리(아릴렌 에테르) 화합물의 경화거동 연구
The Studies on the Curing Behaviors of Perfluorinated Poly(arylene ether) Bearing Acetylenic End Groups by Dielectrometry
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초록
4,4'-(헥사플로로이소프로필리덴)디페놀과 과량의 데카플로로비페닐과의 반응, 그리고 m-에티닐페놀과의 반응을 통하여 사슬 말단에 가교화가 가능한 에티닐기를 갖는 불소화 에테르 올리고머(FPAE-EP)를 합성하였다. 이 FPAE-EP의 수평균 분자량과 다분산도는 각각 7800과 1.79였다. FPAE-EP의 경화거동을 디일렉트로메트리, 시차주사열분석, 적외선 분광분석과 같은 분석법으로 연구하였다. FPAE-EP는 202 ℃ 부근에서 가장 낮은 이온 점도를 보였으며, 이 온도 이후에서 이온점도가 점차 증가하는 경향을 보이는데, 이것은 이 온도 부근에서 가교화반응이 시작되고, 말다 ㄴ아세틸렌 기의 열가속화반응에 의한 분자량 증가를 의미한다. 경화시 재료의 유동성과 밀접한 관계가 있는 loss factor 거동은 이온점도 거동과 매우 유사하였다.
Fluorinated ether oligomer with a crosslinkable ethynyl group at the chain end (FPAE-EP) was synthesized by the reaction of 4,4'-(hexafluoroisopropylidene)diphenol with an excess decafluorobiphenyl, followed by reaction with m-ethynylphenol. The molecular weight (Mn) and polydispersit (Mw/Mn) of FPAE-EP were 7800 and 1.79, respectively. The studies on the curing behaviors of FPAE-EP were performed by such instrumental methods as dielectrometry, differential scanning calorimetry, and FT-IR spectroscopies. The FPAE-EP showed the lowest ionic viscosity around 202 ℃, and then the ionic viscosity was gradually increased up to 271 ℃. This means that the crosslinking reaction of FPAE-EP started at 202 ℃ and the molecular weight was increased by the accelerated thermal crosslinking reaction of the terminal acetylene functions. The loss factor behaviors of FPAE-EP, which is related to the fluidity of matrix, were found to be similar to that of ionic viscosity.
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