標題: 液晶共聚酯高分子與聚芳香酯高分子之相容性
Miscibility of Liquid Crystalline Copolyester and Polyarylate
作者: 田宏隆
Tyan, Horng-Long
韋光華
Kung-Hwa Wei
材料科學與工程學系
關鍵字: 液晶共聚酯高分子;聚芳香酯高分子;容液摻合;poly(p-oxybenzoate-co-p-phenyleneisophthalate) (HIQ);polyarylate (PAr);solution blending
公開日期: 1995
摘要: 本實驗是利用掃描式熱分析儀(DSC)及偏光顯微鏡(POM)來研究液晶
共聚酯高分子(Poly(p-oxybenzoate-co-p-phenyleneisophthalate),
HIQ)與聚芳香酯高分子(poly-arylate, PAr)間的相容性. 其摻合物採用
solution blending 方式, 以50/50 phenol/tetrachloroethane 之混合
溶劑來製備. 從熱分析結果得知,當 HIQ 的含量低於40% 時,其熱分析曲
線僅出現單一Tg點;而當HIQ的含量大於等於40%時,於熱分析曲線中則出現
兩個Tg點,其中較低溫之Tg點則維持於138℃,不受成分之影響而改變,而較
高溫之Tg點則從HIQ含量為40%時,為183℃降低至HIQ含量為80%時,為173℃
且其間之相容性隨HIQ含量之提高而逐漸之增加. 而HIQ/PAr(60/40)之摻
合物在高於HIQ之Tm點以上315℃持溫時,在數分鐘內此摻合物由部份相容
變為完全相容之摻合物,可由單一Tg點來證實之;而此摻合物相容性之增加
乃是因HIQ與PAr間具有反應發生,可由核磁共振儀(NMR)得知,且反應初期
是由HIQ內之HQ單位先參與反應而接於PAr上,隨後HBA及IA單位才加入反應
而接於PAr上,此外HIQ/PAr(60/40)摻合物之相容性亦可從偏光顯微鏡(
POM)照片中,anisotropic的液晶相,明顯的隨持溫時間增加而逐漸轉變為
isotropic相. 而摻合物的極限黏度有隨持溫時間而增加,然尚待證實及解
釋.
The miscibility of blends of liquid crystalline copolymer of
poly(p-oxybenzoate-co-p-phenyleneisophthalate) (HIQ) with
polyarylate (PAr) has been investigated with differential
scanning calorimetry (DSC). HIQ/PAr blends were prepared by
solution blending of both polymers in a mixed solvent of 50/50
phenol/tetrachloroethane. The phases in blends have been studied
with polarizing microscopy (POM). A single glass transition
temperature was obtained for the HIQ/PAr blends when the weight
ratio of HIQ/PAr in these blends was less than 40%. Two glass
transition temperatures were obtained when the weight ratio of
HIQ in these blends was larger than or equal to 40%. The lower
glass transition temperature around 138℃ remains almost
changed, but the higher glass transition temperature decreased
from 183℃ to 173℃ as the weight ratio of HIQ increasing from
40% to 80%. Annealing blends of HIQ/PAr at 315℃ for a few
minutes, reaction occurred as confirmed by Nuclear Magnetic
Resonance (NMR) spectroscopy. It was found that the HQ in HIQ
reacted with PAr in 3 min, and then HBA and IA reacted with PAr
after 6 min's annealing from both proton and carbon NMR. The
fact that the intrinsic viscosity of HIQ/PAr blends increased
with annealing time needs to be reconfirmed and explained.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT840159005
http://hdl.handle.net/11536/60179
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