本研究利用微分掃描熱卡計(DSC)、偏光顯微鏡(POM)、掃描式電子顯微鏡(SEM)與傅立葉紅外線光譜儀(FT-IR)來探討poly(vinyl methyl ether) (PVME)或poly(vinyl ethyl ether)(PVEE)與一系列polymethacrylates或polyacrylates之摻合系統中，因側鏈結構變化會對相容性與相型態有何影響。其中Poly(ethyl methacrylate) (PEMA)/PVME系統的相型態深受溶劑影響而有所不同，雖然系統為單一玻璃轉移溫度(glass transition temperature，Tg)，但Tg寬度範圍寬廣得知系統處於互容邊緣，經FT-IR亦證實分子間作用力微弱或並無特殊作用力存在，與熱分析結果相符。Poly(n-propyl methacrylate)(PnPMA)/PVME與poly(isopropyl methacrylate)(PiPMA) /PVME在室溫下為相分離，然而隨著升溫至較高溫度會轉變為均相型態，且其相型態轉變具有可逆性，存在著少見之UCST (upper critical solution temperature)行為。如果改變PVME之側鏈甲基為乙基，即PVEE，polymethacrylates與PVEE室溫下皆為相分離，而在polyacrylates系列中，poly(n-butyl acrylate)(PBA)/PVEE之相型態為均相且為單一Tg，Tg寬度範圍狹宰，為一相容系統，而其他poly(methyl acrylate)(PMA)、poly(ethyl acrylate)(PEA)及poly(n-propyl acrylate)(PPA)與PVEE則皆呈現相分離。

　　Effect of the side-chain structure on the miscibility and morphology of poly(vinyl methyl ether)(PVME) and poly(vinyl ethyl ether)(PVEE) with homologous series of polymethacrylates or polyacrylates were investigated by using differential scanning calorimeter (DSC), polarized-optical microscopy (POM), scanning electron microscopy (SEM) and Fourier transform infrared spectrometer (FTIR) in this study. In poly(ethyl methacrylate)(PEMA) /poly(vinyl methyl ether)(PVME) blend, solvents strongly affect the morphology and lead to different phase structures of the blends. Although blend system shows a single glass transition temperature, the broadening of the glass transition suggests a marginal miscibility. According to FT-IR the intermolecular interactions are weak and not specific, which is in agreement with the glass transition behavior of the blends. Poly(n-propyl methacrylate)(PnPMA)/PVME and poly(isopropyl methacrylate)(PiPMA) /PVME blend system are immiscible at ambient temperature but actually could become miscible at higher temperatures, exhibiting an interesting and rare UCST phenomenon. If changing the methyl group of the PVME’s side chain into ethyl group, PVEE, the polymetharyltes/PVEE blend are immiscible. In homologous polyacrylates, poly(n-butyl acrylate)(PBA)/PVEE blend system shows homogeneous phase and exhibits a single Tg, indicating a miscible system. Additionally, this study also shows that PVEE is immiscible with any other polyacrylates, such as poly(methyl acrylate)(PMA), poly(ethyl acrylate)(PEA) and poly(n-propyl acrylate)(PPA).

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