Author/Authors :
Takeshita، نويسنده , , Hiroki and Shiomi، نويسنده , , Tomoo and Suzuki، نويسنده , , Takaki and Sato، نويسنده , , Tsukasa and Miya، نويسنده , , Masamitsu and Takenaka، نويسنده , , Katsuhiko and Wacharawichanant، نويسنده , , Sirirat and Damrongsakkul، نويسنده , , Siriporn and Rimdusit، نويسنده , , Sarawut and Thongyai، نويسنده , , Supakanok and Taepaisitphongse، نويسنده , , Varun، نويسنده ,
Abstract :
Miscibility in the blends of poly(ethylene oxide) (PEO) with n-hexyl methacrylate-methyl methacrylate random copolymers (HMA-MMA) and 2-ethylhexyl methacrylate-MMA random copolymers (EHMA-MMA) was evaluated using glass transition and light scattering methods. EHMA-MMA was more miscible with PEO than HMA-MMA. Both blends of PEO with HMA-MMA and EHMA-MMA showed UCST-type miscibility although homopolymer blends PEO/PMMA were predicted to be of LCST-type. This was attributed to an increase in the exchange enthalpy with increasing HMA or EHMA composition in the random copolymer. From the copolymer composition dependence of miscibility the segmental χ parameters of HMA/MMA, EHMA/MMA, EO/HMA and EO/EHMA were estimated using the Flory–Huggins theory extended to random copolymer systems. Miscibility in the blends of branched PEO with HMA-MMA whose HMA copolymer composition was 0.16 was compared with that in the linear PEO blends. The former blends were more miscible with HMA-MMA than the latter one by about 35 °C at the maximum cloud point temperature.
