We demonstrate a method to prepare high glass-transition-temperature (Tg) materials with a two-step process - anionic copolymerization of α-methylstyrene with styrene (leading to copolymers referred to as SAMS), with subsequent catalytic hydrogenation. The product, poly(cyclohexyl ethylene-co-2-cyclohexyl propylene), is referred to as PCEPx, where the subscript denotes the molar percentage of 2-cyclohexyl propylene units in the copolymer. PCEPx exhibits Tg values between 140 and 178 °C depending on the composition and composition distribution in the polymerization product. To increase the toughness of PCEPx, we copolymerized SAMS with butadiene followed by hydrogenation to form PCEPx/PEEy block copolymers, where PEEy refers to poly(ethylene-co-ethyl ethylene), and γ denotes the molar percentage of ethyl ethylene segments. Tg values as high as 162 °C were achieved for these block copolymers.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of Polymer Science, Part B: Polymer Physics|
|State||Published - Apr 1 2003|
- Block copolymers
- Glass transition
- Poly(cyclohexyl ethylene-co-2-cyclohexyl propylene) (PCEP)