Mixed monolayers of pmas with poly(styrene‐b‐methyl methacrylate) at the air/water interface

Abstract

Poly(methyl methacrylate) (PMMA) is known to be immiscible with poly(styrene) (PS) in the bulk state. Poly(ethyl methacrylate) (PEMA), poly(propyl methacrylate) (PPMA), and poly(n‐butyl methacrylate) (PBMA) are also known to be immiscible with PMMA (or PS). Therefore, PMAs (PMMA, PEMA, PPMA, and PBMA) are predicted by the mean field theory to be immiscible with poly(styrene‐b‐methyl methacrylate) (PS‐b‐PMMA) in the bulk state. However, the miscibility of PMAs with PS‐b‐PMMA may be different in the two‐dimensional state. Therefore, the mixed monolayer behavior of PMAs and PS‐b‐PMMA was investigated from the measurements of surface pressure‐area per molecule (π‐A) isotherms at three different temperatures (10°C, 25°C, and 40°C). Calculation of compressibility from isotherms provided the inflection data from maximum and minimum peaks. The miscibility and nonideality of the mixed monolayers were examined by calculating the excess area as a function of composition. Mostly, negative deviations from ideality were observed in the mixed monolayers. This is likely because of favorable interaction between PMMA and PMAs in the monolayer state. The positive deviations occurred at 40°C with PBMA at a high surface pressure. Therefore, with confinement in the two‐dimensional state, the miscibility between PMAs and PS‐b‐PMMA was greatly improved in comparison with the bulk state. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

Photo‐induced thiol‐ene polysulfide‐crosslinked materials with tunable thermal and mechanical properties

“…For MBrec blend, however, two T g values were observed at 8.2 and 55.6 °C, suggesting immiscible blend of Bsh (PBMA‐rich) and Mene (PMMA‐rich). It is reported that PMMA and PBMA are not miscible . Upon UV irradiation, one T g values were observed for all three blends; −6.3 °C for EBrec, 28.8 °C for BBrec, and even 40.2 °C for MBrec.…”

“…It is reported that PMMA and PBMA are not miscible. 42,43 Upon UV irradiation, one T g values were observed for all three blends; 26.3 C for EBrec, 28.8 C for BBrec, and even 40.2 C for MBrec. Further, the T g values increased from 29.0 to 26.3 C for EBrec and 7.2 to 28.8 C for BBrec.…”