Phase behavior of blends of styrene/maleic anhydride copolymers

Abstract

PPO ) have been determined. Tentative binary interaction energies were evaluated from mapping the copolymer composition miscibility boundaries using the Flory-Huggins theory combined with the binary interaction model. Data on phase-separation temperatures were too sparse for these systems to obtain refined estimates using the Sanchez-Lacombe theory. A negative interaction energy was obtained for the MA/AN pair; however, the MA unit showed strong repulsive interactions with all other monomer units examined here. 0 1994

Miscibility characterization of SMA/SAN and SMA/PMMA blends by differential scanning calorimetry and fluorescence techniques

“…This behavior is a characteristic of miscible blends. For SMA/SAN blends, literature results [19][20][21][22][23] show that these blends are miscible when SMA and SAN contain approximately identical weight percentage of styrene, which is the case in this study. The used Figure 5 presents the evolution of the T g of SMA /SAN-17 and SMA/PMMA blends as a function of SMA weight concentration.…”

“…17,18 For approximately identical weight contents of styrene, it was reported that SMA and SAN are miscible. [19][20][21][22][23] SMA/ SAN systems show the LCST behavior, which is determined by the characteristic single glass transition temperature (T g ) on the DSC curve. It was also reported that SMA and PMMA blends are miscible when the weight fraction of maleic anhydride in SMA is in the range of 8-33 wt %.…”

Interfacial thickness in bilayers of poly(phenylene oxide) and styrenic copolymers

“…More detailed characterizations of the SAN and SMA copolymers have been reported previously. 4,12,24 The perdeuterated PPO was provided by the General Electric Co. 25 The molecular dimensions used in the calculations, taken from the literature, are included in Table I as values of (͗r o 2 ͘(/M) 1/2 , where ͗r o 2 ͘ is the unperturbed mean-square end-to-end distance. 26 -31 Typically, these values were estimated from viscometry or light-scattering measurements made in good solvents and then extrapolated to dimensions corresponding to theta conditions using the techniques of Stockmayer-Fixman or Kurata-Stockmayer.…”

“…This table includes the polymer system investigated, the method of evaluation, and when available, the evaluation temperature. 11,12,[32][33][34][35][36][37][38][39] Three binary interaction energies are required to calculate the PPO/SAN interfacial thickness, namely: B PPO/S , B S/AN , and B PPO/AN . The S/AN interaction has been estimated by various phase behavior observations, all of which report a value of about B S/AN ϭ 7.0 cal/cm 3 .…”

Flow behavior in a corotating twin‐screw extruder of pure polymers and blends: Characterization by fluorescence monitoring technique

“…However, these glass transitions were lower than those of pure SMA8 and PS phases, which indicated a weak interaction between the two phases. As mentioned in literature,29–31 SMA/SAN systems are miscible when SMA and SAN have similar weight percent of maleic anhydride and acrylonitrile comonomers, respectively. In this study, we characterized the miscibility of PMMAEA/PMMA system by DMTA.…”