Anti-plasticization of polymethylmethacrylate

Thermal Expansion Behavior of Antiplasticized Polycarbonate

“…Therefore, β -relaxation of an amorphous polymer, i.e., local relaxation mode, is strongly affected by an antiplasticizer, because the mobility in a local mode is suppressed by loss of the free volume. This anomalous but well-known behavior has been reported for various polymers including poly(vinyl chloride), [17][18][19] poly(methyl methacrylate), 15,18,24) and cellulose esters. 18,26,27) PC is also known to show antiplasticization when combined with various materials.…”

“…11) To counter this normal behavior of plasticization, additives known to enhance the modulus are used, which is called antiplasticization. According to previous studies, 3,[15][16][17][18][19][20][21][22][23][24][25][26][27] the decrease in the free volume is believed to be the origin of the modulus enhancement. Therefore, β -relaxation of an amorphous polymer, i.e., local relaxation mode, is strongly affected by an antiplasticizer, because the mobility in a local mode is suppressed by loss of the free volume.…”

“…15) Because of the enlarged free volume, the modulus decreases and the thermal expansion increases. 11) To counter this normal behavior of plasticization, additives known to enhance the modulus are used, which is called antiplasticization.…”

Mechanical properties of antiplasticized polymer nanostructures

“…Enhancement of elastic moduli and depression of T g in antiplasticized bulk PMMA In the bulk, PMMA/TCPP blends exhibit the defining traits of an antiplasticized system: at low additive concentrations, the elastic modulus of the blend increases while T g decreases. [2][3][4] In Fig. 1, we plot the elastic modulus and T g of bulk PMMA/TCPP blends as a function of TCPP content.…”

“…Some systems, however, exhibit specific interactions that increase E (while decreasing T g ) relative to that of the pure polymer. [2][3][4][5][6][7][8][9][10] The nature of these antiplasticizing interactions is poorly understood, but recent simulations suggest that antiplasticization occurs through an increase in the polymer's packing efficiency at low additive concentrations. 5,7,10 Organic polymers are typically fragile, structurally frustrated materials, 11,12 and an improvement in packing efficiency leads to a stiffer glass 10 and stronger glass formation.…”