Antiplasticization of a polyamide: a positron annihilation lifetime spectroscopy study

PLGA and PHBV Microsphere Formulations and Solid-State Characterization: Possible Implications for Local Delivery of Fusidic Acid for the Treatment and Prevention of Orthopaedic Infections

“…Similar to the T g , enthalpy relaxation is due to short range order that arises in the glassy phase of a polymer matrix and short range order may arise within the matrix during the microsphere formation process (40). The miscible amount of FA within the PLGA matrix of the FA-loaded microspheres may as well have acted as an anti-plasticizing agent reducing the molecular mobility (or free volume) of the PLGA as shown by the increase in both the T r and T g (54,55). Since up to a maximum of 1% FA was miscible in the PLGA matrix, all the FA-loaded microspheres produced the same increase in enthalpy relaxation, T r and T g (Table I).…”

Polymeric mixed matrix membranes containing zeolites as a filler for gas separation applications: A review

“…In that case, the inclusion of small molecules into a polymer raises the rigidity of the material with a subsequent suppression of motions in the polymer chain. Because of that, there are changes in physical properties of the polymeric materials [119,120]. Antiplasticization effect of LMWMs additives, which decreased both the glass transition temperature and gas permeabilities of the polymer.…”

Antiplasticizing effect of MOCA on poly(vinyl chloride)

“…It is very evident that the incorporating of MOCA has resulted in a decrease in the crystallinity of PVC. Therefore, the rise in tensile strength and modulus can not be interpreted as the result of an increase in crystallinity as described by Guerrero [4] in PVC/tricresyl phosphate system.…”

“…However, in low concentration range of plasticizers, the case is sometimes opposite-a significant increase in tensile strength or stiffness is often observed in some glassy polymers such as poly(vinyl chloride), [1] polycarbonate, [2] polysulfone, [3] polyamide, [4] etc. The anomalous phenomenon has been termed antiplasticization.…”