Studies on interfacial adhesion, tensile and thermal characteristics in blends of polystyrene/novalac resin

Abstract

Specific interactions generate stability of the component parts in blends. Present work aims to elucidate intermolecular interactions in polystyrene/novolac blends by means of Infrared spectroscopic studies. It was found that strong interactions were observed at band 3095 cm À1 assigned to aromatic CÀ ÀH stretching vibrations, at band 2980 cm À1 assigned to aliphatic C-H stretching vibration and at band 1635 cm À1 assigned to C¼ ¼C stretch vibration of aromatic ring system. Maximum interaction was observed in blend consisting polystyrene/novolac (80:20 by parts, in this study it is blend B). Mechanical and thermal properties of the blends were also studied. Tensile strength data was found maximum in blend B. Nonisothermal method of Freeman and Carrol was used to investigate the kinetics of thermal degradation. The reactions were studied by thermogravimetry in nitrogen atmosphere. Decomposition of the blends was found in consecutive stages. The activation energies were determined for each stage of reactions. From thermal studies, blend B was found to be most stable. A degradation mechanism was suggested by compiling the reports of previous authors.

Mesoporous water adsorbent material from poly high internal phase emulsion for agriculture application

“…The similarity of all spectra was evident except for the strong peak at around 770 cm −1 that appeared in the poly(S/EGDMA)HIPEs. This band is assigned to C—H bending vibration connected to aromatic ring (out of plane bending) . Higher intensity of the band resulted from higher polystyrene composition.…”

“…This band is assigned to CAH bending vibration connected to aromatic ring (out of plane bending). 23 Higher intensity of the band resulted from higher polystyrene composition. Also, the increase in polystyrene composition affected the intensity of the carbonyl and ester peaks to the lower intensity corresponding to the decrease in the amount of EGDMA.…”