Crystalline Amphiphilic (Maleanilic acid-ran-styrene) Copolymers: Structural and Kinetic Properties

Abstract

A series of amphiphilic (maleanilic acid-ran-styrene) copolymers composed of hydrophobic and hydrophilic moieties were prepared by radical copolymerization using different molar feed ratios of maleanilic acid and styrene. The obtained copolymers were structurally examined by FT-IR, TGA, XRD, and SEM. The weight average molecular weight (M w ) was determined by light scattering method in DMSO and found to lie in the range of 20,000-334,000 g=mol depending upon the molar feed ratio of the maleanilic acid and styrene monomers. The reactivity ratios and Q-e scheme values for the copolymerization process showed a random arrangement of repeating units. The corresponding activation energies for the degradation process (E a,d ) for maleanilic acid and styrene fractions in the copolymer were determined from the TGA data and found to be 57.1 and 89.5 kJ=mol, respectively. The SEM and XRD data show that these copolymers exhibit a rigid rock-like texture with different degree of percent crystallinity. The hydrophilic moiety (ÀCOOH) in these copolymers was found to play a crucial role in determining their crystallinity and textural morphology. The implication of the presence of the hydrophobic and hydrophilic groups in close proximity is discussed.

Two-Dimensional Texture of Intrinsic Conductive Poly(styrene-co-maleanilic Acid) Grafted with Polyaniline: Formation and Conductivity

“…The synthesis and structural characterization of poly(S-co-MA) copolymer backbone have been described in detail elsewhere [51]. Kinetic and thermal studies of this copolymer showed that the constituting styrene and maleanilic acid monomers are randomly arranged in the copolymer backbone.…”