Tri-block segmented thermoplastic elastomers of N-(aminohexyl)-N-hexylterephthalamide (6T6M) and functionalised polystyrene: Synthesis, characterization and thermal property

Abstract

Abstract Low molecular weight polystyrene (PSt) containing 1,6-hexamethylenediisocyanate (HMDI) is prepared and used as soft segment. Hard segments (HS) n-(aminohexyl)-n-hexylterephthalamide (6T6M) is prepared and used for the preparation of thermoplastic elastomer. The molecular weight of the copolymer increased by increasing the hard segment content and thereby varied the HS content from 24 to 8 wt%. Inherent viscosity results prove that the synthesized polymer showed expected molecular weight and linear relationship is obtained between inherent viscosity and molecular weight of the copolymer. The 1HNMR spectrum showed expected peak which confirms the product formation. Temperature dependent FT-IR studies of the polymer reveals that the crystallinity of the HS is very high (about 90%) and the hydrogen bonding highly reversible. The thermogravimtric analysis confirms that the polymer is stable upto 420 °C. Differential calorimetric analysis showed two transition namely Tg of soft segment Tm of HS. The XRD analysis confirms the formed material is semicrystalline in nature. Swelling behaviors and solvent resisitivity confirms that the copolymer showed excellent resistivity than the PSt. Therefore the prepared copolymer is highly thermal stable with excellent solvent resisitivity.