Preparation of Organohydrazide Nucleating Agents and Their Effect on Crystallization Behavior of Polyethylene Terephthalate
Using benzoyl hydrazide and benzoyl chloride with different end-capping structures,three kinds of organic hydrazide nucleating agents,1,4-dibenzoyl p-phenylhydrazide(BTAD),1,4-bis(4-methylbenzoyl)p-phenylhydrazide(BTAD-CH3)and 1,4-bis(4-tert-butylbenzoyl)p-phenylhydrazide[BTAD-(CH3)3],were prepared by coupling reaction.Their effects on crystallization behavior,mechanical properties and heat resistance of polyethylene terephthalate(PET)were also discussed.The results show that when the addition of nuclearing agents BTAD,BTAD-CH3 and BTAD-(CH3)3 are 1.0%,the crystallization peak temperature(Tc)of PET is increased by 51,53,56℃,respectively,and the crystallinity(Xc)is increased from 18.1% to 26.3%,26.9% and 29.7%,respectively.BTAD-(CH3)3 can further refine the size of PET spherulite and show better nucleation effect.When BTAD-(CH3)3 is added at 2.0%,the bending modulus of PET composites is increased to 2 675 MPa,with an increase of 22%,and the Vicat softening temperature and thermal deformation temperature are increased by 60℃and 10℃,respectively,compared with PET,and the mechanical properties and heat resistance are improved.
国家科技期刊平台
NSTL
万方数据
