Preparation of Organohydrazide Nucleating Agents and Their Effect on Crystallization Behavior of Polyethylene Terephthalate

LIN Jiang-hua, WU Jing-bo, XIAO Wen-hao, XU Rui-jie, LEI Cai-hong, CHEN Da-hua

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Plastics Science and Technology ›› 2024, Vol. 52 ›› Issue (07) : 125-130. DOI: 10.15925/j.cnki.issn1005-3360.2024.07.027
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Preparation of Organohydrazide Nucleating Agents and Their Effect on Crystallization Behavior of Polyethylene Terephthalate

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Abstract

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 (T c) of PET is increased by 51, 53, 56 ℃, respectively, and the crystallinity (X c) 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.

Key words

Polyethylene terephthalate / Nucleating agent / Crystallinity / Mechanical properties

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LIN Jiang-hua , WU Jing-bo , XIAO Wen-hao , et al . Preparation of Organohydrazide Nucleating Agents and Their Effect on Crystallization Behavior of Polyethylene Terephthalate. Plastics Science and Technology. 2024, 52(07): 125-130 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.07.027

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