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Assessing effects of ultraviolet ageing on the thermal properties and thermal degradation kinetics of long glass fiber‐reinforced polyamide 6 composites filled with zinc oxide
Author(s) -
He Weidi,
Guo Xincheng,
Wang Na,
Chen Shaopeng,
Chen Xiaolang,
Guo Jianbing,
Zhang Kun,
Wei Tao
Publication year - 2019
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.25327
Subject(s) - materials science , composite material , polyamide , ultimate tensile strength , thermal stability , glass fiber , ultraviolet , glass transition , zinc , ageing , kinetics , degradation (telecommunications) , thermogravimetric analysis , activation energy , izod impact strength test , scanning electron microscope , polymer , chemical engineering , chemistry , telecommunications , physics , optoelectronics , organic chemistry , quantum mechanics , biology , computer science , engineering , metallurgy , genetics
In this work, the effects of ultraviolet (UV) ageing on the thermal stability, mechanical properties, and thermal degradation kinetics of long glass fiber‐reinforced polyamide 6 (PA6/LGF) composites filled with zinc oxide (ZnO) are analyzed. The composites with different contents of ZnO expose in the UV radiation of the wavelength of 340 nm for 0 to 800 h. An increase in tensile strength and a decrease in impact strength are observed with longer ageing time while samples filled with ZnO have a higher retention rate of tensile and impact strength after long time ageing. The morphology of the impact fractures of aged and unaged samples obtained by scanning electronic microscopy shows nearly no difference. Then the thermal stability and degradation kinetics of the samples with different filler fraction and different ageing time are investigated by thermal gravimetric analysis with the methods of Kissinger, Friedman, and Flynn‐Wall‐Ozawa in the dynamic measurements (10‐40°C/min). Calculated apparent activation energy ( E ) values by the three methods show that the samples filled with 6 wt% ZnO have a slightly lower value of E than PA6/LGF composites and nearly no change after longtime UV irradiation.