z-logo
open-access-imgOpen Access
Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer
Author(s) -
Yuan-Jin Pang,
Wenshuai Xu,
Ben-Tengzi Yang,
HaiYing Ni,
Jun Chen
Publication year - 2021
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.210034
Subject(s) - polyoxymethylene , crystallinity , differential scanning calorimetry , copolymer , materials science , crystallization , fourier transform infrared spectroscopy , crystal (programming language) , amorphous solid , polymer chemistry , composite material , polymer , crystallography , chemical engineering , chemistry , organic chemistry , thermodynamics , physics , computer science , engineering , programming language
Thermal-oxidative ageing of polyoxymethylene (POM) copolymer in the oven at 100°C for 1, 2, 3, 5, 7, 10, 14 and 21 days and the influence of early thermal-oxidative ageing on POM structure and properties were studied by means of wide-angle X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry and tensile test. Based on the results, we found that the early thermal-oxidative ageing of POM copolymer can be divided into three regions. The region I is the initial 3 days. In this region, some molecular chains rearranged, resulting in internal stress relaxation, increase of crystallinity degree and grain size due to the perfection of crystal structure; both extended chain crystal (ECC) and folded chain crystal (FCC) increased and ECC grew faster than FCC. The region II is from 3 days to 10 days, and in this region, chain scission took place in amorphous region and led to chemi-crystallization. The region III is after 10 days. In this region, the structure and performance of POM copolymer reached a stable situation at this stage. In this work, the difference between skin and core were also analysed.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here