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Effects of in‐situ reactive phenolic resin on shape memory performance of polynorbornene
Author(s) -
Gong Xiaowen,
Yin Hao,
Zhang Maolin,
Lin Zhengwei,
Shi Xinyan
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50143
Subject(s) - prepolymer , materials science , composite material , fourier transform infrared spectroscopy , composite number , thermosetting polymer , differential scanning calorimetry , polymer , dynamic mechanical analysis , ultimate tensile strength , shape memory alloy , melamine resin , shape memory polymer , melamine , polymer chemistry , chemical engineering , polyurethane , physics , engineering , coating , thermodynamics
Abstract In this paper, resorcinol prepolymer (HT1005) in‐situ reacted with hexamethoxymethyl melamine (HMMM, formaldehyde donor) to produce cured phenolic resin to modify polynorbornene (PNB) as a shape memory polymer (SMP). A moving die rheometer (MDR) was used to characterize the crosslinking degree of phenolic resin. Fourier transform infrared spectroscopy, differential scanning calorimeter, universal electronic tensile testing machine, dynamic mechanical analysis and X‐ray diffraction was used to investigated the mechanical properties and shape memory performance of PNB composites. Infrared results showed that HT1005 reacted with HMMM forming a chemical cross‐linking network in PNB. With the increase of HT1005 and HMMM, the phenolic resin network was gradually improved. When stress was applied to the composite, the phenolic resin rigid network first beared part of the external force, which improved the mechanical properties of the composite. When the content of HT1005 was too much, its dispersibility will become poor, and the rigid phenolic resin network will be too dense, which limited the recovery of PNB molecular chains. A small amount of HT1005 will be more uniformly dispersed in the PNB, the strength of the phenolic resin network was moderate, and the composite material had excellent shape memory and mechanical properties.