Ming Nie , Liang He , Jinghui Zhang , Xiaoqing Liu , Shuning Liu , Xiaobo Liu , Lifen Tong
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引用次数: 0
Abstract
In the field of precision manufacturing, coefficient of thermal expansion (CTE) serves not only as a critical factor affecting product accuracy but also as a central parameter in thermodynamic system design. In this work, a novel semi-crystalline poly(aryl ether nitrile) block copolymer (PEN(HQ-b-BP)) film was prepared with excellent CTE (about 57 ppm/°C) in large range of 25 °C–275 °C. PEN(HQ-b-BP) performance was modified by regulating molecular chain segment lengths. PEN(HQ-b-BP)-5 % and PEN(HQ-b-BP)-10 % had obvious crystallization peaks in XRD, melting peaks in DSC, and crystal morphology in POM and SEM, which laterally reflect the successful synthesis of PEN(HQ-b-BP). The effects of heat treatment of PEN(HQ-b-BP)-5 % and PEN(HQ-b-BP)-10 % at different temperatures to control the changes of their crystallinity on the properties were deeply investigated. In the case of short molecular chains, the connections between crystalline regions are important. They can substantially increase the tensile strength of the polymer film and significantly reduce the CTE value. For PEN(HQ-b-BP), appropriate temperature treatment can improve the connections between crystalline regions. The tensile strength of PEN(HQ-b-BP)-5 % increased by 70 % from 53 MPa to 90 MPa, and that of PEN(HQ-b-BP)-10 % increased by 78 % from 50 MPa to 89 MPa. Moreover, appropriate temperature treatment facilitates crystal refinement and can effectively reduce the CTE value of the material. The CTE of PEN(HQ-b-BP)-5 % decreased from 51.79 ppm/°C to 46.81 ppm/°C, and that of PEN(HQ-b-BP)-10 % decrease from 49.70 ppm/°C to 47.33 ppm/°C.
期刊介绍:
Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics.
The main scope is covered but not limited to the following core areas:
Polymer Materials
Nanocomposites and hybrid nanomaterials
Polymer blends, films, fibres, networks and porous materials
Physical Characterization
Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films
Polymer Engineering
Advanced multiscale processing methods
Polymer Synthesis, Modification and Self-assembly
Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization
Technological Applications
Polymers for energy generation and storage
Polymer membranes for separation technology
Polymers for opto- and microelectronics.