Ambient moisture influence on the secondary relaxations of epoxy-amine networks with different crosslink densities

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer Pub Date : 2024-11-01 DOI:10.1016/j.polymer.2024.127750

Carolina Helena Franzon, Aurélien Roggero, Sébastien Pruvost, Jean-François Gérard

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Abstract

The molecular mobility of polyepoxy networks synthesized from diglycidyl ether of bisphenol-A (DGEBA) and cured with aliphatic diamines featuring varying polypropylene glycol (PPG) backbone lengths was investigated. The influence of ambient storage conditions, notably absorbed moisture, in conjunction with the network crosslink density on physical properties, was explored by using multiple techniques, including differential scanning calorimetry, dielectric and mechanical spectroscopies. In addition to known effects on glass transition and its dynamic manifestations, significant effects on secondary relaxation modes were observed, further highlighting the importance of controlling initial sample conditions when conducting molecular mobility studies. A bimodal

β

-relaxation was observed in the presence of absorbed moisture as a result of an additional water-related mode,

β_{2}

, ascribed to hydroxyether groups interacting with water.

Abstract Image

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环境湿度对不同交联密度的环氧胺网络二次松弛的影响

我们研究了由双酚 A 的二缩水甘油醚（DGEBA）合成并用具有不同聚丙二醇（PPG）骨架长度的脂肪族二胺固化的聚环氧网络的分子流动性。研究采用了多种技术，包括差示扫描量热仪、介电光谱和机械光谱，探讨了环境储存条件（尤其是吸收的水分）以及网络交联密度对物理性质的影响。除了已知的对玻璃化转变及其动态表现的影响外，还观察到了对次级弛豫模式的显著影响，这进一步突出了在进行分子流动性研究时控制初始样品条件的重要性。在吸收水分的情况下，由于羟醚基团与水相互作用产生了一种与水相关的附加模式 β2β2，因此观察到了双模 β 松弛。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

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.