Synthesis and low-temperature curing behavior of weather-resistant saturated polyester resin suitable for coating for thermosensitive substrates

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-04-28 DOI:10.1016/j.polymertesting.2025.108830

Mingming Guo , Weiming Zhou , Futao Chen , Yong Wang , Zongqian Wang

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Abstract

A novel carboxyl-terminated polyester resin was strategically synthesized as an advanced coating matrix for composites. The resin was engineered through high-temperature melt esterification of neopentyl glycol with terephthalic acid, followed by acid-end capping using isophthalic acid and adipic acid, and finally vacuum-assisted polycondensation. Comprehensive characterization via FTIR, XRD, and TGA validated its structural integrity and thermal resistance, exhibiting a glass transition temperature of 52.2 °C and 5 % weight loss at 370 °C. More importantly, as a composite coating material, the resin demonstrated exceptional processing compatibility with thermosensitive PE/wood plastic composites, achieving a durable curing temperature at 140 °C, while maintaining substrate dimensional stability (with length and thickness variations of 0.24 % and 2.89 % respectively). The cured coating exhibited outstanding performances: 95.2 % curing degree, perfect adhesion (Grade 0), and 55.1 % gloss retention after 240-h UV aging, confirming its superior weatherability. Such work establishes a theoretical and experimental foundation for implementing coating in low-temperature-curable composites.

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适用于热敏性基材涂层的耐候饱和聚酯树脂的合成及其低温固化性能

战略性地合成了一种新型的端羧基聚酯树脂，作为一种先进的复合材料涂层基质。该树脂采用新戊二醇与对苯二甲酸高温熔融酯化反应，然后采用二苯二甲酸和己二酸进行酸端旋盖，最后进行真空辅助缩聚。通过FTIR、XRD和TGA的综合表征验证了其结构完整性和耐热性，其玻璃化转变温度为52.2°C，在370°C时失重5%。更重要的是，作为复合涂层材料，该树脂与热敏PE/木塑复合材料表现出优异的加工相容性，在140°C下实现持久的固化温度，同时保持基材尺寸稳定性（长度和厚度变化分别为0.24%和2.89%）。固化后的涂层表现出优异的性能：固化度95.2%，附着力完美（0级），经过240 h的UV老化后，光泽度保持在55.1%，证实了其优越的耐候性。为低温固化复合材料涂层的实现奠定了理论和实验基础。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.