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可再生资源制无收缩聚（2-恶唑啉）网络的介电性能

Dielectric Properties of Shrinkage-Free Poly(2-Oxazoline) Networks from Renewable Resources.

作者信息

Blaschke Fabio, Marx Philipp, Hirner Stefan, Mühlbacher Inge, Wewerka Karin, Wiesbrock Frank

机构信息

Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria.

Institute for Chemistry and Technology of Materials, Graz University of Technology, NAWI Graz, Stremayrgasse 9, 8010 Graz, Austria.

出版信息

Polymers (Basel). 2021 Apr 13;13(8):1263. doi: 10.3390/polym13081263.

DOI:10.3390/polym13081263
PMID:33924619
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8070125/
Abstract

In the course of this study, the dielectric and physicochemical properties of poly(2-oxazoline) (POx) networks from renewable resources were compared with those of fossil-based polyamide 12 (PA 12) networks. POx was synthesized by the energy-efficient, microwave-assisted copolymerization of 2-oxazoline monomers, which were derived from fatty acids of coconut and castor oil. For the preparation of composites, aluminum nitride nanoparticles n-AlN and microparticles μ-AlN as well as hexagonal boron nitride BN submicroparticles were used. Additionally, 0, 15, or 30 wt.% of a spiroorthoester (SOE) were added as an expanding monomer aiming to reduce the formation of shrinkage-related defects. For the crosslinking of the polymers and the SOE as well as the double ring-opening reaction of the SOE, a thermally triggered dual-cure system was developed. The fully-cured blends and composites containing SOEs exhibited lower densities than their fully-cured SOE-free analogues, which was indicative of a lower extent of shrinkage (or even volumetric expansion) during the curing reaction, which is referred to as relative expansion RE. The RE amounted to values in the range of 0.46 to 2.48 for PA 12-based samples and 1.39 to 7.50 vol.% for POx-based samples. At 40 Hz, the "green" POx networks show low loss factors, which are competitive to those of the fossil-based PA 12.

摘要

在本研究过程中，将可再生资源的聚（2-恶唑啉）（POx）网络的介电和物理化学性质与化石基聚酰胺12（PA 12）网络的性质进行了比较。POx是通过2-恶唑啉单体的节能微波辅助共聚合成的，这些单体来源于椰子油和蓖麻油的脂肪酸。为了制备复合材料，使用了氮化铝纳米颗粒n-AlN和微米颗粒μ-AlN以及六方氮化硼BN亚微米颗粒。此外，添加0、15或30 wt.%的螺环原酸酯（SOE）作为膨胀单体，旨在减少与收缩相关缺陷的形成。为了使聚合物和SOE交联以及SOE的双开环反应，开发了一种热引发双固化体系。含有SOE的完全固化共混物和复合材料的密度低于其不含SOE的完全固化类似物，这表明在固化反应过程中收缩程度较低（甚至体积膨胀），这被称为相对膨胀RE。基于PA 12的样品的RE值在0.46至2.48范围内，基于POx的样品的RE值在1.39至7.50 vol.%范围内。在40 Hz时，“绿色”POx网络显示出低损耗因子，与化石基PA 12的损耗因子具有竞争力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c11a/8070125/6918a8892a92/polymers-13-01263-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c11a/8070125/da8127ca5e77/polymers-13-01263-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c11a/8070125/d121a7e71d41/polymers-13-01263-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c11a/8070125/6918a8892a92/polymers-13-01263-g015.jpg

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