用于高性能电介质的光活性芴官能化聚丙烯

IF 4.5 3区 工程技术 Q1 CHEMISTRY, APPLIED
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引用次数: 0

摘要

减少聚烯烃对环境的影响是一项艰巨的任务,这不仅是因为聚烯烃在日常用品中无处不在,还因为这些聚合物作为高性能材料被大规模使用,例如在电子和汽车应用中。聚丙烯就属于这种情况,由于其熔化温度高、介质损耗因子极低,在电容器中可作为坚固耐用的高效电介质。目前的挑战是如何提高其低介电系数,以提高能量密度,同时减少生产,从而逐步提高设备的微型化程度。低含量官能化是提高聚丙烯(PP)介电系数的有效途径,同时不会影响材料的机械和热稳定性。最近的研究表明,降低无定形相中链的流动性是保持低含量聚丙烯介电损耗的关键。这可以通过插入咔唑或 N-烷基吡咯基团来实现。本研究分析了芴含量高达 3 摩尔%的聚丙烯-(丙烯-co-9-(十一碳-10-烯-1-基)-9H-芴)的合成、热稳定性和介电强度,这是在紫外线辐射下具有增强热稳定性和交联潜力的另一种聚丙烯材料。初步结果显示,这些材料的相对介电系数(ɛr)高达 3,介电损耗低于 0.005。与咔唑的情况一样,芴单元之间的强π-π堆积改善了热响应、机械响应和介电响应,而且,在适当的后处理辐照条件下,稳定性还可能进一步提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Photoactive fluorenyl-functionalized polypropylene for high-performance dielectrics

Photoactive fluorenyl-functionalized polypropylene for high-performance dielectrics

Reducing the impact of polyolefins on the environment is a difficult task not only because of its ubiquity in everyday items, but also because these polymers are used on a massive scale as high-performance materials, for example in electronics and automotive applications. This is the case for polypropylene that behaves as a robust and efficient dielectric in capacitors as a result of its high melting temperature and very low dielectric dissipation factor. The current challenge is to increase its low permittivity, in order to improve energy density and, at the same time, to contribute to the reduction of production, thus progressively increasing the miniaturization of devices.

Low content functionalisation has been found to be an efficient route to rise the polypropylene (PP) permittivity, without compromising the mechanical and thermal stability of the material. Recent work has shown that decreasing chain mobility in the amorphous phase is key to maintaining dielectric loss into the low level of PP. This has been achieved by inserting carbazole or N-alkyl pyrrole groups. The former increases the Tg due to their characteristic π-π stacking interactions and both enable tailored crosslinking, UV and thermally activated respectively.

The present study analyses the synthesis and thermal and dielectric stabilities of poly-(propylene-co-9-(undec-10-en-1-yl)-9H-fluorene), with fluorene contents up to 3 mol%, as another example of PP grade that has both enhanced Tg and crosslinking potential under UV radiation. Initial results reveal that these materials have a relative permittivity (ɛr) up to 3 and dielectric losses under 0.005. As in the case of carbazole, the strong π-π stacking between fluorene units improves the thermal, mechanical and dielectric responses and also, that further improvement in stability would be possible under appropriate post-processing irradiation conditions.

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来源期刊
Reactive & Functional Polymers
Reactive & Functional Polymers 工程技术-高分子科学
CiteScore
8.90
自引率
5.90%
发文量
259
审稿时长
27 days
期刊介绍: Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.
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