Preparation and Characterization of Carborane Modified Liquid Fluoroelastomers and the investigation of their properties.

IF 1.8 4区 化学 Q3 POLYMER SCIENCE
Juan Li
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引用次数: 1

Abstract

The preparation of liquid fluoroelastomers that are liquid with excellent mechanical properties remains a challenge. Here, we show a very straightforward method to produce liquid fluoroelastomers by introducing carborane. Carborane-terminated liquid fluoropolymer was synthesized by Steglich reaction of carboxyl-terminated liquid fluoropolymer and 1,7-bis (hydroxy)-carborane. The product is brown, viscous at room temperature and in the semi-solid state. On this basis, HDI Trimer was used as a curing agent to cure liquid fluoroelastomer. Thermogravimetric analysis of the cured products was carried out. The carbon residue rate of the cured product increased from 35% to 58% of the cured product. The results show that the addition of carborane structure can effectively improve the carbon residue rate of liquid fluoroelastomer. The tensile strength, elongation and shore hardness of the cured product were also examined, and the results show that the tensile strength of carborane modified liquid fluorine increased by 463% compared with that before modification, but the elongation at break was reduced by 42%, which was mainly due to the introduction of rigid structure of carborane. At the same time, the solvent resistance test results show that the introduction of carborane structure has little effect on the aviation kerosene resistance and organic solvent resistance of fluororubber, but it can improve its alkali resistance.

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碳硼烷改性液体氟弹性体的制备、表征及性能研究。
制备具有优异机械性能的液态氟弹性体仍然是一个挑战。在这里,我们展示了一种非常简单的方法,通过引入碳硼烷来生产液体氟弹性体。以端羧基液态氟聚合物与1,7-双(羟基)碳硼烷为原料,采用Steglich反应合成端碳硼烷液态氟聚合物。该产品呈棕色,在室温下呈粘性,为半固态。在此基础上,采用HDI三聚体作为固化剂固化液态氟弹性体。对固化产物进行了热重分析。固化产品的残碳率由固化产品的35%提高到58%。结果表明,碳硼烷结构的加入能有效提高液体氟弹性体的残碳率。对固化产物的抗拉强度、伸长率和邵氏硬度进行了测试,结果表明,碳硼烷改性液氟的抗拉强度比改性前提高了463%,但断裂伸长率下降了42%,这主要是由于碳硼烷的刚性结构的引入。同时,耐溶剂性试验结果表明,碳硼烷结构的引入对氟橡胶的耐航空煤油性和耐有机溶剂性影响不大,但能提高氟橡胶的耐碱性。
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来源期刊
Designed Monomers and Polymers
Designed Monomers and Polymers 化学-高分子科学
CiteScore
3.30
自引率
0.00%
发文量
28
审稿时长
2.1 months
期刊介绍: Designed Monomers and Polymers ( DMP) publishes prompt peer-reviewed papers and short topical reviews on all areas of macromolecular design and applications. Emphasis is placed on the preparations of new monomers, including characterization and applications. Experiments should be presented in sufficient detail (including specific observations, precautionary notes, use of new materials, techniques, and their possible problems) that they could be reproduced by any researcher wishing to repeat the work. The journal also includes macromolecular design of polymeric materials (such as polymeric biomaterials, biomedical polymers, etc.) with medical applications. DMP provides an interface between organic and polymer chemistries and aims to bridge the gap between monomer synthesis and the design of new polymers. Submssions are invited in the areas including, but not limited to: -macromolecular science, initiators, macroinitiators for macromolecular design -kinetics, mechanism and modelling aspects of polymerization -new methods of synthesis of known monomers -new monomers (must show evidence for polymerization, e.g. polycondensation, sequential combination, oxidative coupling, radiation, plasma polymerization) -functional prepolymers of various architectures such as hyperbranched polymers, telechelic polymers, macromonomers, or dendrimers -new polymeric materials with biomedical applications
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