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253. Macromol. Mater. Eng. 1/2012

Author

Lu, Ming, primary, Wang, Yiqing, additional, Wu, Youping, additional, Quan, Yannan, additional, Wu, Xiaohui, additional, Zhang, Liqun, additional, and Guo, Baochun, additional

Published
2012
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255. Hydrogen bond-containing oligomer as a facile interfacial mediator in rubber/silica composites

Author

Kong, Shaoxin, Wu, Siwu, Tang, Zhenghai, and Guo, Baochun

Abstract

Silica is one of the most important reinforcements in the rubber industry due to its indispensable applications in green tires. However, the significant difference in polarity between conventional diene rubber and silica generally results in poor silica dispersion and, hence, considerably compromises the overall performance of the composites. Herein, a poly (hydroxyethyl methacrylate) oligomer was synthesized via living radical polymerization using disulfiram as an iniferter. Upon thermal activation, the oligomer can further divide into macroradicals that are capable of directly grafting onto the unsaturated moieties in the rubber skeleton. Therefore, the pendant ester and hydroxyl functionalities can interact with silanol groups on the silica surface through interfacial hydrogen bonding, which significantly improves the interfacial interaction and facilitates the dispersion of silica. Accordingly, incorporating a small amount of oligomer (less than 3.5 wt%) can achieve a remarkable improvement in the tensile modulus and rolling and wet skid resistances of the obtained composites. We envisage that the present reactive oligomer can provide an effective strategy toward in situ modification of the rubber skeleton, which also has significant potential to optimize the static and dynamic performance of rubber/silica composites for tire tread applications.

Published
2023
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300. Microwave Dielectric Properties of CdWO 4 Ceramics Prepared by Using High-energy Ball-milling Method.

Author

Guo, Baochun and Liu, Peng

Subjects
*MICROWAVES, *DIELECTRIC properties, *CERAMICS, *CADMIUM tungstate crystals, *MILLING (Metalwork), *GRAIN size
Abstract

The CdWO4compound was prepared from CdO and WO3mixtures by high energy ball milling method and its microwave dielectric properties have been investigated. After milling 30 h, pure and well-crystallized CdWO4powders with an average grain size of 230 nm were obtained at 125°C. The CdWO4ceramics sintered at 950–1100°C have monoclinic structure belong to the space group P2/c(13), and when sintered at 1025°C, the ceramics exhibited good dielectric constant (ϵr) of ∼ 12.81,Q×fof ∼27000 GHz and τfof ∼−19.3 ppm/°C. [ABSTRACT FROM AUTHOR]

Published
2015
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