scholarly journals Continuous Preparation and Properties of Silica/Rubber Composite Using Serial Modular Mixing

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3118 ◽  
Author(s):  
Lin Zhu ◽  
Yiren Pan ◽  
Xiaolong Tian ◽  
Huaqiao Liu ◽  
Huiguang Bian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Dynamic Mechanical Properties ◽  
Continuous Mixing ◽  
Rubber Composite ◽  
Continuous Preparation ◽  
Serial Process ◽  
Elongation Flow ◽  
Visualization Experiments ◽  
Core Reaction

In order to efficiently prepare high-performance silica/rubber composites for use in the tread of semi-steel radial tires, a serial modular continuous mixer was designed according to the principle of modular functionalization. The modular structure and serial process helped control the accuracy of the silanization reaction. Synchronous four-wing serrated rotors and reverse meshing reaction mixing twin-rotors utilized shear flow and elongation flow to improve the dispersion. In this paper, the mechanism of serial modular continuous mixing was analyzed, and the influence of the core reaction mixing zone (various mixing elements) on silica-filled compounds was investigated by cooling visualization experiments, including dispersion, and the silanization reaction degree. Meanwhile, a comparative experiment between serial mixing and two-stage mixing was conducted, which showed that the serial process comprehensively improved the dispersion, mechanical properties, and dynamic mechanical properties of silica/rubber vulcanizate.

scholarly journals Surface Modification of Staple Carbon Fiber by Dopamine to Reinforce Natural Latex Composite

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 988
Author(s):  
Xiaolong Tian ◽  
Shuang Han ◽  
Qianxiao Zhuang ◽  
Huiguang Bian ◽  
Shaoming Li ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Performance ◽  
Dynamic Mechanical Properties ◽  
Rubber Matrix ◽  
National Defense ◽  
Rubber Composites ◽  
Rubber Composite ◽  
Thermal And Electrical Properties ◽  
Surface Modified ◽  
Poor Adhesion

Carbon fiber significantly enhances the mechanical, thermal and electrical properties of rubber composites, which are widely used in aerospace, military, national defense and other cutting-edge fields. The preparation of a high-performance carbon fiber rubber composite has been a research hotspot, because the surface of carbon fiber is smooth, reactive inert and has a poor adhesion with rubber. In this paper, a high-performance rubber composite is prepared by mixing dopamine-modified staple carbon fiber with natural latex, and the mechanisms of modified carbon fiber-reinforced natural latex composite are explored. The experimental results show that the surface-modified staple carbon fiber forms uniform and widely covered polydopamine coatings, which significantly improve the interface adhesion between the carbon fiber and the rubber matrix. Meanwhile, when the concentration of dopamine is 1.5 g/L and the staple carbon fiber is modified for 6h, the carbon fiber rubber composite shows excellent conductivity, thermal conductivity, and dynamic mechanical properties, and its tensile strength is 10.6% higher than that of the unmodified sample.

Static, dynamic mechanical properties and microstructure characteristics of ultra-high performance cementitious composites

2012 ◽  
Vol 19 (3) ◽  
pp. 237-245 ◽  
Author(s):  
Wenhua Zhang ◽  
Yunsheng Zhang ◽  
Guorong Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
Steel Fiber ◽  
Construction Material ◽  
Dynamic Mechanical Properties ◽  
Fine Aggregate ◽  
Dynamic Impact ◽  
Dynamic Mechanical ◽  
Reactive Powder

AbstractA new type of construction material named ultra-high performance cementitious composite (UHPCC) was developed in order to reduce the production cost and energy consumption of reactive powder concrete (RPC). Six different mixture proportions of UHPCC were designed, and their properties, including workability (slump test), static mechanical properties (compressive strength and flexure strength), and dynamic mechanical properties (dynamic compressive strength, toughness and fracture pattern), were investigated. Finally, the microstructure of the UHPCC was studied. The experiment result indicate that the compressive and flexural strength of UHPCC can reach 150–200 MPa and 15–50 MPa under standard curing conditions, respectively, which is close to RPC200. Besides, the steel fiber has significant improvement on mechanical properties of UHPCC. The dynamic impact test results show that UHPCC has obvious strain rate effects. Besides, UHPCC exhibits excellent properties to resist dynamic impact. The microstructure investigation showed that UHPCC has dense microstructures and very strong bonds of the interfacial transition zone between cementitious paste and fine aggregate steel fiber.

scholarly journals Analysis of effect of modification of silica and carbon black co-filled rubber composite on mechanical properties

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 279-288
Author(s):  
Xuefei Wang ◽  
Lingling Wu ◽  
Haiwen Yu ◽  
Tongliang Xiao ◽  
Huaming Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Abrasion Resistance ◽  
Dynamic Mechanical Properties ◽  
Compression Set ◽  
Filled Rubber ◽  
Rubber Composite ◽  
Before And After ◽  
Filler Dispersion ◽  
Dynamic Loss

Abstract Silica and carbon black (CB) co-filled rubber composite was widely used for tire tread and other rubber products because of combined advantages of binary fillers, such as low hysteresis, good abrasion resistance, and reinforcement. Numerous studies have been focused on the filler–rubber interaction with the aim of obtaining optimum performances. To investigate the effect of modification on properties of rubber composite, modified silica and CB co-filled rubber composite was prepared with a multi-functional silane coupling agent, 2-aminoethyl-2-(3-triethoxysilylpropyl)aminoethyl disulfide (ATD). Such modification significantly enhanced the filler–rubber interaction and improved the filler dispersion. For the modified composites, the state of cure, hardness, tensile strength before and after aging, stress at 300% elongation, tear strength, abrasion resistance, rebound resilience, compression set, temperature rise, and the value of dynamic loss coefficient ranging from −20°C to 80°C were significantly improved, especially with low ATD dosage (3.0 phr). This modification provides an effective route to prepare silica and CB co-filled rubber composites with improved mechanical properties and dynamic mechanical properties.

scholarly journals Improving the Dynamic Mechanical Properties of XNBR Using ILs/KH550-Functionalized Multilayer Graphene

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2800
Author(s):  
Duoli Chen ◽  
Chaoliang Gan ◽  
Xiaoqiang Fan ◽  
Lin Zhang ◽  
Wen Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Dynamic Mechanical Properties ◽  
Interfacial Interaction ◽  
Multilayer Graphene ◽  
Butadiene Rubber ◽  
Functionalized Graphene ◽  
Dynamic Mechanical ◽  
The Matrix ◽  
Modified Graphene

Graphene has been considered an ideal nanoscale reinforced phase for preparing high-performance composites, but the poor compatibility and weak interfacial interaction with the matrix have limited its application. Here a highly effective and environmentally friendly method for the functionalization of graphene is proposed through an interaction between as-exfoliated graphene and (3-aminopropyl) triethoxysilane (KH550), in which 1-butylsulfonate-3-methylimidazolium bisulfate (BSO3HMIm)(HSO4) ionic-liquids-modified graphene was prepared via an electrochemical exfoliation of graphite in (BSO3HMIm)(HSO4) solution, then (BSO3HMIm)(HSO4)-modified graphene as a precursor was reacted with amine groups of KH550 for obtaining (BSO3HMIm)(HSO4)/KH550-functionalized graphene. The final products as filler into carboxylated acrylonitrile‒butadiene rubber (XNBR) improve the dynamic mechanical properties. The improvement in the dynamic mechanical properties of the nanocomposite mainly depends on high interfacial interaction and graphene’s performance characteristics, as well as a good dispersion between functionalized graphene and the XNBR matrix.

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