Construction of an in situ interfacial layer for aramid fiber reinforced styrene butadiene rubber composites

Abstract

In this work, the in situ interface layer composite was prepared by using the coating agent dispersion. Aramid fiber (AF) was modified with lithium chloride aqueous solution, and then coated with the blends of a low‐molecular weight maleated polybutadiene liquid rubber (MLPB), the epoxy resin (E51), and 2‐ethyl‐4‐methylimidazole (2E4MZ). The in situ interface layer was formed via the reaction of epoxy group with anhydride group in the presence of the accelerator 2E4MZ and covulcanization of MLPB with styrene butadiene rubber (SBR) in the process of preparing vulcanized AF reinforced SBR. It can be seen from analysis of scanning electronic microscopy, attenuated total reflection Fourier transform infrared, and thermogravimetric analysis that the in situ interfacial layer was a uniform and dense interfacial layer on the fiber surface and was not be destroyed during processing. The results of the dynamic mechanical analysis and mechanical properties showed that the in situ interface layer formed in processing had higher flexibility and better integrity than the interface layer prepared before processing, which is favorable for stress relaxation, and the in situ interface layer imparts better tensile strength and tear strength to the composite. The 100% modulus of composites with in situ interface layers was 14.6% higher than that of composites prepared without uncoated AF.

The reinforcement of styrene butadiene rubber composites with simple environmentally friendly aramid fiber modification

“…The master batch obtained in this way, the fiber was evenly dispersed in it. [14,15] Thus, according to the formula listed in Table 3, the material consisting of the master batch was mixed with 200 g SBR-CB (containing 100 g CB) using a two-roll mill (XK-160-A, each roller had a diameter of 160 cm, length of 320 cm, and speed ratio of 1:1.22), and the obtained gross rubber was placed for 24 h to eliminate the internal stress of the rubber. [16] Finally the rheometer (M2000FAN, High Speed Rail Technology Co. Ltd., China) was used to determine cure time (tc90) at 150 C, and the gross rubber was cut into a mold-sized template, placed in the mold, and formed it in a press vulcanizer (XLB, 25 t, Jiangdu Pearl Experiment Machine Factory, China) at 150 C for the standard Tc90.…”

Hybrid enhancement of silica and aramid pulp on improving performance and reducing dynamic heat generation of natural rubber composites

“…21,22 However, aramid fiber is a rigid material and the surface of aramid fiber is chemically inert and poorly combined with the matrix material. [23][24][25] When subjected to alternating stress, aramid fiber will produce friction with rubber molecular chains and particles in the rubber matrix, causing a lot of heat. Therefore, aramid fiber is necessary to be modified in order to reduce the dynamic heat generation of rubber composites.…”

Reducing dynamic heat build‐up of styrene butadiene rubber/carbon black by filling aramid pulp coated with natural rubber latex

“…Compared with SBR/CB filled with high content of CB, a flexible interface layer was constructed on the fiber surface, which was mainly composed of natural rubber not filled with CB with low heat build‐up. It can be co‐vulcanized with matrix SBR rubber to obtain a well‐bonded interface layer 26 . This article tried to apply this coated AP to replace a part of CB in rubber, which provides a new idea for the development of low thermal rubber materials.…”

“…It can be co-vulcanized with matrix SBR rubber to obtain a well-bonded interface layer. 26 This article tried to apply this coated AP to replace a part of CB in rubber, which provides a new idea for the development of low thermal rubber materials.…”