Method for evaluation of vulcanization characteristics of isobutene-isoprene rubber (IIR)

The work studies vulcanization characteristics of elastomers based on isoprene rubber filled with carbon black N330 and boron nitride (BN). The influence of the boron nitride (BN) concentration on technological, dynamic, physical and mechanical properties of elastomers has been researched. The application of boron nitride for producing rubber with good properties has been considered. With a gradual increase of the inert filler BN concentration up to 35%, a decrease in the curing rate by 33% and polymer cross-link density by 26% is observed. Moreover, the start time of vulcanization increases by almost 300%, the optimal curing time by 200%.

Download Full-text

Strain Softening of Bimodal Isoprene Rubber Vulcanizates

Macromolecular Materials and Engineering ◽

10.1002/mame.202000802 ◽

2021 ◽

pp. 2000802

Author(s):

Fengyi Hou ◽

Zhijie Xia ◽

Yihu Song ◽

Wei Chen ◽

Qiang Zheng

Keyword(s):

Strain Softening ◽

Isoprene Rubber

Download Full-text

Preparation and Vibration Damping Characteristics of Wide Frequency Domain PVMQ/IIR Foam Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.2298 ◽

2012 ◽

Vol 538-541 ◽

pp. 2298-2303

Author(s):

Shi Kai Luo ◽

Guo Fang Ding ◽

Jing Li Li ◽

Yan Song Sha ◽

Qing Min Cheng ◽

...

Keyword(s):

Frequency Domain ◽

Wide Temperature Range ◽

Damping Ratio ◽

Vibration Damping ◽

Simple Equation ◽

Structural Damping ◽

Damping Characteristics ◽

Damping Materials ◽

Foaming Technology ◽

Isoprene Rubber

In this paper, we prepared foaming silicon rubber (PVMQ) /isobutylene-isoprene rubber (IIR) composites with chemical foaming technology. The DMA tests results showed that these foaming materials have effective damping characteristics in a wide temperature range. With the special vibrator, we found that the PVMQ/IIR foams that we prepared were the damping materials which has wide frequency domain, because they can keep high damping ratio in a wide frequency domain. When the preloading was between 1.0 mm and 1.7 mm, the structural damping did not change obviously. According to tests, we found that the damping ratio of these foams was fit to the simple equation .

Download Full-text

Liquid phase decomposition of vulcanized isoprene rubber

Materials Today Communications ◽

10.1016/j.mtcomm.2021.102632 ◽

2021 ◽

pp. 102632

Author(s):

Daisuke Yamashita ◽

Takumi Toda ◽

Fumiteru Nishiura ◽

Masahiro Hojo ◽

Hideyuki Tagaya

Keyword(s):

Liquid Phase ◽

Phase Decomposition ◽

Isoprene Rubber

Download Full-text

Effect of Plasticization of Isoprene Rubber on the Fatigue Endurance of its Vulcanizates

Kauchuk i Rezina ◽

10.47664/0022-9466-2021-80-2-54-58 ◽

2021 ◽

Vol 80 (2) ◽

pp. 54-58

Author(s):

V.P. Dorozhkin ◽

◽

E.G. Mokhnatkina ◽

D.N. Zemsky ◽

A.D. Valiev ◽

...

Keyword(s):

Fatigue Endurance ◽

Isoprene Rubber

Download Full-text

Mechanodestruction of Isoprene Rubber. Part 1. Process Kinetics

Kauchuk i Rezina ◽

10.47664/0022-9466-2021-80-3-118-122 ◽

2021 ◽

Vol 80 (3) ◽

pp. 118-122

Author(s):

V.P. Dorozhkin ◽

◽

E.G. Mokhnatkina ◽

D.N. Zemsky ◽

A.D. Valiev ◽

...

Keyword(s):

Experimental Data ◽

Molecular Mass ◽

Rate Constants ◽

Oxidative Destruction ◽

Process Kinetics ◽

Mass Fractions ◽

Rubber Part ◽

Kinetics Of ◽

Selection Of ◽

Isoprene Rubber

A method is proposed that allows us to obtain the values of the rate constants (CR) of the processes of mechanodestruction (mechanical cracking) of kм, oxidative destruction of kо, and recombination of kр macromolecules, as well as the mass fractions of the corresponding fractions of φм, φо, and φр,r involved in the plasticization process (P) of SKI-3 isoprene rubber. The method is based on the selection of the values of these parameters that correspond to the previously obtained experimental data, using the previously obtained recurrent equations and a specially developed program. The dependences of the CR on the time P at 30oC are obtained, which allows us to describe the kinetics of the processes accompanying P at this temperature, and the changes in molecular mass (MM) in this process. It is shown that constant values of CR are established at large times of P. Refined explanations of the nature of the kinetics of the CR change at P are proposed. The MM value of SKI-3 macromolecules that have not undergone destruction is calculated, depending on the time of plasticization.

Download Full-text