Surface modification of vulcanized rubber by radiation grafting, part 1: Improvement in friction behavior

2010 ◽  
pp. n/a-n/a
Author(s):  
N. Mizote ◽  
A. Katakai ◽  
M. Tamada ◽  
H. Matsuoka
Keyword(s):  
Surface Modification ◽  
Radiation Grafting ◽  
Friction Behavior ◽  
Vulcanized Rubber

The Effect of Excess Silane-69 Used for Surface Modification on Cure Characteristic and Mechanical Properties of Precipitated Silica Filled Natural Rubber (PSi/NR)

2009 ◽  
Vol 79-82 ◽  
pp. 2171-2174 ◽  
Author(s):  
Chanchai Thongpin ◽  
C. Sangnil ◽  
P. Suerkong ◽  
A. Pongpilaiprertti ◽  
Narongrit Sombatsompop
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Crosslinking Density ◽  
High Concentration ◽  
Precipitated Silica ◽  
Vulcanized Rubber ◽  
Rubber Compounds ◽  
Cure Time ◽  
Cure Characteristic ◽  
Characterization Test

This research is concentrated on the effect of concentration of silane-69 used for surface modification on precipitated silica (PSi), on cure characteristic and mechanical properties of PSi filled NR. The PSi content in this study was fixed at 20 phr in order to reveal the effect of silane used to modify PSi, on NR compound and vulcanizate. Moving Die Rheometer (MDR) was used to characterize cure characteristic of rubber compounds. Generally, scorch and cure time of NR would increase with the addition of PSi due to the absorption of accelerator on its surface whereas the addition of Si-69 modified PSi would reduce both scorch and cure time. It was found in this research that the excess amount of Si-69 used increased scorch and cure time of rubber compounds. This was thought to be that the excess of Si-69 led to the formation of polysiloxane clusters which could absorb accelerator in rubber compound and resulted in a prolonged scorch and cure time. In term of vulcanized rubber, it was found that maximum torque increased with the concentration of Si-69 up to 6 %. The polysiloxane formed during the cure characterization test was responsible for the slightly decreased torque after 6% of Si-69 treatment. Nonetheless, even with high concentration of Si-69 used, torque was still higher than that of untreated PSi filled NR. This is widely understood that sulfur atoms in Si-69 molecule are able to participate in the bonding between rubber and silane molecules resulted in the enhancement of crosslink density of the vulcanizate rubber. The increased of modulus at 200 % elongation, tensile strength under tension, with the silane concentration, was evidence of the crosslink enhancement. Tear strength and hardness of the vulcanizates exhibiting the increment, with the silane used, also clearly confirmed the bonding between Si-69 and rubber molecules. It was elucidated from the research that excess of Si-69 would lead to polysiloxane formation, cluster form of silane and crosslinking density. Scanning Electron Microscope (SEM) micrographs and swelling test are also presented to confirm the phenomena.

Microstructure and Friction Behavior of AISI 52100 and D2 Steels Subjected to Ultrasonic Nanocrystalline Surface Modification (UNSM) Technique at a High Temperature

2016 ◽  
Vol 879 ◽  
pp. 164-168
Author(s):  
Auezhan Amanov ◽  
Jun Hyong Kim ◽  
Young Sik Pyun
Keyword(s):  
Surface Modification ◽  
High Temperature ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Friction Behavior ◽  
Friction And Wear Behavior ◽  
Aisi 52100 ◽  
Before And After ◽  
Dry Conditions

In this study, two different AISI 52100 bearing and D2 tool steels were subjected to ultrasonic nanocrystalline surface modification (UNSM) technique at ambient and high temperature of 500 °C. The objective of this study is to characterize the microstructure and to investigate the effectiveness of UNSM technique on the friction and wear behavior of those steels. The friction and wear behavior of the specimens against AISI52100 bearing steel ball with a diameter of 10 mm was carried out using a micro-tribo tester under dry conditions. The hardness with respect to depth from the top surface was measured using a microhardness. The change in the microstructure of the specimens before and after UNSM treatment was characterized by scanning electron microscopy (SEM). The findings from this preliminary study are expected to be implemented to the bearings and tools to increase the efficiency and performance of the components.

Surface Modification of Polypropylene with Primary Amines by Acrylamide Radiation Grafting and Hofmann's Transposition Reaction

2019 ◽  
Vol 4 (26) ◽  
pp. 7759-7765 ◽  
Author(s):  
Efraín Rodríguez‐Alba ◽  
Lázaro Huerta ◽  
Alejandra Ortega ◽  
Guillermina Burillo
Keyword(s):  
Surface Modification ◽  
Primary Amines ◽  
Radiation Grafting ◽  
Transposition Reaction

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation-exchange resin

2018 ◽  
Vol 136 (10) ◽  
pp. 47145 ◽  
Author(s):  
Muhammad Inaam ul Hassan ◽  
Shaista Taimur ◽  
Ijaz Ahmed Khan ◽  
Tariq Yasin ◽  
Syed Wasim Ali
Keyword(s):  
Surface Modification ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Radiation Grafting
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