Surface modification of vulcanized rubber by radiation grafting, part 2: Improvement in performance of wiper rubber

2011 ◽  
Vol 123 (4) ◽  
pp. 2172-2176 ◽  
Author(s):  
N. Mizote ◽  
A. Katakai ◽  
M. Tamada
Keyword(s):  
Surface Modification ◽  
Radiation Grafting ◽  
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.

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

The Method and Evaluation of Biological Materials to Functional Reconstruction of Ligament Defects in Exercise-Induced Ligament Injury

2014 ◽  
Vol 1014 ◽  
pp. 57-60
Author(s):  
Bao Peng ◽  
Qian Xiao ◽  
Xue Dang
Keyword(s):  
Surface Modification ◽  
Materials Science ◽  
Surface Topology ◽  
Ligament Injury ◽  
Good Prospect ◽  
Radiation Grafting ◽  
Functional Reconstruction ◽  
Cell Affinity ◽  
Good Biocompatibility ◽  
Exercise Induced

At present, in order to make the biological material in the treatment of ligament, tendon defect with good biocompatibility and cell affinity, to the surface modification of biomaterials, commonly known as surface modification. The surface modification methods contain fixed proteins, fixed peptide and radiation grafting and ion implantation. Research shows that, through surface modification of biomaterials, not only enhance the cell adhesion, but also promoted cell proliferation. The surface modification of biomaterials is a complicated system engineering, need to take into consideration the needs in materials science and biological science, and optimize. Ideal surface modification should take into account the surface topology, specific recognition, hydrophilic hydrophobic balance, protein adsorption, all aspects of functional new tissues can be obtained. This provides a good prospect of application for the repair of exercise ligament injury.

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