Revealing effects of chain scission during ageing of EPDM rubber using relaxation and recovery experiment

2016 ◽  
Vol 56 ◽  
pp. 261-268 ◽  
Author(s):  
Anja Kömmling ◽  
Matthias Jaunich ◽  
Dietmar Wolff
Keyword(s):  
Chain Scission ◽  
Epdm Rubber ◽  
Recovery Experiment

Changes in molecular weight distribution caused by main-chain scission of electron beam resists

2020 ◽  
Vol 59 (12) ◽  
pp. 126506
Author(s):  
Takahiro Kozawa ◽  
Ayako Nakajima ◽  
Manabu Hoshino
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Main Chain ◽  
Chain Scission

Ultrasonic properties of ENR-EPDM rubber blends

2003 ◽  
Vol 50 (1-2) ◽  
pp. 115-122 ◽  
Author(s):  
Hesham A. Afifi ◽  
Ahmed M. El Sayed
Keyword(s):  
Ultrasonic Properties ◽  
Epdm Rubber ◽  
Rubber Blends

scholarly journals Best Practice for De-Vulcanization of Waste Passenger Car Tire Rubber Granulate Using 2-2′-dibenzamidodiphenyldisulfide as De-Vulcanization Agent in a Twin-Screw Extruder

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1139
Author(s):  
Hans van Hoek ◽  
Jacques Noordermeer ◽  
Geert Heideman ◽  
Anke Blume ◽  
Wilma Dierkes
Keyword(s):  
Best Practice ◽  
Chain Scission ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Passenger Car ◽  
Tire Rubber ◽  
Twin Screw ◽  
Styrene Butadiene

De-vulcanization of rubber has been shown to be a viable process to reuse this valuable material. The purpose of the de-vulcanization is to release the crosslinked nature of the highly elastic tire rubber granulate. For present day passenger car tires containing the synthetic rubbers Styrene-Butadiene Rubber (SBR) and Butadiene Rubber (BR) and a high amount of silica as reinforcing filler, producing high quality devulcanizate is a major challenge. In previous research a thermo-chemical mechanical approach was developed, using a twin-screw extruder and diphenyldisulfide (DPDS) as de-vulcanization agent.The screw configuration was designed for low shear in order to protect the polymers from chain scission, or uncontrolled spontaneuous recombination which is the largest problem involved in de-vulcanization of passenger car tire rubber. Because of disadvantages of DPDS for commercial use, 2-2′-dibenzamidodiphenyldisulfide (DBD) was used in the present study. Due to its high melting point of 140 °C the twin-screw extruder process needed to be redesigned. Subsequent milling of the devulcanizate at 60 °C with a narrow gap-width between the mill rolls greatly improved the quality of the devulcanizate in terms of coherence and tensile properties after renewed vulcanization. As the composition of passenger car tire granulate is very complex, the usefulness of the Horikx-Verbruggen analysis as optimization parameter for the de-vulcanization process was limited. Instead, stress-strain properties of re-vulcanized de-vulcanizates were used. The capacity of the twin-screw extruder was limited by the required residence time, implying a low screw speed. A best tensile strength of 8 MPa at a strain at break of 160% of the unblended renewed vulcanizate was found under optimal conditions.

scholarly journals Phase transition in Ga2O3 studied by shock-recovery experiment

2020 ◽  
Author(s):  
Hiroaki Kishimura ◽  
Hitoshi Matsumoto
Keyword(s):  
Phase Transition ◽  
Recovery Experiment

Assessment of blue crab Shell ( Callinectes sapidus ) particles as bio‐based filler to EPDM rubber

2021 ◽  
pp. 51540
Author(s):  
İsmail Kutlugün Akbay ◽  
Ahmet Güngör ◽  
Tonguç Özdemir
Keyword(s):  
Blue Crab ◽  
Callinectes Sapidus ◽  
Crab Shell ◽  
Epdm Rubber

scholarly journals Theoretical and experimental characterization for macro-micro friction behaviors of EPDM rubber

2021 ◽  
Vol 99 ◽  
pp. 107213
Author(s):  
Chuanbing Zhang ◽  
Jian Wu ◽  
Fei Teng ◽  
Benlong Su ◽  
Youshan Wang ◽  
...  
Keyword(s):  
Experimental Characterization ◽  
Epdm Rubber

Kinetic study of random chain scission by viscometry

1990 ◽  
Vol 41 (56) ◽  
pp. 985-994 ◽  
Author(s):  
K. K. Chee
Keyword(s):  
Kinetic Study ◽  
Chain Scission

Study in performance and morphology of polyamide 12 produced by selective laser sintering technology

2018 ◽  
Vol 24 (5) ◽  
pp. 813-820 ◽  
Author(s):  
Junjie Wu ◽  
Xiang Xu ◽  
Zhihao Zhao ◽  
Minjie Wang ◽  
Jie Zhang
Keyword(s):  
Selective Laser Sintering ◽  
Polarized Light ◽  
Chain Scission ◽  
High Energy ◽  
Laser Sintering ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Content Type ◽  
X Ray ◽  
Polyamide 12

Purpose The purpose of this paper is to investigate the effect of selective laser sintering (SLS) method on morphology and performance of polyamide 12. Design/methodology/approach Crystallization behavior is critical to the properties of semi-crystalline polymers. The crystallization condition of SLS process is much different from others. The morphology of polyamide 12 produced by SLS technology was investigated using scanning electron microscopy, polarized light microscopy, differential scanning calorimetry, X-ray diffraction and wide-angle X-ray diffraction. Findings Too low fill laser power brought about bad fusion of powders, while too high energy input resulted in bad performance due to chain scission of macromolecules. There were three types of crystal in the raw powder material, denoted as overgrowth crystal, ring-banded spherulite and normal spherulite. Originality/value In this work, SLS samples with different sintering parameters, as well as compression molding sample for the purpose of comparison, were made to study the morphology and crystal structure of sintered PA12 in detail.

Sign in / Sign up

Export Citation Format

Share Document