In situ reactive compatibilization of polypropylene/trans-1,4-poly(isoprene-co-butadiene) rubber (TBIR) blends with balanced toughness and stiffness via dynamic vulcanization

2019 ◽  
Vol 142 ◽  
pp. 60-68 ◽  
Author(s):  
Zhaobo Sun ◽  
Yuefa Zhang ◽  
Huafeng Shao ◽  
Aihua He
Keyword(s):  
Butadiene Rubber ◽  
Dynamic Vulcanization ◽  
Reactive Compatibilization

Effect of Bis (Diisopropyl) Thiophosphoryl Disulfide on the Co-Vulcanization of Carboxylic-Acrylonitrile-Butadiene Rubber and Ethylene-Propylene-Diene Rubber Blends

2002 ◽  
Vol 75 (2) ◽  
pp. 309-322 ◽  
Author(s):  
Nityananda Naskar ◽  
Subhas Chandra Debnath ◽  
Dipak Kumar Basu
Keyword(s):  
Physical Properties ◽  
Reaction Scheme ◽  
Butadiene Rubber ◽  
Two Stage ◽  
Reactive Compatibilization ◽  
Sem Micrographs ◽  
Rubber Blends ◽  
Acrylonitrile Butadiene Rubber ◽  
Vulcanization Process

Abstract The objective of the work is to prepare compatible, coherent and technologically feasible blends comprising non-polar EPDM rubber and polar carboxylic-acrylonitrile-butadiene rubber (XNBR). Using an efficient sulfur vulcanization system containing bis(diisopropyl) thiophosphoryl disulfide (DIPDIS), a coupling agent cum accelerator, EPDM-XNBR blend has been co-vulcanized. The blend vulcanizates thus produced exhibit substantially enhanced physical properties which are superior to those of either component. The compatibility of the rubber blends as judged by SEM micrographs can further be improved through a two-stage vulcanization process which promotes interphase crosslinking between the polymer phases. The interphase crosslinking was recognized from swelling experiments. The study of the blends containing carbon black reveals a profound increase in physical properties of the vulcanizates as compared to those of gum vulcanizates. The SEM micrographs of the blend vulcanizates both in one-stage and two-stage distinctly indicate the blend morphology, which accounts for the significant improvement in physical properties of EPDM-XNBR blends through in situ reactive compatibilization. A reaction scheme for the interphase crosslinking has been proposed for the co-curing of EPDM-XNBR blend.

scholarly journals Blending In Situ Polyurethane-Urea with Different Kinds of Rubber: Performance and Compatibility Aspects

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2175 ◽  
Author(s):  
Muhammad Tahir ◽  
Gert Heinrich ◽  
Nasir Mahmood ◽  
Regine Boldt ◽  
Sven Wießner ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Response ◽  
Stress Transfer ◽  
Nitrile Rubber ◽  
Styrene Butadiene Rubber ◽  
High Tech ◽  
Butadiene Rubber ◽  
Reactive Compatibilization ◽  
Blending Method

Specific physical and reactive compatibilization strategies are applied to enhance the interfacial adhesion and mechanical properties of heterogeneous polymer blends. Another pertinent challenge is the need of energy-intensive blending methods to blend high-tech polymers such as the blending of a pre-made hard polyurethane (-urea) with rubbers. We developed and investigated a reactive blending method to prepare the outstanding blends based on polyurethane-urea and rubbers at a low blending temperature and without any interfacial compatibilizing agent. In this study, the polyurethane-urea (PUU) was synthesized via the methylene diphenyl diisocyanate end-capped prepolymer and m-phenylene diamine based precursor route during blending at 100 °C with polar (carboxylated nitrile rubber (XNBR) and chloroprene rubber (CR)) and non-polar (natural rubber (NR), styrene butadiene rubber (sSBR), and ethylene propylene butadiene rubber (EPDM)) rubbers. We found that the in situ PUU reinforces the tensile response at low strain region and the dynamic-mechanical response up to 150 °C in the case of all used rubbers. Scanning electron microscopy reveals a stronger rubber/PUU interface, which promotes an effective stress transfer between the blend phases. Furthermore, energy filtered transmission electron microscopy (EFTEM) based elemental carbon map identifies an interphase region along the interface between the nitrile rubber and in situ PUU phases of this exemplary blend type.

Reactive compatibilization of recycled low density polyethylene/butadiene rubber blends during dynamic vulcanization

2003 ◽  
Vol 202 (1) ◽  
pp. 117-126 ◽  
Author(s):  
Alexander Fainleib ◽  
Olga Grigoryeva ◽  
Olga Starostenko ◽  
Inna Danilenko ◽  
Lubov Bardash
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Butadiene Rubber ◽  
Dynamic Vulcanization ◽  
Reactive Compatibilization ◽  
Rubber Blends ◽  
Recycled Low Density Polyethylene

scholarly journals Thermoplastic Dynamic Vulcanizates with In Situ Synthesized Segmented Polyurethane Matrix

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1663 ◽  
Author(s):  
Andrea Kohári ◽  
István Zoltán Halász ◽  
Tamás Bárány
Keyword(s):  
Mechanical Properties ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Dynamic Vulcanization ◽  
Sem Images ◽  
Acrylonitrile Butadiene Rubber ◽  
Atomic Force ◽  
Rubber Particles ◽  
Rubber Phase

The aim of this paper was the detailed investigation of the properties of one-shot bulk polymerized thermoplastic polyurethanes (TPUs) produced with different processing temperatures and the properties of thermoplastic dynamic vulcanizates (TDVs) made by utilizing such in situ synthetized TPUs as their matrix polymer. We combined TPUs and conventional crosslinked rubbers in order to create TDVs by dynamic vulcanization in an internal mixer. The rubber phase was based on three different rubber types: acrylonitrile butadiene rubber (NBR), carboxylated acrylonitrile butadiene rubber (XNBR), and epoxidized natural rubber (ENR). Our goal was to investigate the effect of different processing conditions and material combinations on the properties of the resulting TDVs with the opportunity of improving the interfacial connection between the two phases by chemically bonding the crosslinked rubber phase to the TPU matrix. Therefore, the matrix TPU was synthesized in situ during compounding from diisocyanate, diol, and polyol in parallel with the dynamic vulcanization of the rubber mixture. The mechanical properties were examined by tensile and dynamical mechanical analysis (DMTA) tests. The morphology of the resulting TDVs was studied by atomic force microscopy (AFM) and scanning electron microscopy (SEM) and the thermal properties by differential scanning calorimetry (DSC). Based on these results, the initial temperature of 125 °C is the most suitable for the production of TDVs. Based on the atomic force micrographs, it can be assumed that phase separation occurred in the TPU matrix and we managed to evenly distribute the rubber phase in the TDVs. However, based on the SEM images, these dispersed rubber particles tended to agglomerate and form a quasi-continuous secondary phase where rubber particles were held together by secondary forces (dipole–dipole and hydrogen bonding) and can be broken up reversibly by heat and/or shear. In terms of mechanical properties, the TDVs we produced are on a par with commercially available TDVs with similar hardness.

In-situ Modification of Graphene Oxide by Insoluble Sulfur and Application for Nitrile Butadiene Rubber

2020 ◽  
Vol 35 (2) ◽  
pp. 221-228
Author(s):  
S.-B. Chen ◽  
T.-X. Li ◽  
S.-H. Wan ◽  
X. Huang ◽  
S.-W. Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
In Situ Modification
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