Dynamically vulcanized ethylene-methacrylic acid copolymer/nitrile butadiene rubber blends reinforced by zinc dimethacrylate

2019 ◽  
pp. 089270571986648
Author(s):  
Kerui Liao ◽  
Feifei Liu ◽  
Zhaobo Wang
Keyword(s):  
Mechanical Properties ◽  
Methacrylic Acid ◽  
Residual Deformation ◽  
Mullins Effect ◽  
Butadiene Rubber ◽  
Dynamic Vulcanization ◽  
Rubber Blends ◽  
Nitrile Butadiene Rubber ◽  
Acid Copolymer ◽  
Etched Surface

Thermoplastic vulcanizates (TPVs) based on ethylene-methacrylic acid (EMA) copolymer/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization where the NBR phase was reinforced by zinc dimethacrylate (ZDMA). The effect of ZDMA dosage on the mechanical properties, Mullins effect, and morphology of the TPVs was investigated systematically. Experimental results indicated that the mechanical properties of EMA/NBR TPVs were enhanced remarkably with the incorporation of ZDMA. Morphology study showed that the NBR particles with diameters of about 1–5 μm were dispersed evenly in the etched surface of EMA/NBR/ZDMA TPV. The Mullins effect could be observed in the stress–strain curves of EMA/NBR TPV and EMA/NBR/ZDMA TPV during the uniaxial loading–unloading cycles. Compared with those of EMA/NBR TPV, EMA/NBR/ZDMA TPV had the higher stress, residual deformation, and internal friction loss.

Dynamically vulcanized high-density polyethylene/nitrile butadiene rubber blends compatibilized by chlorinated polyethylene

2018 ◽  
Vol 32 (4) ◽  
pp. 454-472
Author(s):  
Lin Zhang ◽  
Libin Wang ◽  
Yujiao Shi ◽  
Zhaobo Wang
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Residual Deformation ◽  
High Density ◽  
Mullins Effect ◽  
Butadiene Rubber ◽  
Dynamic Vulcanization ◽  
Chlorinated Polyethylene ◽  
Dynamic Mechanical ◽  
Nitrile Butadiene Rubber

Thermoplastic vulcanizates (TPVs) based on high-density polyethylene (HDPE)/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization where chlorinated polyethylene (CPE) was used as a compatibilizer. The effects of CPE on mechanical properties, Mullins effect, dynamic mechanical properties, and morphology of the blends were investigated systematically. Experimental results indicated that CPE had an excellent compatibilization on the HDPE/NBR blends. Dynamic mechanical analysis studies showed that the glass transition temperature of NBR phase was slightly shifted toward higher temperature with the CPE incorporation, leading to the increasing interface compatibility. Mullins effect results showed that the compatibilized HDPE/NBR blend had relatively lower residual deformation and internal friction than that of HDPE/NBR blend, indicating the improvement of elasticity. Morphology studies showed that the size of the NBR particles was decreased with the existence of CPE; moreover, the fracture surface of HDPE/CPE/NBR TPV was relatively smoother than that of HDPE/NBR blend.

HEAT-TRIGGERED SHAPE MEMORY EFFECT OF PEROXIDE CROSS-LINKED ETHYLENE–METHACRYLIC ACID COPOLYMER/NITRILE–BUTADIENE RUBBER THERMOPLASTIC VULCANIZATES WITH SEA-ISLAND STRUCTURE

2021 ◽  
Author(s):  
Yingtao Sun ◽  
Jiahao Li ◽  
Kerui Liao ◽  
Jing Hua ◽  
Zhaobo Wang
Keyword(s):  
Shape Memory ◽  
Methacrylic Acid ◽  
Shape Recovery ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
Nitrile Butadiene Rubber ◽  
Acid Copolymer ◽  
Thermoplastic Vulcanizates ◽  
Switching Temperature ◽  
Shape Fixity

ABSTRACT Designing shape memory polymers (SMPs) based on thermoplastic vulcanizates (TPVs) is an essential research topic. An efficient SMP is designed with typical sea-island structured ethylene–methacrylic acid copolymer/nitrile–butadiene rubber (EMA/NBR) TPVs in which the heat-control switched phase performed by the EMA phase is related to the shape fixity ability. The results show that the heat-triggered SMPs exhibit surprising shape memory properties (shape fixity >95%, shape recovery >95%, and fast recovery speed <30 s at the switching temperature of 95 °C). Through X-ray diffraction characterization, it is seen that the shape fixity of TPVs is achieved mainly through ethylene crystallization. The switching temperature is largely determined by the melting temperature (98 °C) obtained by differential scanning calorimetery.

Research on Mechanical Properties, Compatibility, Flame Retardancy, Hot-Air Ageing Resistance of Hydrogenated Nitrile-Butadiene Rubber/Chloroprene Rubber Blends

2013 ◽  
Vol 750-752 ◽  
pp. 816-819 ◽  
Author(s):  
Teng Teng Wang ◽  
Guo Lun Zhong ◽  
Li Ling Zhou
Keyword(s):  
Mechanical Properties ◽  
Flame Retardancy ◽  
Oxygen Index ◽  
Mechanical Analysis ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Nitrile Butadiene Rubber ◽  
Hot Air ◽  
Chloroprene Rubber ◽  
Limited Oxygen

The mechanical properties, compatibility, flame retardancy property, hot-air ageing resistance of hydrogenated nitrile-butadiene rubber (HNBR) / chloroprene rubber (CR) blends were investigated. With increasing CR, stress at 100% elongation, shore A hardness, limited oxygen index of HNBR/CR blends increased, while the tensile strength, hot-air aging resistance of the blends decreased. Differential scanning calorimeter (DSC) revealed that it’s incompatible with both HNBR and CR before vulcanization, however they became compatible completely after vulcanization as indicated by Dynamic Mechanical Analysis (DMA).

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