Novel fluorosilicone thermoplastic vulcanizates prepared via core-shell dynamic vulcanization: Effect of fluororubber/silicone rubber ratio on morphology, crystallization behavior, and mechanical properties

2018 ◽  
Vol 29 (5) ◽  
pp. 1456-1468 ◽  
Author(s):  
Yukun Chen ◽  
Zhou Gong ◽  
Liming Cao ◽  
Youhong Wang ◽  
Daosheng Yuan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicone Rubber ◽  
Crystallization Behavior ◽  
Core Shell ◽  
Dynamic Vulcanization ◽  
Thermoplastic Vulcanizates

Preparation of polyoxymethylene/methyl vinyl silicone rubber/thermoplastic polyurethane ternary thermoplastics vulcanizates with good toughness properties

2021 ◽  
pp. 089270572110571
Author(s):  
Wei Fang ◽  
Xiaodong Fan ◽  
Ruilong Li
Keyword(s):  
Silicone Rubber ◽  
Thermoplastic Polyurethane ◽  
Mechanical Tests ◽  
Curing Agent ◽  
Dynamic Vulcanization ◽  
Elongation At Break ◽  
Methyl Vinyl ◽  
Thermoplastic Vulcanizates ◽  
Vulcanization Process ◽  
Batch Mixer

Novel thermoplastic vulcanizates (TPVs) based on polyoxymethylene (POM) and methyl vinyl silicone rubber (MVQ) have been prepared by dynamic vulcanization process through a batch mixer. During the preparation of TPV blends, Di-(tert butyl peroxyisopropyl) benzene (BIBP) was used as the curing agent in order to make MVQ cross-linked and TPU was used to coat MVQ for improving the compatibility of MVQ and POM. In order to understand the influence of different compositions on TPV blends, five groups of experimental processes were described in detail. During these experiments, the amount of POM was reduced from 70phr to 30phr, that of MVQ was gradually increased from 18phr to 42 phr, and TPU was increased from 12phr to 28phr. In addition, the morphology and properties of TPVs were studied by DSC, FTIR, SEM, DMA and mechanical tests. The mechanical testing results showed that with the amount of POM decreasing and the total amount of MVQ and TPU increasing, the tensile strength of the TPV blends gradually was decreased, and the elongation at break was increased accordingly from 35.2 ± 6% of pure POM to 142.8 ± 11% of sample 5#.

scholarly journals Preparation of CaCO3-SiO2 composite with core-shell structure and its application in silicone rubber

2015 ◽  
Vol 17 (4) ◽  
pp. 128-133 ◽  
Author(s):  
Chenglin Cui ◽  
Hao Ding ◽  
Li Cao ◽  
Daimei Chen
Keyword(s):  
Mechanical Properties ◽  
Silicone Rubber ◽  
Shell Structure ◽  
Breaking Strength ◽  
Core Shell ◽  
Elongation At Break ◽  
Chemistry Method ◽  
Core Shell Structure

Abstract A new CaCO3-SiO2 composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO2 particles were homogeneously immobilized on the surface of CaCO3. The well dispersion of this CaCO3-SiO2 composite into silicone rubber can not only reduce the usage amount of SiO2, but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO2 particles is about 10 times as large as that of CaCO3 particles in the CaCO3-SiO2 composite. Mixing CaCO3-SiO2 composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO2. And the elongation at break is about 14% less than that of adding the pure SiO2 sample.

scholarly journals Effect of Mixing Method on Properties of Ethylene Vinyl Acetate Copolymer/Natural Rubber Thermoplastic Vulcanizates

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1739 ◽  
Author(s):  
Nappaphan Kunanusont ◽  
Chavakorn Samthong ◽  
Fan Bowen ◽  
Masayuki Yamaguchi ◽  
Anongnat Somwangthanaroj
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Rheological Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Dynamic Vulcanization ◽  
Thermoplastic Vulcanizates ◽  
Mixing Method ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Thermoplastic vulcanizate (TPV) has excellent elastomeric properties and can be reprocessed multiple times. TPV is typically produced by using the dynamic vulcanization (DV) method in which rubber is crosslinked simultaneously with thermoplastics. Peroxide-crosslinked TPV can increase the compatibility between rubber and thermoplastics but loses its reprocessability due to excess crosslinking in the latter. In this work, we overcome this obstacle by using a two-step mixing method to prepare fully crosslinked elastomers of ethylene vinyl acetate copolymer (EVA) and natural rubber (NR). Each sample formulation was prepared with three different mixing methods for comparison: NR-DV, Split-DV, and All-DV. For NR-DV, NR was crosslinked prior to the addition of EVA together with the thermal stabilizer (TS). For Split-DV, a small amount of EVA and NR was crosslinked prior to the addition of EVA and TS. In the All-DV method, EVA and NR were crosslinked, and then TS was added. The appearance and processability of the samples were affected by the degree of crosslinking. NR-DV showed a non-homogeneous texture. Although the samples of the All-DV method appeared homogeneous, their mechanical and rheological properties were inferior to those of the Split-DV method. The mechanical properties of the Split-DV samples were not significantly changed after reprocessing 10 times. Therefore, Split-DV is the preferred method for TPV production.

scholarly journals Enhance Thermoelectric and Mechanical Properties of Thermoplastic Vulcanizates (TPVs) by Constructing Nanosheet Network of Hydroxylated Graphene

2021 ◽  
Author(s):  
Qi Tang ◽  
Lan Cao ◽  
Xiurui Lang ◽  
Yingxia Zong ◽  
Chengzhong Zong
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Maleic Anhydride ◽  
Interfacial Interaction ◽  
Interface Bonding ◽  
Dynamic Vulcanization ◽  
Strong Interfacial Interaction ◽  
Rubber Particles ◽  
Thermoplastic Vulcanizates ◽  
Vulcanization Process

In order to obtain higher thermoelectric and mechanical properties in non-polar thermoplastic vulcanizates (TPVs), the Butyl rubber/Polypropylene (TPVs)/hydroxylated graphene (HGE) composites with nanosheet network were prepared through masterbatch technique and based on thermodynamic calculations, using polypropylene-graft-maleic anhydride (PP-MA) as a compatibilizer. The FTIR and Raman spectra revealed the introduced maleic anhydride group on PP-MA can form strong interfacial interaction with hydroxyl-containing functional groups on HGE. Morphology study indicated the rubber particles in the composites occupied the most volume of the PP phase, as expected to hinder the aggregation of HGE and form the effective nanosheet network. The nanosheet network can be combined with the IIR cross-linked particles during the dynamic vulcanization process to improve the interface bonding between PP and IIR, thus increasing the tensile strength of TPVs. When the content of HGE reached the percolation threshold (2 wt.%), the nanosheet network of HGE was formed, and the AC conductivity, dielectric permittivity and thermal conductivity increased sharply. The prepared TPVs/HGE nanocomposites have significantly improved in mechanical properties, thermal properties and dielectric properties, which provides a guarantee for their potential application as multifunctional TPVs polymers.

scholarly journals Effect of Core-Shell Morphology on the Mechanical Properties and Crystallization Behavior of HDPE/HDPE-g-MA/PA6 Ternary Blends

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1040 ◽  
Author(s):  
Lien Zhu ◽  
Haoming Wang ◽  
Meihua Liu ◽  
Zheng Jin ◽  
Kai Zhao
Keyword(s):  
Mechanical Properties ◽  
Shell Structure ◽  
High Density Polyethylene ◽  
Crystallization Behavior ◽  
High Density ◽  
Core Shell ◽  
Ternary Blends ◽  
The Core ◽  
Core Shell Structure ◽  
Shell Particles

In this paper, the high-density polyethylene/maleic anhydride grafted high-density polyethylene/polyamide 6 (HDPE/HDPE-g-MA/PA6) ternary blends were prepared by blend melting. The binary dispersed phase (HDPE-g-MA/PA6) is of a core-shell structure, which is confirmed by the SEM observation and theoretical calculation. The crystallization behavior and mechanical properties of PA6, HDPE-g-MA, HDPE, and their blends were investigated. The crystallization process, crystallization temperature, melting temperature, and crystallinity were studied by differential scanning calorimetry (DSC) testing. The results show that PA6 and HDPE-g-MA interact with each other during crystallizing, and their crystallization behaviors are different when the composition is different. At the same time, the addition of core-shell particles (HDPE-g-MA/PA6) can affect the crystallization behavior of the HDPE matrix. With the addition of the core-shell particles, the comprehensive mechanical properties of HDPE were enhanced, including tensile strength, elastic modulus, and the impact strength. Combined with previous studies, the toughening mechanism of core-shell structure is discussed in detail. The mechanism of the core-shell structure toughening is not only one, but the result of a variety of mechanisms together.

Mechanical properties, morphology, and Mullins effect of thermoplastic vulcanizates based on ethylene–vinyl acetate copolymer/ethylene–vinyl acetate rubber

2015 ◽  
Vol 30 (6) ◽  
pp. 827-839 ◽  
Author(s):  
Cancan Wang ◽  
Yufeng Zhang ◽  
Zhaobo Wang
Keyword(s):  
Mechanical Properties ◽  
Vinyl Acetate ◽  
Weight Ratio ◽  
Residual Deformation ◽  
Ethylene Vinyl Acetate ◽  
Mullins Effect ◽  
Dynamic Vulcanization ◽  
Thermoplastic Vulcanizates ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Thermoplastic vulcanizates (TPVs) based on ethylene–vinyl acetate copolymer (EVA)/ethylene–vinyl acetate rubber (EVM) were prepared by dynamic vulcanization. Mechanical properties, morphology, and Mullins effect of the TPVs were investigated. The results showed that the EVA/EVM TPV with 40/60 weight ratio had excellent mechanical properties. There was no obvious phase separation on the fracture surface of the TPV. Mullins effect could be observed in the stress–strain curves of TPVs during the uniaxial loading–unloading cycles. Compared with TPV with 20/80 weight ratio, the TPV with 40/60 weight ratio had the relatively larger maximum stress, residual deformation, and internal friction loss at specific strain.

Oil and Petrol Resistant Thermoplastic Vulcanizations Based on ABS-Plastic Mixture with Copolymer Butadiene and Acrylonitrile

2019 ◽  
Vol 816 ◽  
pp. 192-196
Author(s):  
Alsou D. Nasertdinova ◽  
A.D. Dementev ◽  
A.D. Khusainov ◽  
Svetoslav Isaakovich Volfson
Keyword(s):  
Mechanical Properties ◽  
Phenol Formaldehyde ◽  
Strength Properties ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Butadiene Rubber ◽  
Dynamic Vulcanization ◽  
Alkyl Phenol ◽  
Rubber Compounds ◽  
Thermoplastic Vulcanizates

The effect of the type and dosage of sulfur and resin (alkyl phenol formaldehyde resin grade SP - 1045) vulcanizing systems on the oil and petrol resistance and elastic strength properties of thermoplastic vulcanizates (TPV) obtained on the basis of nitrile-butadiene rubber and ABS-plastic, with a ratio of 70/30 respectively has been studied. In the course of studies of vulcanization characteristics, it was found that with an increase in the content of the vulcanizing system, the rate of vulcanization increases both during the vulcanization of rubber compounds and during dynamic vulcanization. The physic-mechanical properties of the TPV obtained indicate that with a fascination for the content of the vulcanizing system, the elastic-strength properties and the oil and petrol resistance of the TPV are also increased.

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