Effects of molecule aggregation state on dynamic mechanical properties of chlorinated polyethylene/hindered phenol blends

J of Applied Polymer Sci

Cao

Zou

et al. 2011

ABSTRACT:Crosslinked nitrile-butadiene rubber (NBR)/hindered phenol composites were successfully prepared by mixing tetrakis [methylene-3-(3-5-ditert-butyl-4-hydroxy phenyl) propionyloxy] methane (AO-60) into NBR with 35% acrylonitrile mass fraction. The structural and mechanical properties of the NBR/AO-60 composites were systematically investigated by using differential scanning calorimeter, XRD, Fourier transform infrared, scanning electronic microscope, dynamic mechanical analyzer, and tensile testing. The results indicated that the AO-60 changed from crystalline form into amorphous form, and most of the AO-60 molecules could be uniformly dispersed in the NBR matrix. The glass transition temperature (T g ) of NBR/AO-60 composites increased gradually with increasing content of AO-60. The increase in T g could be attributed to the formation of a strong hydrogen bonding network between the AO-60 molecules and the NBR matrix. Unlike the pure NBR, the NBR/AO-60 rubber composites had only one transition with a high loss factor. With increasing content of AO-60, the loss peak shifted to the high temperature region, the loss factor increased from 1.45 to 1.91, and the area under the tan d versus temperature curve (TA) also showed a significant increase. All these results were ascribed to the good compatibility and strong intermolecular interactions between NBR and AO-60. Furthermore, all NBR/AO-60 composites exhibited higher glass transition temperatures and tensile strength than NBR, and they had other desirable mechanical properties. They have excellent prospects in damping material applications.

Section: Introductionmentioning

confidence: 99%

Structure and dynamic properties of nitrile‐butadiene rubber/hindered phenol composites

J of Applied Polymer Sci

Cao

Zou

et al. 2011

“…In previous studies, 10,13 researchers found intercomponent hydrogen bonding is a key factor responsible for achieving a good damping property. It was concluded that the destruction and reconstruction of hydrogen bonding caused high energy dissipation under dynamic deformation and thus improved the damping property.…”

Section: Damping Mechanismmentioning

confidence: 99%

“…The earlier researchers found that the bifunctional molecules, such as AO-60, AO-70, AO-80, AO-2246, can greatly improve the damping property of different polar polymers, such as chlorinated polyethylene, chlorinated polypropylene, acrylate rubber, 7-12 hydrogenated nitrile butadiene rubber, 13,14 carboxylated nitrile rubber, 15 poly(vinyl chloride) and polyurethane. 16 The improvement of damping property is mainly caused by the following factors: (1) the destruction and re-construction of reversible hydrogen bonding interactions between matrix polymers and hindered phenol results in a large consumption of energy during dynamic deformations; 10,13 (2) the strong interactions between bifunctional small molecules and matrix enhances intermolecular friction and results in a large consumption of energy during dynamic deformations; 17,18 (3) the excellent viscoelastic property of hindered phenol (the loss tangent of AO-80 426) 14,19 also contributes to improvement of the damping property of the hybrids.…”

Section: Introductionmentioning

confidence: 99%

Studies on the damping properties of polyacrylate emulsion/hindered phenol hybrids

Zhou

Zhang

et al. 2012

Polym J

Organic hybrids of polyacrylate emulsion (PAE)/hindered phenol (3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid thiodi-2,1-ethanediyl ester, abbreviated as Irganox-1035) have been prepared in this study. The dynamic mechanical properties, denoted by storage modulus (E 0 ) and loss factor (tand), of this binary system have been investigated. Dynamic mechanical analysis (DMA) results show that by adding Irganox-1035, the tand peak maximum of the hybrids are remarkably increased up to 4.2, demonstrating PAE/Irganox-1035 hybrids are promising damping materials. The damping mechanism of the hybrids has also been systematically investigated through Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), X-ray diffraction (XRD), DMA and scanning electronic microscope (SEM). The experimental results indicate no hydrogen bonding is formed between polyacrylate matrix and Irganox-1035 molecules and PAE has a good compatibility with Irganox-1035 existing in the amorphous form in the hybrids. Meanwhile, DMA results show amorphous Irganox-1035 has a super-high viscoelastic property (tand ¼ 20.7), which improves the damping performance of this compatible hybrids system.

“…Because of their excellent damping performance, organic hybrid elastomer composites have become the focus of many studies in recent years [11][12][13]. In our previous studies [14][15][16], we prepared a kind of organic hybrid materials with excellent damping properties by adding hindered phenol to the rubber matrix.…”

Section: Introductionmentioning

confidence: 99%

Natural rubber/nitrile butadiene rubber/hindered phenol composites with high-damping properties

Yang

International Journal of Smart and Nano Materials

et al. 2015

New natural rubber (NR)/nitrile butadiene rubber (NBR)/hindered phenol (AO-80) composites with high-damping properties were prepared in this study. The morphological, structural, and mechanical properties were characterized by atomic force microscopy (AFM), polarized Fourier transform infrared spectrometer (FTIR), dynamic mechanical thermal analyzer (DMTA), and a tensile tester. Each composite consisted of two phases: the NR phase and the NBR/AO-80 phase. There was partial compatibility between the NR phase and the NBR/AO-80 phase, and the NR/NBR/AO-80 (50/50/20) composite exhibited a co-continuous morphology. Strain-induced crystallization occurred in the NR phase at strains higher than 200%, and strain-induced orientation appeared in the NBR/AO-80 phase with the increase of strain from 100% to 500%. The composites had a special stress-strain behavior and mechanical properties because of the simultaneous strain-induced orientation and strain-induced crystallization. In the working temperature range of a seismic isolation bearing, the composites (especially the NR/NBR/AO-80 (50/50/20) composite) presented a high loss factor, high area of loss peak (TA), and high hysteresis energy. Therefore, the NR/NBR/AO-80 rubber composites are expected to have important application as a high-performance damping material for rubber bearing.