Temperature dependence of reinforcement in the composites polyurethane rubber–crosslinked polymeric filler

Kolařı́k, Jan; Hudeček, S.; Lednický, F.; Nicolais, L.

doi:10.1002/app.1979.070230524

Cited by 16 publications

(5 citation statements)

References 37 publications

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“…2). As the observed changes in the moduli are relatively small, the analysis of the reinforcing effect of fillers with the aid of existing models 37,38) could hardly bring any valuable information.…”

Section: Resultsmentioning

confidence: 98%

Composites of alkaline poly(6-hexanelactam) with solid lubricants: one-step synthesis, structure, and mechanical properties

Horský¹,

Kolařı́k

Fambri

1999

Angew. Makromol. Chem.

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One‐step preparation of composites of alkaline poly(6‐hexanelactam) (PCL) with solid lubricants (SL), such as graphite and molybdenum disulfide, is an energy‐saving process as additional polymer fusion and melt mixing are not necessary. The initiator/activator system used were: (i) sodium dihydrido‐bis(2‐methoxyethoxo) aluminate (SYN)/cyclic trimer of phenyl isocyanate (PIC); (ii) sodium/hexamethylene‐1,6‐diisocyanate (HMDIC); (iii) SYN/HMDIC. These systems have been found suitable for the composite synthesis since they are relatively insensitive to traces of humidity and other low‐molar‐mass compounds which may be adsorbed on lubricant surfaces. Incorporated graphite (up to 20 wt.‐%) and MoS2 (up to 40 wt.‐%) do not perceptibly affect glass transition temperature, melting temperature and crystallization temperature while polymer yield, polymerization degree and rate decrease. The crystallinity assessed by DSC passes through a maximum at 20% of MoS2 in contrast to that detected by X‐ray diffraction (XR) measurements. As expected, the mean spherulite diameter drops profoundly. Both SL affect mechanical properties of produced composites: (i) increase the modulus; (ii) decrease the compliance, the time dependence of which remains close to that observed for the matrix; (iii) reduce the yield strength; (iv) slightly lower the impact strength of composites. A tentative hybrid composite containing 15 wt.‐% of graphite, 5 wt.‐% of MoS2, and 5 wt.‐% of mineral oil (as a liquid lubricant) shows a modulus high enough and its propensity to creep is not enhanced. The observed changes in mechanical properties of PCL caused by the incorporation of SL do not preclude applications analogous to those of unfilled PCL. Friction properties of the composites were beyond the scope of this work.

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Section: Resultsmentioning

confidence: 98%

Composites of alkaline poly(6-hexanelactam) with solid lubricants: one-step synthesis, structure, and mechanical properties

Horský¹,

Kolařı́k

Fambri

1999

Angew. Makromol. Chem.

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“…In these three‐phase compounds, two types of structures were observed. In one structure, the elastomer and filler particles were dispersed separately on the polymeric matrix, whereas the elastomeric phase encapsulated these particles in the second structure . In previous studies based on HDPE/EPDM/GTR systems, EPDM tended to encapsulate GTR .…”

Section: Resultsmentioning

confidence: 99%

Thermoplastic elastomers based on high‐density polyethylene, ethylene–propylene–diene terpolymer, and ground tire rubber dynamically vulcanized with dicumyl peroxide

Narro-Céspedes

Gámez

Velázquez

et al. 2013

J of Applied Polymer Sci

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Thermoplastic vulcanizates (TPVs) based on high‐density polyethylene (HDPE), ethylene–propylene–diene terpolymer (EPDM), and ground tire rubber (GTR) were dynamically vulcanized with dicumyl peroxide (DCP). The polymer blend was composed of 40% HDPE, 30% EPDM, and 30% GTR, and the concentration of DCP was varied from 0.3 to 3.6 parts per hundred rubber (phr). The properties of the TPVs were determined by evaluation of the gel fraction content and the mechanical properties. In addition, IR spectroscopy and differential scanning calorimetry analysis were performed as a function of the DCP content. Decreases in the Young's modulus of the blends and the crystallinity of HDPE were observed when the content of DCP was greater than 1.8 phr. The results regarding the gel content indicate that the presence of DCP promoted the crosslinking of the thermoplastic matrix, and optimal properties were obtained with 1.5% DCP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39901.

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“…This result is in agreement with previously reported data (8). It has been proposed (6, 8,9) that the glass microspheres could induce, in the thermosetting resins, an effect equivalent to a higher degr-e of chemical crosslinking. It is probable that in the vicinity of the heterogeneous glass surfaces an incre,ised degree of crosslinking occurs, thus reducing the mobility of the polymer chains in the cured material.…”

Section: Results and Discuss [On Inmentioning

confidence: 99%

Viscoelastic behavior of galss‐reinforced epoxy resin

et al. 1981

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The viscoelastic behavior of epoxy composites containing various percentage of glass microspheres and random short glass fibers was investigated over a wide range of temperatures. The effect of the second phase is to increase the relaxation moduli of the system and to shift the time dependency to higher times. All the data were shifted to a single master curve at a reference temperature by using independent shift factors that were a function of either temperature or filler content.

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Temperature dependence of reinforcement in the composites polyurethane rubber–crosslinked polymeric filler

Cited by 16 publications

References 37 publications

Composites of alkaline poly(6-hexanelactam) with solid lubricants: one-step synthesis, structure, and mechanical properties

Composites of alkaline poly(6-hexanelactam) with solid lubricants: one-step synthesis, structure, and mechanical properties

Thermoplastic elastomers based on high‐density polyethylene, ethylene–propylene–diene terpolymer, and ground tire rubber dynamically vulcanized with dicumyl peroxide

Viscoelastic behavior of galss‐reinforced epoxy resin

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