Vulcanization of cis- and trans-polyisoprene and their blends: crystallization characteristics and properties

Boochathum, Ploenpit; Chiewnawin, Sharnpoj

doi:10.1016/s0014-3057(00)00138-5

Cited by 39 publications

(33 citation statements)

References 17 publications

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“…The resulting polyisoprene backbones were mostly cis-stereoregular. [5,7] It is worth noting that vulcanized poly(1,4-trans-isoprene) exhibits better applicative properties, such as hardness or abrasion resistance, by a factor 1.5 to 2 as compared to vulcanized poly(1,4-cis-isoprene) [10] or vulcanized polybutadiene. [11] Catalysts affording the insertion of styrene in poly(1,4-trans-isoprene) are thus of interest not only from an academic point of view, but also regarding the applicative potentialities of the resulting material.…”

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confidence: 99%

A New Family of Styrene/Diene Rubbers

Zinck

Terrier

Mortreux

et al. 2007

Macro Chemistry & Physics

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International audienceThe insertion of single styrene units into polyisoprene is demonstrated using borohydrido rare earth/dialkylmagnesium systems. This yields a new family of styrene/diene copolymers (SBR rubbers). The resulting poly[(1,4-trans-isoprene)-co-styrene] exhibits quite narrow molecular weight distributions, up to 30% inserted styrene, and a 96–98% 1,4-trans-microstructure. The presence of a bulky and electron-rich ligand in the coordination sphere of the metal leads to an increase of the amount of styrene inserted and narrower chemical composition and molecular weight distributions. The presence of significant quantities of styrene in the medium does not alter the selectivity of the reaction, in contrast with cis-specific polymerizations

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confidence: 99%

A New Family of Styrene/Diene Rubbers

Zinck

Terrier

Mortreux

et al. 2007

Macro Chemistry & Physics

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“…This is consistent with the Boochathum's report. 11 Boochathum ascribed this to the lack of the covulcanization of the two polymers due to the difference in the cure rate when large amount of TPI was blended with NR.…”

Section: Resultsmentioning

confidence: 99%

“…Among these, the crosslinked blend of NR and TPI has attracted much attention because it is an ideal compatible blend with good dynamic properties, such as flex fatigue resistance. 9 To understand the enhanced properties of NR/ TPI crosslinked blend, some studies on the microstructure, including the crosslink distribution 10 and crystallization behavior, 11 have been conducted. Although some interesting results have been obtained, there are still some puzzles.…”

Section: Introductionmentioning

confidence: 99%

Strain‐induced crystallization behavior of natural rubber and trans‐1,4‐polyisoprene crosslinked blends

Huang

Nie

et al. 2010

J of Applied Polymer Sci

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The strain-induced crystallization (SIC) behaviors of crosslinked blends based on natural rubber (NR) and trans-1,4-polyisoprene (TPI) with different content of TPI were probed explored by using synchrotron two-dimensional wide angle X-ray diffraction and dynamic mechanical analysis. The results showed that when TPI content is less than 70% no reflection peak of TPI but NR crystallite diffractions can be observed and the diffractions of TPI bform appear when TPI content is 70 wt % in the cocured blend. SIC of cocured blends started at smaller strain ratio than the pure NR. By calculating DS def , it is found that the drop in entropy upon strain decreased when TPI is incorporated into NR due to the reduction of molecular mobility of NR. The degree of SIC and crystallization rate index in crosslinked blends monotonously decreased with the increase of TPI content. The apparent crystallite size exhibited some surprising variations. L 200 and L 120 decreased with the increase of TPI content in the cocured blends. These observations were usually caused by two factors: (i) Less number of polymer chains could involve in crystal growth due to the lower mobility of polymer chains in the cocured blends which is proved by dynamic mechanical analysis results; (ii) The mean distance between nuclei decreases, which was caused by the fluctuation of crosslink density in NR phase derived from the heterogeneous distribution of curatives in two phases supported by the varying tendency of curing degree and crosslink density.

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“…Natural rubber is the cis form, with chain bonds on the same side of the double bonds, and TPI is the transform, with chain bonds on opposite sides of the double bonds [9,10]. Polymeric materials dissolved in a proper solvent can be subjected to the electrospinning process.…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of electrospun trans-polyisoprene nanofibers

Chen¹,

Saha²,

Kim³

et al. 2014

Journal of Polymer Engineering

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Abstract:The method of manufacturing nanofibers using the electrospinning technique from trans-polyisoprene (TPI) is presented in this study, possibly for the first time.The process parameters such as solution concentration, applied voltage, distance and feeding rate for electrospinning were investigated and optimized with respect to fiber morphology, as observed from scanning electron microscopy (SEM) photomicrographs. Smooth and uniform nanofibers were found to generate at the optimum conditions with 1% melt concentration, 15 kV of voltage, tip-to-collector distance (TCD) of 15 cm and injection rate 4 ml/h. The physicochemical properties of pure TPI and electrospun TPI fibers were characterized by differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) analysis. Both DSC and FTIR characterization results show predominant transformation of TPI crystalline structure from the β form to the α form upon electrospinning.

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Vulcanization of cis- and trans-polyisoprene and their blends: crystallization characteristics and properties

Cited by 39 publications

References 17 publications

A New Family of Styrene/Diene Rubbers

A New Family of Styrene/Diene Rubbers

Strain‐induced crystallization behavior of natural rubber and trans‐1,4‐polyisoprene crosslinked blends

Processing and characterization of electrospun trans-polyisoprene nanofibers

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