Vulcanization of cis- and trans-polyisoprene and their blends: cure characteristics and crosslink distribution

Boochathum, Ploenpit; Prajudtake, Worapong

doi:10.1016/s0014-3057(00)00137-3

Cited by 69 publications

(47 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Boochathum and Prajudtake 10 have clarified the different degree of vulcanization in TPI and NR phases in their crosslinked blends. In the present article, the reactivity of vulcanization reaction of NR/TPI blends was examined by comparing the height of tan d peak for vulcanizates and nonvulcanized rubbers as shown in Figure 12.…”

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%

“…The software Fit2D can transform the 2D diffraction images into 1D diffraction patterns by integrating the each diffraction rings in the range of 0 to 360 . After obtaining the 1D diffraction patterns, the degree of SIC (X c ) is calculated on the basis of peak fitting during which a 2y range from 10 to 25 was taken. X c is defined as the ratio between the total integrated intensity of crystals (200, 201,120 reflections were taken) A c and the total integrated intensity of crystalline and amorphous peaks A cþa in the 2y range, as expressed in the following equation: …”

mentioning

confidence: 99%

See 2 more Smart Citations

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

Huang

Nie

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

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

Huang

Nie

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…It was reported that the ratio of polysulfidic crosslink/(monosulfidic + disulfidic crosslinks) in CV systems are greater than that in EV [20]. Hg(II) species would react with the sulfur atoms in the crosslink of any kind.…”

Section: Effect Of Sulfurmentioning

confidence: 99%

Influence of sulfur-crosslinking in vulcanized rubber chips on mercury(II) removal from contaminated water

Danwanichakul

Dechojarasrri

Meesumrit

et al. 2008

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…Nas últimas décadas vem crescendo significativamente o interesse em se produzir e aperfeiçoar novos materiais através da mistura de polímeros comercialmente disponíveis, com propriedades complementares [1] , ao invés de sintetizar novos polímeros. Essa estratégia é relativamente simples e comercialmente atrativa, quando comparada com a síntese.…”

Section: Introductionunclassified

Misturas NR/SBR: influência da composição e do modo de preparação sobre propriedades mecânicas e reométricas

2010

View full text Add to dashboard Cite

original, melhorar o seu processamento e/ou baixar custos. As propriedades das misturas poliméricas dependem principalmente da miscibilidade entre os dois polímeros. As misturas podem ser heterogêneas ou homogêneas. Nas misturas homogêneas, as propriedades são afetadas pelas interações entre os componentes, enquanto para misturas heterogêneas, o fenômeno interfacial e a natureza flexível ou rígida das fases são importantes. Portanto, a maioria das misturas de borracha exibem propriedades inferiores às esperadas, em decorrência da incompatibilidade entre os componentes [3] .Existem várias maneiras de se preparar uma mistura de elastômeros, sendo a mecânica a mais utilizada. Em qualquer sistema bifásico, existe a possibilidade de reações IntroduçãoNas últimas décadas vem crescendo significativamente o interesse em se produzir e aperfeiçoar novos materiais através da mistura de polímeros comercialmente disponíveis, com propriedades complementares [1] , ao invés de sintetizar novos polímeros. Essa estratégia é relativamente simples e comercialmente atrativa, quando comparada com a síntese.A possibilidade de misturar dois ou mais tipos de polímeros é uma técnica vantajosa, uma vez que permite o desenvolvimento de novos materiais com propriedades superiores àquelas apresentadas pelos constituintes da mistura isoladamente [2] .Um elastômero é misturado a outro por três razões principais: para melhorar as propriedades do elastômero NR/SBR Mixtures: Influence of Composition and Preparation Mode on the Mechanical and Rheological PropertiesAbstract: Frequently a set of properties required for a given application cannot be accomplished by one elastomer only and, thus, mixtures of two or more polymers must be employed. In these cases, the other ingredients added are normally dispersed in a non homogeneous way, depending on their affinity to each polymer. The degree of dispersion each additive experiences in each elastomeric phase will influence the rate and the degree of vulcanization and will certainly have consequences on the properties of the final product. In this work, natural rubber (NR) was mixed with styrene-butadiene elastomer (SBR) in 75:25 and 50:50 w/w ratios. The compositions were prepared in a two-roll mill, by introducing the additives according to four different modes. The results of mechanical properties show that, although having been prepared following the same formulation, the properties of these mixtures are influenced by the preparation mode. For NR/SBR blends, the best properties are achieved when one favours the vulcanization of the rubber with inferior properties.

show abstract

Vulcanization of cis- and trans-polyisoprene and their blends: cure characteristics and crosslink distribution

Cited by 69 publications

References 17 publications

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

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

Influence of sulfur-crosslinking in vulcanized rubber chips on mercury(II) removal from contaminated water

Misturas NR/SBR: influência da composição e do modo de preparação sobre propriedades mecânicas e reométricas

Contact Info

Product

Resources

About