Stress-induced Solid-Solid Crystal Transition in Trans-1,4-polyisoprene

Zhang, Chunbo; Wang, Lei; Yang, Bo; Zhao, Hui; Liu, Guoming; Wang, and Dujin

doi:10.1007/s10118-022-2659-7

Cited by 11 publications

(16 citation statements)

References 47 publications

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“…The X c value of pure EUG does not change with strain. 56 Thus, only the destruction of the network occurs. On the other hand, the increase of ( σ i – σ 1 ) 300% is a manifestation of an increase in X c and f c in EUG vulcanizates during the cyclic deformation.…”

Section: Resultsmentioning

confidence: 99%

The role of crystallization and crosslinking in the hysteresis loss of vulcanized Eucommia ulmoides gum

et al. 2023

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Section: Resultsmentioning

confidence: 99%

The role of crystallization and crosslinking in the hysteresis loss of vulcanized Eucommia ulmoides gum

et al. 2023

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“…TPI mainly exhibits two crystal forms, namely, the stable α form and the metastable β form. [55][56][57][58] Fig. 7a and b show the WAXS curves of the as-prepared modified xTPI with different S/D ratios (fixed reaction time) and different reaction times (fixed S/D ratio).…”

Section: Crystallization Structure and Crystallinity Of G-xtpimentioning

confidence: 99%

Achieving high elasticity of trans-1,4-polyisoprene with a combination of radiation crosslinking and thiol–ene grafting

et al. 2023

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“…There are two crystalline forms in gutta-percha [25,26], namely αand β-crystalline forms. As shown in Figure 10a, the peaks at 11.4 • , 17.9 • , 26.9 • , 30.8 • , and 33.5 • are the characteristic peaks of the α-crystalline form of gutta-percha, while the peaks at 19.1 • and 22.8 • are the characteristic peaks of the β-crystalline form [27,28], showing that the extracted gutta-percha maintains its natural crystalline structure.…”

Section: Xrd Analysismentioning

confidence: 99%

Extraction of High-Purity Native State Gutta-Percha from Enzymatic Hydrolyzed Eucommia ulmoides Pericarps by Ultrasound Treatment and Surfactant Aqueous Phase Dispersion

Shi

Zhang

et al. 2022

Agriculture

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Herein, a method of ultrasound treatment combined with surfactant aqueous phase dispersion was proposed for the extraction of high-purity gutta-percha in its native state from enzymatic hydrolyzed Eucommia ulmoides pericarps. Firstly, the plant tissues wrapped around gutta-percha were destructed through enzymatic hydrolysis, then the plant tissues debris still attached to gutta-percha were further stripped off by ultrasound. Finally, under the “amphiphilic” action of sodium dodecyl sulfate (SDS), the entangled gutta-percha was untwined, allowing the residual plant tissue debris to be released and precipitated, thus high purity gutta-percha was obtained. The process parameters were optimized through single factor and response surface experiments. The optimal parameters for ultrasonic treatment were displayed as follows: frequency of 40 kHz, power of 320 W, time of 7.3 h, temperature of 50 °C, and material-to-liquid ratio of 1:70 g/mL, and for the aqueous phase dispersion of surfactant were SDS concentration 1.7%, temperature 80 °C, stirring speed 1200 rpm, solid-to-liquid ratio 1:60 g/mL, and time 60 h. Under optimal conditions, the purity of gutta-percha reached 95.4 ± 0.31% and its weight average molecular weight (Mw) was 20.85 × 104. Moreover, the obtained gutta-percha maintained its native filamentous form. The obtained products were characterized by IR, NMR, XRD, TGA, DSC, and tensile experiments, which showed that the obtained product was gutta-percha and maintained the natural α- and β- crystal structure. The proposed method overcomes the disadvantages of the traditional organic solvent method, which has great environmental pollution and destroys the gutta-percha structure. This is also the first reported method to obtain high purity gutta-percha while maintaining its native state.

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Stress-induced Solid-Solid Crystal Transition in Trans-1,4-polyisoprene

Cited by 11 publications

References 47 publications

The role of crystallization and crosslinking in the hysteresis loss of vulcanized Eucommia ulmoides gum

The role of crystallization and crosslinking in the hysteresis loss of vulcanized Eucommia ulmoides gum

Achieving high elasticity of trans-1,4-polyisoprene with a combination of radiation crosslinking and thiol–ene grafting

Extraction of High-Purity Native State Gutta-Percha from Enzymatic Hydrolyzed Eucommia ulmoides Pericarps by Ultrasound Treatment and Surfactant Aqueous Phase Dispersion

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