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Natural rubber biocomposites based on nanocrystalline and modified nanocrystalline cellulose: curing, mechanical, thermal and electrical properties

Journal of Polymer Research, ISSN: 1572-8935, Vol: 28, Issue: 10
2021
  • 16
    Citations
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  • 15
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    16
    • Citation Indexes
      16
  • Captures
    15

Article Description

The present work aims to prepare biocomposites based on natural rubber reinforced with nanocrystalline and modified nanocrystalline cellulose as biodegradable fillers to strengthen natural rubber instead of traditional fillers, as well as evaluating the effect of adding them in different proportions on the rheological, mechanical and electrical properties. Acid hydrolysis process was used to prepare nanocrystalline cellulose (NCC) from microcrystalline cellulose. Modification of nano-crystaline cellulose was achieved using cetyltrimethyl ammonium bromide as a cationic surfactant. The prepared NCC and modified NCC were characterized through fourier transformed infrared spectra and X-ray diffraction. The biocomposites were prepared by incorporating modified and non-modified NCC as reinforcing fillers into natural rubber using two-roll mill mixer. The rheometric, physico-mechanical, electrical and thermo-oxidative properties were evaluated. Furthermore, the filler distribution in the prepared composites was investigated by scanning electron microscope.The mechanical results showed that the tensile strength increased gradually with increasing NCC and modified NCC till 5 phr and then declined with increasing filler content up to 10 phr. In contrast, the elongation at break values decreased with increasing the filler content. The NCC modification led to a noticeable decline in the curing time more than NCC, confirming that modified NCC could accelerate the curing process more than NCC without modification. Also, dielectric measurements showed that both permittivity ε′ and dielectric loss ε″ values increased by increasing filler loading in the composite. In addition to the NR/m-NCC composites exhibit higher values in both ε′ and ε″ than NR/ NCC composites.

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