Categories
BLOG

hemp rubber

New green polymeric composites based on hemp and natural rubber processed by electron beam irradiation

Affiliations

  • 1 National Research and Development Institute for Textile and Leather-Leather and Footwear Research Institute, 93 Ion Minulescu Street, 031215 Bucharest, Romania.
  • 2 National Institute for Lasers, Plasma and Radiation Physics, Accelerators Laboratory, 409 Atomistilor Street, 077125 Magurele, Romania.
  • PMID: 24688419
  • PMCID: PMC3928856
  • DOI: 10.1155/2014/684047

Free PMC article

New green polymeric composites based on hemp and natural rubber processed by electron beam irradiation

  • Search in PubMed
  • Search in NLM Catalog
  • Add to Search

Authors

Affiliations

  • 1 National Research and Development Institute for Textile and Leather-Leather and Footwear Research Institute, 93 Ion Minulescu Street, 031215 Bucharest, Romania.
  • 2 National Institute for Lasers, Plasma and Radiation Physics, Accelerators Laboratory, 409 Atomistilor Street, 077125 Magurele, Romania.
  • PMID: 24688419
  • PMCID: PMC3928856
  • DOI: 10.1155/2014/684047

Abstract

A new polymeric composite based on natural rubber reinforced with hemp has been processed by electron beam irradiation and characterized by several methods. The mechanical characteristics: gel fraction, crosslink density, water uptake, swelling parameters, and FTIR of natural rubber/hemp fiber composites have been investigated as a function of the hemp content and absorbed dose. Physical and mechanical properties present a significant improvement as a result of adding hemp fibres in blends. Our experiments showed that the hemp fibers have a reinforcing effect on natural rubber similar to mineral fillers (chalk, carbon black, silica). The crosslinking rates of samples, measured using the Flory-Rehner equation, increase as a result of the amount of hemp in blends and the electron beam irradiation dose increasing. The swelling parameters of samples significantly depend on the amount of hemp in blends, because the latter have hydrophilic characteristics.

Figures

Hardness variation as a function…

Hardness variation as a function of hemp amount and irradiation dose.

Elasticity variation as a function…

Elasticity variation as a function of hemp amount and irradiation dose.

Modulus at 100% elongation variation…

Modulus at 100% elongation variation as a function of hemp amount and irradiation…

Tensile strength variation as a…

Tensile strength variation as a function of hemp amount and irradiation dose.

Elongation at break variation as…

Elongation at break variation as a function of hemp amount and irradiation dose.

Tearing strength variation as a…

Tearing strength variation as a function of hemp amount and irradiation dose.

Water uptake of polymeric composites…

Water uptake of polymeric composites at absorbed dose of 75 kGy.

Water uptake of polymeric composites…

Water uptake of polymeric composites at absorbed dose of 150 kGy.

Water uptake of polymeric composites…

Water uptake of polymeric composites at absorbed dose of 300 kGy.

Mechanism for the radiation crosslinking…

Mechanism for the radiation crosslinking of NR.

A new polymeric composite based on natural rubber reinforced with hemp has been processed by electron beam irradiation and characterized by several methods. The mechanical characteristics: gel fraction, crosslink density, water uptake, swelling parameters, and FTIR of natural rubber/hemp fiber compo …

Polymeric composites based on natural rubber and hemp fibers

Abstract

The purpose of this work is to present the results of preparing a polymeric composite with enhanced properties based on natural rubber and hemp. Amounts of 10 and 20 phr hemp were used to obtain the composites. The samples have been processed by sulfur vulcanization and characterized by several methods. The mechanical characteristics, gel fraction, cross-link density, rubber-fiber interactions and water uptake have been investigated depending on the hemp content. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques were also employed for characterization. The values of hardness, tensile strength and tearing strength have increased with the fiber content increasing due to the interaction between the fibers and natural rubber. Also, good adhesion between hemp fibers and rubber matrix was observed in SEM micrographs. The gel fraction value was over 95 % for all composites and increased with the increasing of hemp content. The cross-link density was determined on the basis of equilibrium solvent-swelling measurements applying the modified Flory–Rehner equation. It was observed that cross-linking density of composites increased slightly with the increase of amount of hemp but still was lower than that of the natural rubber without hemp. The extent of interaction between rubber and fiber was determined using the Kraus equation. Results of water absorption tests showed that water uptake increased with the increase of fiber content and temperature. The physical and chemical investigations have shown the reinforcing effect of hemp on sulfur vulcanized natural rubber, as well.

This is a preview of subscription content, log in to check access.

Access options

Buy single article

Instant access to the full article PDF.

Tax calculation will be finalised during checkout.

Subscribe to journal

Immediate online access to all issues from 2019. Subscription will auto renew annually.

Tax calculation will be finalised during checkout.

The purpose of this work is to present the results of preparing a polymeric composite with enhanced properties based on natural rubber and hemp. Amounts of