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<p>This study investigates the effects of alkali treatment and pigment dyeing on the mechanical performance of jute fiber-reinforced polypropylene (PP) composites. Jute fabrics were subjected to 0.5% (w/v) NaOH treatment prior to dyeing with P. Royal Blue pigment. Alkali treatment alone improved jute fabric tensile strength by 4.9% and composite flexural strength by 34.3%, while reducing water uptake by 46%. Pigment dyeing further reduced water uptake (up to 46%) but decreased composite tensile strength by 14–22%, revealing a trade-off between hydrophobicity and tensile performance. The alkali-treated composite with 0.5% pigment (AJP05) offered balanced properties: 32.15&#xa0;MPa tensile strength and 25% lower water absorption than untreated composites. These findings demonstrate that while alkali treatment enhances mechanical properties, pigment dyeing prioritizes water resistance at the cost of tensile strength, guiding application-specific selection of surface modification strategies.</p> Graphical Abstract <p></p>

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Mechanical performance improvement of jute/PP composites via pigment dyeing and alkali treatment

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Md. Ismail Hossain,
  • Tornado Roy,
  • Md. Yeasin Ali,
  • Md. Tahidul Islam,
  • Sharfun Nahar Arju,
  • Forkan Sarker

摘要

This study investigates the effects of alkali treatment and pigment dyeing on the mechanical performance of jute fiber-reinforced polypropylene (PP) composites. Jute fabrics were subjected to 0.5% (w/v) NaOH treatment prior to dyeing with P. Royal Blue pigment. Alkali treatment alone improved jute fabric tensile strength by 4.9% and composite flexural strength by 34.3%, while reducing water uptake by 46%. Pigment dyeing further reduced water uptake (up to 46%) but decreased composite tensile strength by 14–22%, revealing a trade-off between hydrophobicity and tensile performance. The alkali-treated composite with 0.5% pigment (AJP05) offered balanced properties: 32.15 MPa tensile strength and 25% lower water absorption than untreated composites. These findings demonstrate that while alkali treatment enhances mechanical properties, pigment dyeing prioritizes water resistance at the cost of tensile strength, guiding application-specific selection of surface modification strategies.

Graphical Abstract