Plant extract and oil additives for reactive chain extension of recycled polyolefins

Overview

This research investigates the use of plant extracts and oils as natural catalysts or promoters for reactive chain extension in recycled polyolefins. Polyolefins such as polyethylene and polypropylene are widely used plastics, and their recycling often involves breaking down polymer chains that must then be rebuilt to restore useful material properties. Traditional chain extension relies on petroleum-derived chemical additives, which can be costly and environmentally burdensome. By leveraging the unique functional groups and reactivity found in plant-derived compounds, this approach offers a sustainable, biodegradable, and potentially cost-effective alternative for polymer recycling. The work supports circular economy objectives by enabling higher-quality recycled polyolefins suitable for reintroduction into manufacturing streams.

Technical specifications

Key features and research focus:

• Plant-derived additives with functional groups capable of catalyzing or facilitating crosslinking and chain extension reactions in cleaved polyolefins
• Sustainable chemistry replacing petroleum-based catalysts with renewable, biodegradable, and biocompatible natural compounds
• Enhanced material properties through improved molecular weight recovery and mechanical strength in recycled polymers
• Environmental impact assessment integrated into the research design to quantify sustainability benefits
• Material compatibility studies to evaluate interactions between plant extracts/oils and various polyolefin types
• Scalability evaluation addressing cost-effectiveness and industrial-scale feasibility
• Sustainability and recyclability evaluation confirming that the approach supports circular polymer reuse

Planned methodologies include: literature review, experimental design, chemical interaction analysis, mechanical strength testing, data collection and analysis, and final reporting.

Technology readiness level

This research is at an early stage, corresponding to a Technology Readiness Level (TRL) of 2–3. The hypothesis is grounded in established knowledge of traditional crosslinking strategies for polyolefin chain extension, which have been validated by researchers in polymer science and chemical engineering. The proposed use of plant extracts and oils as catalytic additives represents a novel application requiring experimental validation. The research team at the University of Johannesburg is positioned to conduct laboratory-based investigation, with future plans encompassing experimental design, chemical interaction studies, mechanical testing, and environmental assessment to advance the technology toward proof-of-concept and pilot-scale demonstration.