Elastomer Reinforced with Regenerated Chitin from Alkaline/Urea Aqueous System

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials

Background:

• Chitin is an abundant biopolymer with potential applications in composite materials.
• Developing effective methods to integrate chitin into polymer matrices remains a challenge.
• Existing methods often struggle to achieve strong filler-matrix interactions.

Purpose of the Study:

• To develop a novel method for creating hybrid elastomer/regenerated chitin composites.
• To investigate the formation of an interpenetrating polymer network (IPN) structure.
• To evaluate the reinforcement effect of regenerated chitin on elastomer properties.

Main Methods:

• Dissolving regenerated chitin (R-chitin) in an alkaline/urea aqueous solution at low temperature.
• Introducing the chitin solution into rubber latex.
• Coagulating the mixture using ethanol to induce rapid coprecipitation and gelation.
• Characterizing the composite structure using SEM, TGA, XRD, and swelling experiments.

Main Results:

• A novel interpenetrating polymer network (IPN) structure was successfully formed between R-chitin and elastomer.
• The R-chitin phase exhibited a unique porous structure, facilitating strong physical interlocking with the elastomer matrix.
• The hybrid composite demonstrated significantly enhanced mechanical reinforcement due to efficient load transfer.
• Thermogravimetric analysis, X-ray diffraction, and swelling experiments confirmed the composite's properties.

Conclusions:

• A new, efficient method for fabricating chitin-based elastomer hybrids with an IPN structure was established.
• The porous R-chitin filler effectively reinforces the elastomer matrix through physical entanglements and load transfer.
• This research offers new insights into designing advanced chitin-based composite materials with tunable properties.