Tailored and sustainable bio-composite thanks to synergetic interactions of polycaprolactone (PCL) and guar gum derivative

In this research study, we describe the synthesis of new and tailored bio-composite materials by leveraging the synergistic interaction between polycaprolactone (PCL) and carboxymethyl hydroxypropyl guar gum (CMHPG). The proposed approach involves the in-situ ring opening polymerization (ROP) of ε-caprolactone, enabling the grafting of high molecular weight PCL chains (100 kg.mol⁻¹) onto CMHPG using a highly stable tin-based catalyst. The successful covalent association between the hydrophobic PCL chains and the hydrophilic CMHPG polysaccharide was confirmed. In addition, comprehensive structural (FTIR, DLS, contact angle and DRX), thermal (TGA and DSC), and mechanical characterizations were performed to investigate the synergistic effects between PCL and CMHPG. Notably, by precisely controlling the amount of CMHPG filler incorporated during synthesis, we achieved tailored performance in terms of film hydrophobicity and controlled biodegradability kinetics. These findings underscore the significant potential of the developed PCL bio-composites for specialized applications such as coatings, surface engineering, and the production of antifouling or repellent materials.

Graphical Abstract