Toughening Modification of Polylactic Acid by Long-Chain Hyperbranched Polymers Containing Polycaprolactone end Groups

Abstract

The hyperbranched polyester were synthesized by the "one-step method" and grafted with caprolactone (ε-CL) to obtain long-chain hyperbranched polymers (LCHBPs-Cl). LCHBPs-Cl was then melt blended with PLA to study its effect on the toughness of PLA. Compared to the pure PLA, the most significant toughening effect was observed when the addition amount of LCHBPs-Cl was 2.0phr. The tensile strength was increased by 69.21% from 37MPa to 62.61 MPa, the impact strength was increased from 14.88kJ to 18.50kJ. The scanning electron microscope (SEM) images showed that the impact section of the blends was changed from smooth to rough, the brittle-ductile fracture transition occurred, and a large number of white wire drawing phenomena were produced. Due to the formation of topological entanglement and cohesive entanglement between the long-chain substituents of LCHBPs-Cl and PLA molecular chains, the plastic deformation of PLA was successfully improved.

Super-Tough and Biodegradable Poly(lactide-co-glycolide) (PLGA) Transparent Thin Films Toughened by Star-Shaped PCL-b-PDLA Plasticizers

“…This improvement of PLGA was contributed to immiscibility and the presence of a higher density of intracrystalline connection between PLLA in PLGA and PDLA in PCL- b -PDLA. Tie et al have investigated the effect of multi-armed polyester- b -PCL and emphasized that branched PCL polymer can improve mechanical properties of the main matrix [ 62 ].…”

Study on the Properties of Cellulose Acetate Composite Synergistically Toughened by Glycerol Triacetate and Modified Nano Titania

“…The character of cellulose diacetate, poor toughness, limits its application. Therefore, plasticizers and nanofillers are widely used to enhance the mechanical properties of cellulose acetate [3][4][5] . The toughening methods of cellulose diacetate are mainly chemical modification, physical plasticization, and blending modification.…”

Enhancement of mechanical and flame‐retardant properties of PLA composites through the combined action of flexible chain segments and hydrogen bonding interactions

“…Recently, hyperbranched polymer, a novel toughening material, has received widely attention owing to the characteristics of multiple active functional groups and low viscosity. 13 In our previous work, hyperbranched polysiliconoxaborane (PBSi) containing flexible Si O B O segments had been demonstrated to be effective in toughening and reinforcing epoxy resins (EP). 14 Specifically, when the addition of 5 phr PBSi to EP, the elongation at break and tensile strength of EP5 increased by 129.4% and 75.3% compared with pure EP, respectively.…”