Compatibilities and properties of poly lactide/poly (methyl acrylate) grafted chicken feather composite: Effects of graft chain length

Abstract

Surface modified poly(methyl acrylate) (PMA) grafted chicken feather fiber was applied as a reinforcement for polylactide (PLA)‐based composite film. The PMA grafted feather fiber with different PMA lengths were obtained for surface initiated Cu(0)‐mediated reversible‐deactivation radical polymerization. PLA‐based composite films with different unmodified or PMA‐grafted chicken feather fiber loading were prepared by solvent casting. Grafting PMA onto feather fiber enhanced interfacial bonding. Cracks and voids between matrix and fiber were eliminated. Thermal stability of these films also improved after introducing PMA. Feather fiber with high graft ratio showed worse dispersity in PLA due to its self‐aggregation. The heterogeneous nucleation agent behavior of feather grafted with longer PMA was also suppressed. Tensile tests showed that after modification, tensile strength and modulus was able to increase twice at 20% fiber loading. However, increasing PMA length improved break elongation but strength and modulus would drop slightly. These results indicated that grafting short PMA chain onto feather fiber surface was an effective and optimized method to improve dispersity and mechanical properties especially for higher filler loading.

Effects of Grafting Structure on 1D One-Component Composites: An Example of Surface-Grafted Cellulose Nanofibers

“…As one end of the PMA graft chain was chemically bound to the surface of the CNF, the glass transition temperature ( T g ) was significantly higher than that of the free PMA polymer, especially for graft chains with lower DP . For instance, for homo PMA with a number-average molecular weight of 16,100 and polydispersity index of 1.11, the glass transition is 2.4 °C . From the summarized T g data (Table ), there was a trend that the T g of PMA dropped with increasing graft chain length when the graft density was fixed.…”

Advances in Natural-Fiber-Reinforced Composites: A Topical Review

“…The oxygen-oxygen bond is created by removal of a hydrogen atom from the polymer chain when peroxide radicals initiate the grafting with the acrylic acid in the matrix. By this method, the bonding and stress transfer ability of the fiber-matrix interfaces is increased due to the coupling mechanism between the interfaces [114][115][116].…”

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“…Связь кислород-кислород создается путем удаления атома водорода из полимерной цепи, когда пероксидные радикалы инициируют прививку акриловой кислоты в матрице. С помощью этого метода на поверхности раздела волокно-матрица улучшается сцепление и способность передачи напряжений [114][115][116].…”