Effective dispersion and crosslinking in PVA/cellulose fiber biocomposites via solid-state mechanochemistry

Structure and performance of Poly(vinyl alcohol)/wood powder composite prepared by thermal processing and solid state shear milling technology

“…Structure development of PVA/wood powder (70 wt/30 wt) mixture during S 3 M treatment There were many functional groups in wood powder and PVA, forming extensive interactions, such as intra-or inter-hydrogen bonds [14]. However, after treated by S 3 M, the hydrogen bonds network was broken up, and much free hydroxyls groups was released, leading to a more robust interfacial interaction established between wood powder and PVA [14,21]. So, the FT-IR can be used to reveal the change of functional groups and the interactions.…”

“…When milled 15 cycles, the tensile strength and elongation at break of the composite reached 22.5 MPa and 120.5%, increasing about 36% and 277%, respectively, clearly indicating that S 3 M could significantly pulverize and activate wood powder and PVA. The exposed new surface area and functional groups improved the dispersion of wood powder in PVA matrix, also strengthened the interactions between molecular chains of wood powder and PVA, which effectively promoted the stress transfer behavior in composite [14,21]. Therefore, the comprehensive mechanical properties were enhanced.…”

“…It meant a wider thermal processing window and a much better thermal processibility of PVA/wood powder (70 wt/30 wt) composite. During the milling course, the strong shear stress of S 3 M disrupted regular arrangement of molecular chains, resulting in a decrease in crystallinity and an increase in mobility of molecular chains [21,24]. Therefore, S 3 M provided a wider thermal processing window for PVA/wood powder (70 wt/30 wt) composite.…”

Optimization and characterization of electrospun chitosan/poly(vinyl alcohol) nanofibers as a phenol adsorbent via response surface methodology

“… where W 1 and W 2 are weight of sample after crosslink and weight of sample after kept in distilled water for 72 hr and dried, respectively. When the samples weight reached to a constant amount, the optimum crosslinking time and as a result the desired non‐soluble adsorbent could be obtained …”

Modification of polyurethane by the lateral cross-linking using a modified poly(vinyl alcohol) for the improvement of tensile strength and the control of water vapor permeation

“…PVA cross-linking of multisilicon vinyl copolymer using the grafted trimethoxysilyl group was applied to develop the cation exchange hybrid membrane that contained the ion exchange groups such as sulfonate, carboxyl, and hydroxyl on the polymer surface so that the boundary problem between hydrophobic polymer and hydrophilic water phase could be solved [3]. Cellulose fiber could be cross-linked by PVA using succinic anhydride as an agent for linking the hydroxyl groups of two polymers, in which high interfacial adhesion, homogeneous fiber distribution in the composite, remarkably enhanced mechanical properties, and thermal stabilities were simultaneously achieved [4]. PVA hydrogels, used for drug delivery materials due to the similarity with tissue, were cross-linked between themselves with glutaraldehyde to prevent the burst release and to delay the initial release of drug: the retardation of release rate was successfully demonstrated using a proxyphylline marker [5].…”