PVA based flexible anti-stabbing membrane prepared by crosslinking method

Flexible stab-proof membrane is a promising form of anti-stabbing material. The polyvinyl alcohol (PVA), which has good chemical stability, membrane-forming property and degradability, is an ideal choice for preparing membrane materials. However, the mechanical properties of pure PVA membranes are limited, and crosslinking is an effective method to improve the mechanical properties of PVA membrane materials. In present research, tannic acid (TA) and sodium borate (SB) additives were selected as crosslinking agents to prepare PVA composite membranes, and different mass ratios were set to explore the effects of the types and amounts of crosslinking agents on the mechanical properties of the PVA composite materials, especially the stab-proof properties. The principle of the cross-linking was investigated by FTIR and XRD tests, the thermal properties of the composite membranes were investigated by TG and XRD, and the mechanical properties of the composite membranes were comprehensively compared by tensile and puncture test. The results show that the puncture resistance of PVA-SB composite membranes and PVA-TA composite membranes reached the best when the mass ratio is 15:1 and 25:1, respectively, which is 75.76 % and 79.15 % higher than that of pure PVA composite membrane.