PVAc and PVA are two kinds of material commonly used in wall painting conservation.This paper reviews and summarizes the structures,compositions,types,physical and chemical properties,and history of the resin,centering on four representative materials,namely PVA-1788,PVA-1799,PVAc resin and PVAc emulsion.The structures of the four materials are characterized by FT-IR,while their dilute solution’s viscosity and surface tension are measured by BROOKFIELD viscometer and JZ-200A automatic surface tensiometer.Concurrently,the changes of the four solution’s viscosity and surface tension with concentration are studied.
