Effect of crystalline control on the water retention and degradation of Poly (lactic acid) composite in concrete curing

In this paper, a green degradable composite film containing lignin (LG), polyethylene glycol (PEG) and polylactic acid for building maintenance was prepared by solution casting method. The effects of PEG and LG on the crystallization, degradation, water retention and surface properties of the composite films were studied. The crystallinity of the composite membrane containing PEG and LG was increased to 69.97 %, and its water retention performance was the best, and the water loss rate was only 0.17 %. The degradation performance of the composite film was significantly improved due to the good hydrophilicity of PEG and LG. As a green water retaining material, the composite film has a good application prospect in the field of building.