关键词: 聚醚聚酯磺酸钠;β-半水石膏;机械强度;吸水性;凝结时间

Abstract: Three macromolecule polyether polyester sodium sulfonates (PSVA, PSPA and PSMPA) were designed and synthesized, and the effect of molecular structure of polymers on the properties of β-calcium sulfate hemihydrate (β-H) were investigated.It is indicated that the mechanical strengths of gypsum plaster made from β-H containing all assayed polymers are increased and arranged as PSVA>PSMPA>PSPA.The acceleration of initial setting time is coincident inversely with the mechanical strengths enhancement.Polymers delaying the final setting time, improving the consistency of β-H and developing the water absorption of gypsum plaster in a chain branching dependent manner.Compared to hydrophilia of synthetic polymers, the water absorption of gypsum plaster is affected more by the porosity and has a positive correlation with it.

Key words: polyether polyester sodium sulfonate;β-calcium sulfate hemihydrate;mechanical strength;water absorption;setting time