一种水泥混凝土用聚合物共混物的微观形态及其变化机理研究表明,聚合物总浓度不超过20%时,等量配比的共混物微观形态随聚合物总 浓度的增大而逐渐由致密体结构变成网络状结构;聚合物总浓度为20%时,不同配比的共混物 微观形态以等量配比的共混物的网络状结构最均匀为特征;B聚合物在共混体系中兼起消泡剂 作用。同时探讨了各共混物微观形态与两聚合物分子链在共混体系中的物理化学行为之间的关系。
Microstructures and their variation mechan ism of a kind of polyblend for cement concrete, composed of polyvinyl alcohol an d methylcellulose, have been studied with SEM. The results show that the microst ructure of polyblends with not more than 20% polymers have been gradually transf ormed from compact structure into network one, when increasing the total polymer concentration in the polyblend with equal mixting ratio. The uniform network st ructure of the polyblends with 20% polymer and different mixting ratios has been obtained on condition that the polyblends in composed of 10% polyvinyl alcohol and 10% methylcellulose. The methylcellulose in the polyblend system simultaneou sly acts as antifoamer. The relation between the microstructure of polyblend and the physical and chemical behaviors of molecular chains of two kinds of polymer s were discussed.
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