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首页> 外文期刊>Journal of Applied Polymer Science >Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development
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Thermal, mechanical, and surface properties of poly(vinyl alcohol) (PVA) polymer modified cementitious composites for sustainable development

机译：聚（乙烯醇）（PVA）聚合物改性水泥复合材料的热，机械和表面性质进行可持续发展

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This study aimed to investigate the effect of poly(vinyl alcohol) (PVA) polymer on the thermal, mechanical, and surface properties on cementitious composites for sustainable development. Thermal properties of the PVA-modified cement paste, including thermal insulation and energy absorption ability, were first studied and correlated with the porosity and microstructures. The experimental results indicated that the thermal conductivity of cement paste can be greatly reduced by 42.9% with 2.0 wt % addition of PVA due to the more porous structure. However, at the same time, more thermal energy can be captured and concentrated at the surface of cement paste with the increasing amount of PVA, causing an increased thermal load and a negative effect on thermal insulating efficiency of cement paste. The contradictory effect of PVA on thermal properties of cement paste should be balanced before it is used as a foaming modifier to fabricate cementitious composites with thermal insulation. In addition, the contact angle measurement revealed that PVA can be used as an effective additive to improve the hydrophobicity of cement-based materials. Only 3.0% PVA can turn the surface nature from hydrophilicity to hydrophobicity for cement paste, which benefited to the development of self-cleaning cementitious composites. Finally, the mechanical properties of the PVA-modified cement paste, especially for the tensile strength that has been rarely reported, were investigated and correlated with its thermal and surface properties. Due to the compensative effects of irregular packing, formation of PVA films and microcracks, tensile strength of cement paste can be improved by 23.5% with a small scarifying of the compressive strength by adding 2.0% of PVA. In conclusion, the PVA-modified cement-based materials with lower thermal conductivity, hydrophobic surface nature and enhanced mechanical properties have a great potential to satisfy the high requirements in developing sustainable infrastr
机译：本研究的目的是调查聚（乙烯醇）的作用，对热，机械，和表面上的可持续发展水泥基材料性质（PVA）聚合物。该PVA-改性水泥糊，包括热绝缘和能量吸收能力的热性质，首先研究，并与孔隙度和微结构相关。实验结果表明，水泥膏的热导率可以通过用2.0％（重量）另外的PVA 42.9％大大降低由于更多的多孔结构。然而，在同一时间，更多的热能可以被捕获并在水泥的表面集中与PVA用量的增加粘贴，导致增加的热负载和对水泥净浆的绝热效率具有负面影响。它在使用前作为发泡改性剂制造具有隔热水泥基材料的PVA对水泥净浆的热性质的影响矛盾要平衡。此外，接触角测定结果表明，PVA可被用作一种有效的添加剂，以改善水泥基材料的疏水性。只有3.0％的PVA可以把从亲水性的表面性质疏水性，水泥浆，这受益于自清洗水泥基复合材料的发展。最后，PVA-改性水泥膏的机械性能，尤其是对于已很少报道的抗张强度，进行了调查，其热性能和表面特性相关。由于不规则填料的补偿效果，形成薄膜的PVA和微裂纹，水泥浆的抗张强度可通过23.5％与抗压强度小翻松，加入PVA的2.0％的改善。总之，具有较低的导热性，疏水性表面性质和增强的机械性能的PVA改性水泥基材料有很大的潜力，以满足发展可持续infrastr的高要求

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