Abstract Polycarboxylate superplasticizer nanomicelles (nano-PCEs) with a core-shell structure were prepared via aqueous emulsion copolymerization in one pot. The shells are constructed with hydrophilic segments of poly(acrylic acid)-co-poly(isobutenyl polyethenoxy ether) (PAA-co-PHPEG), offering the water-reducing performance and stability for nano-PCEs. The cores are self-assembled with hydrophobic segments of polystyrene-co-poly(hydroxyethyl acrylate) (PS-co-PHEA), endowing nano-PCEs with good loss resistant of fluidity for cement pastes. The chemical structure of nano-PCEs was verified by the nuclear magnetic resonance spectrum (1H NMR) and fourier transform infrared spectroscopy (FTIR), and the 16−48 nm diameter of nano-PCE nanomicelles was determined by dynamic laser scattering (DLS) and transmission electron microscopy (TEM). Compared with comb PCEs, the cement paste containing nano-PCEs exhibited better fluidity retention of three hours by mini-slump measurements, lower hydration heat and more delayed hydration heat evolution by isothermal calorimetry tests. Furthermore, the hydrolysis and adsorption behavior of nano-PCEs in alkaline cement pastes were deduced, and a working mechanism of nano-PCEs was theoretically explained. This new type of superplasticizer nanomicelles can be used as a long time rheology modifying agent in fresh cementitious systems.

中文翻译：

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核壳聚羧酸减水剂对水泥浆流动性及水化行为的影响

摘要 采用一锅法水乳液共聚制备了具有核壳结构的聚羧酸减水剂纳米胶束（nano-PCEs）。外壳由聚（丙烯酸）-共聚（异丁烯基聚乙氧基醚）（PAA-co-PHPEG）的亲水链段构成，为纳米 PCE 提供了减水性能和稳定性。核与聚苯乙烯-共聚（丙烯酸羟乙酯）（PS-co-PHEA）的疏水链段自组装，使纳米PCE具有良好的水泥浆流动性抗损失性。纳米PCEs的化学结构通过核磁共振光谱（1H NMR）和傅立叶变换红外光谱（FTIR）进行验证，纳米PCE纳米胶束的16-48nm直径通过动态激光散射（DLS）和透射电子显微镜 (TEM)。与梳状 PCEs 相比，含有纳米 PCEs 的水泥浆通过微型坍落度测量表现出更好的 3 小时流动性保持，通过等温量热法测试显示出更低的水化热和更延迟的水化放热。此外，推导了纳米PCEs在碱性水泥浆中的水解和吸附行为，从理论上解释了纳米PCEs的作用机理。这种新型超塑化剂纳米胶束可用作新胶凝体系中的长效流变改性剂。推导了纳米四氯乙烯在碱性水泥浆中的水解和吸附行为，从理论上解释了纳米四氯乙烯的作用机理。这种新型超塑化剂纳米胶束可用作新胶凝体系中的长效流变改性剂。推导了纳米四氯乙烯在碱性水泥浆中的水解和吸附行为，从理论上解释了纳米四氯乙烯的作用机理。这种新型超塑化剂纳米胶束可用作新胶凝体系中的长效流变改性剂。