Polycarboxylic acid dispersants (PCs) with comb‐like molecular structure have become the focus of dispersants. However, there are many contradictions in the study of molecular structure of polycarboxylic acids. In this article, a series of PCs with different molecular structures were prepared from acrylic acid (AA) and methyl allyl alcohol polyoxyethylene ether (TPEG) by reversible addition fragmentation chain transfer (RAFT) polymerization. The structural characteristics of PCs were characterized by flourier transform infrared spectrometer (FT‐IR), ¹H nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC). The dispersion performance of PCs to cement was measured by the fluidity and adsorbing capacity. The results show that the dispersion performance and adsorbing capacity of PCs are significantly related to its structure. The adsorption and dispersion properties increase with the increase of carboxyl content and molecular weight. However, this phenomenon is limited to a certain range that the acid ether ratio in this range is no greater than 5:1, and the molecular weight is no greater than PC‐4 (Mw = 82 125, Mn = 63 889).

中文翻译：

---

RAFT法合成的多元羧酸分散剂的结构与性能

具有梳状分子结构的聚羧酸分散剂（PCs）已成为分散剂的焦点。但是，多元羧酸的分子结构研究存在许多矛盾。在本文中，通过可逆加成断裂链转移（RAFT）聚合反应，由丙烯酸（AA）和甲基烯丙醇聚氧乙烯醚（TPEG）制备了一系列具有不同分子结构的PC。PC的结构特征用更强大的红外光谱仪（FT‐IR）表征，¹H核磁共振（NMR）光谱和凝胶渗透色谱（GPC）。通过流动性和吸附能力来测量PC在水泥中的分散性能。结果表明，PC的分散性能和吸附能力与其结构显着相关。吸附和分散性能随羧基含量和分子量的增加而增加。但是，这种现象被限制在一定范围内，该范围内的酸醚比不大于5：1，分子量不大于PC-4（Mw = 82125，Mn = 63889）。