title: Synthesis, Surface Activities, and Aggregation Behaviors of Butynediol-ethoxylate Modified Polysiloxanes.
abstract: Five different butynediol-ethoxylate modified polysiloxanes (PSi-EO) were designed and synthesized via two-step reactions: the preparation of low-hydrogen containing silicone oil (LPMHS) by acid-catalyzed polymerization and the following hydrosilylation reaction with 1,4-bis(2-hydroxyethoxy)-2-butyne. The chemical composition of each product was confirmed by FT-IR, (1)H NMR, and (29)Si NMR. The surface activities and aggregation behaviors of PSi-EO surfactants in aqueous solution were studied systematically using surface tension, dynamic light scattering (DLS), transmission electron microscopy (TEM), and contact-angle methodologies. Relatively low critical aggregation concentration (15-34 mg·L(-1)) and surface tension (∼25 mN·m(-1)) were measured for PSi-EO aqueous solution. The rate of surface tension reduction increased both with increasing PSi-EO concentration and with increases in the proportion of hydrophilic moieties within the synthesized compounds. Furthermore, DLS and TEM studies revealed that PSi-EO self-assembled in aqueous solution to form spherical aggregates. Contact-angle measurements conducted upon low-energy paraffin film surfaces demonstrated that PSi-EO exhibited efficient spreading at concentrations above the critical aggregation concentration.
authors.affiliation: Institute of Resources and Environment Engineering, Shanxi University , No. 92 Wucheng Road, Taiyuan 030006, P. R. China.|China Research Institute of Daily Chemical Industry , 34 Wenyuan Street, Taiyuan 030001, P. R. China.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Du
authors.affiliation: China Research Institute of Daily Chemical Industry , 34 Wenyuan Street, Taiyuan 030001, P. R. China.
authors.forename: Jieqiong
authors.initials: J
authors.lastname: Qin
authors.affiliation: China Research Institute of Daily Chemical Industry , 34 Wenyuan Street, Taiyuan 030001, P. R. China.
authors.forename: Wanxu
authors.initials: W
authors.lastname: Wang
authors.affiliation: China Research Institute of Daily Chemical Industry , 34 Wenyuan Street, Taiyuan 030001, P. R. China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: China Research Institute of Daily Chemical Industry , 34 Wenyuan Street, Taiyuan 030001, P. R. China.
authors.forename: Guoyong
authors.initials: G
authors.lastname: Wang