Preparation of Hollow-Porous Rosin-Based Polyurethane Microspheres with pH-Responsive Characteristics

编号 020033105

推送时间 20220221

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Preparation of Hollow-Porous Rosin-Based Polyurethane Microspheres with pH-Responsive Characteristics

来源期刊 Journal of Renewable Materials?

期 第331期

发表时间 20211102

关键词 Polyurethane microspheres;  rosin-based;  pH-responsive;  hollow-porous; 

摘要 Preparation of polymer microspheres from naturally occurring resource is a challenge. Here, a rosin-based polyol (RAG) was used to prepare polyurethane resin (RPU) firstly, and then act as both self-assembled precursor and emulsifier, rosin based polyurethane microspheres (RPUMs) were prepared. In the process of self-emulsification, the RPU formed vesicles by self-assembly. The outer shell of the vesicle consisted of hydrophilic segments, while the inner shell contained the hydrophobic phase. After cross-linking the RPU and removal of the solvent in the core, the porous-hollow microspheres with pH-sensitive were obtained. The microspheres were characterized by optical microscope (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The effect of type and amount of the hydrophilic chain extender, and solvent on the morphology, particle size and distribution, and buffer volume of the microspheres were determined. The best conditions for synthetic RPUMs were as follows:?nNCO/nOH?= 1,?nRAG:n1-(2-hydroxyethyl)?piperazine?= 4:6, with azodiisobutyronitrile level of 1.0 wt.%, based on reactive monomers, mixing speed of both emulsification and polymerization at 400 r·min?1, the RPUMs synthesized had porous-hollow structure with a buffer volume of 1.6 mL.

服务人员 尚玮姣

服务院士 宋湛谦

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