以四溴甲烷为调聚剂通过光引发调聚反应制备的功能性丙烯酸树脂。

Functional Acrylic Resins Prepared via Photo-Induced Telomerization Using Tetrabromomethane as Telogen.

作者信息

Weisbrodt Mateusz, Kowalczyk Agnieszka, Schmidt Beata, Idzik Tomasz J, Sośnicki Jacek G

机构信息

Department of Chemical Organic Technology and Polymeric Materials, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, 70-322 Szczecin, Poland.

出版信息

Materials (Basel). 2023 Dec 14;16(24):7650. doi: 10.3390/ma16247650.

DOI:10.3390/ma16247650

PMID:38138792

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10744734/

Abstract

Novel method of obtaining functional acrylic resins (FARs) containing carboxyl- and benzophenone groups (in-chain functionalization) and terminal Br atoms was verified. Acrylic oligomers were prepared by a solution-free, UV-initiated telomerization process of basic monomer (n-butyl acrylate) and functional monomers (acrylic acid and 4-acrylooxybenzophenone) in the presence of radical photoinitiator and different amount of tetrabromomethane (CBr) as telogen. The effect of telogen content on UV-telomerization kinetics as well as physicochemical and thermal (T) properties of FARs was investigated. A telogen content higher than 5 wt. parts does not affect the UV-telomerization rate (photo-DSC), the molecular weights of telomers (GPC), or their glass transition temperature (DSC), but it significantly increases the conversion of monomers (up to 88%) and lowers the viscosity of FARs (approx. 6 Pa·s). NMR studies confirmed the inclusion of CBr in the structure of functional acrylic telomers.

摘要

验证了一种获得含有羧基和二苯甲酮基团（链内官能化）以及末端溴原子的功能性丙烯酸树脂（FAR）的新方法。在自由基光引发剂和不同量的四溴甲烷（CBr）作为调聚剂存在的情况下，通过碱性单体（丙烯酸正丁酯）和功能性单体（丙烯酸和4-丙烯酰氧基二苯甲酮）的无溶液紫外引发调聚过程制备丙烯酸低聚物。研究了调聚剂含量对紫外调聚动力学以及FAR的物理化学和热（T）性能的影响。调聚剂含量高于5重量份不会影响紫外调聚速率（光差示扫描量热法）、调聚物的分子量（凝胶渗透色谱法）或它们的玻璃化转变温度（差示扫描量热法），但它会显著提高单体的转化率（高达88%）并降低FAR的粘度（约6 Pa·s）。核磁共振研究证实了CBr包含在功能性丙烯酸调聚物的结构中。