Toward a non-invasive cleaning of the wall painting using polyelectrolyte hydrogel  

作　　者：LI Qiang WU Chao PENG YaJun ZHANG BingJian 

机构地区：[1]School of Art and Archaeology,Zhejiang University,Hangzhou 310028,China [2]Zhejiang University Press,Hangzhou 310028,China [3]Zhejiang Museum of Natural History,Hangzhou 310000,China [4]Department of Chemistry,Zhejiang University,Hangzhou 310027,China

出　　处：《Science China(Technological Sciences)》2023年第8期2213-2224,共12页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.31900104);the Conservation Science and Technology Project of Zhejiang Provincial Administration of Cultural Heritage(Grant No.2023011);the Fundamental Research Funds for the Central Universities(Grant Nos.S20220161,S20220105)。

摘　　要：Developing advanced cleaning systems for the removal of unwanted layers from painted surfaces is still a challenging issue that needs to be addressed in the field of cultural heritage.In this work,we proposed the use of novel polyelectrolyte hydrogels prepared via free radical polymerization and freeze-thaw methods.Zwitterionic sulfobetaine methacrylate(SBMA)was crosslinked with methylacryloyloxyethyl trimethylammonium(DMC)through covalent bonding to yield zwitterionic polyelectrolyte poly(SBMA-co-DMC)(PSD).Introducing PSD into the polyvinyl alcohol/carboxymethyl chitosan(PVA/CMC)hydrogel network enhanced the intermolecular electrostatic interactions and changed the porous structure and swelling behaviors,thus leading to improved mechanical properties.The adsorption ability of the PVA/CMC/PSD polyelectrolyte hydrogels toward dyes(rhodamine B and congo red)and metal ions(Cu^(2+)and K^(+))varied with increasing amounts of PSD,which could be attributed to cationic PSD tuning the net charges in the hydrogel.The cleaning effectiveness of the PVA/CMC/PSD polyelectrolyte hydrogels was assessed on wall painting mock-ups coated with soil,red paint,and soluble salts,using microscopic and spectroscopic analyses.The results showed that the hydrogel adhered to rough surfaces and removed unwanted substances effectively without leaving determinable residues,providing a possible safe and efficient method for the cleaning of important artifacts.

关 键 词：polyelectrolyte hydrogel SBMA adsorption cleaning effectiveness 

分 类 号：K879.41[历史地理—考古学及博物馆学] TQ427.26[历史地理—历史学]