High solid content CO2-based cationic waterborne polyurethanes(CWPUs)were prepared using CO2-polyols as soft segment and N-methyl diethanolamine(MDEA)as hydrophilic group.The resulting stable aqueous dispersion displayed a high solid content of 52％with a low MDEA loading of 3.52 wt％.This novel structural CWPU can provide excellent adhesive strength,whose T-peel strength could reach 173.48 N/5cm,20％higher than that of ester-based cationic waterborne polyurethane(87.55 N/5cm).The CO2-based CWPU film showed only 2 wt％swelling percentage after 240 min immersion in water,and no change was observed during its immersion in 5 wt％sodium hydroxide solution.The tensile strength of CO2-WPUs dropped slowly to 91.2％after 480 min immersion in a 5 wt％sodium hydroxide solution,whereas that of ester-based CWPUs dropped quickly to 32％after 240 min and their mechanical properties were lost after 360 min immersion.Meanwhile,the retention of the tensile strength of the CO2-CWPUs was 81.5％even after 720 min immersion in 10 wt％H2O2 solution,while it was only ca.38％for the ester-based CWPUs.These results indicated that the cationic CO2-based CWPU may be promising waterborne adhesive with outstanding ageing resistance due to its synergistic effect from carbonate and ether groups of CO2-polyol structure.

Hong-Ming Zhang;Guang-Ping Han;Wan-Li Cheng;Shun-Jie Liu;Xian-Hong Wang

Key Laboratory of Bio-based Material Science and Technology(Ministry of Education),Northeast Forestry University,Harbin 150040,China;Key Laboratory of Polymer Ecomaterial,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

高分子科学（英文版）

[1]Hong-Ming Zhang;Guang-Ping Han;Wan-Li Cheng;Shun-Jie Liu;Xian-Hong Wang-.Cationic CO2-based Waterborne Polyurethane with High Solid Content and Excellent Ageing Resistance)[J].高分子科学（英文版）,2022(10):1183-1192

Waterborne,CWPUs,diethanolamine,WPUs

Cationic,Polyurethane,High,Solid,Content,Excellent,Ageing,Resistance,solid,content,cationic,waterborne,polyurethanes,were,prepared,using,polyols,soft,segment,methyl,MDEA,hydrophilic,resulting,stable,aqueous,dispersion,displayed,loading,wt,This,novel,structural,can,provide,excellent,adhesive,strength,whose,peel,could,reach,5cm,higher,that,ester,film,showed,only,swelling,percentage,after,immersion,change,was,observed,during,its,sodium,hydroxide,solution,tensile,dropped,slowly,whereas,quickly,their,mechanical,properties,lost,Meanwhile,retention,even,H2O2,These,results,indicated,may,be,promising,outstanding,ageing,resistance,due,synergistic,effect,from,carbonate,ether,groups,structure

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