Study on preparation and performance of water reducer based on methyl allyl polyoxyethylene ether modified by caprolactone
ZHANG Zhiyong
HUANG Zhen
YANG Yong
ZHANG Jiangang
RAN Qianping
Abstract：This work employed the ring-opening polymerization reaction of ε-caprolactone for end-modification of methyl allyl polyoxyethylene ether (MAPEG) in the presence of stannous octoate as catalyst. The influence of reaction conditions such as catalyst and pH value on the ring-opening reaction was studied. The terminal-modified MAPEG was then copolymerized with acrylic acid(AA) to produce hydrophobically modified polycarboxylate-based superlasticizers(PCEs). Effects of the number of caprolactone and molecular weight on the dispersing and dispersion maintenance abilities of PCEs were studied. Particular focus was also placed on the difference between the hydrophobically modified and the ordinary PCEs in their air-entraining and foam stabilization abilities. The results showed that the number of added caprolactones played an important role in the dispersing ability of the hy-drophobically modified PCEs. The more the number of added caprolactones,the more obvious the decrease in dispersing ability,but the air entraining and foam stabilization abilities were more enhanced. When 3 caprolactones were added,the water reducing performance decreased only slightly,but the state of the concrete was notably improved.
Keywords：ε-caprolactonemethyl allyl polyoxyethylene etherpolycarboxylate water reducer
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 60-63 )