Title: Optimization of the Structural Parameters and Properties of PCE Based on the Length of Grafted Side Chain

Author(s): Zi-Ming Wang, Zi-Chen Lu, and Xiao Liu

Publication: Symposium Paper

Volume: 302

Issue:

Appears on pages(s): 265-278

Keywords: PCE; IPEG; backbone; side chain; structural parameters

DOI: 10.14359/51688100

Date: 6/1/2015

Abstract:
A series of polycarboxylic ether (PCE) superplasticizers were copolymerized through acrylic acid (AA) and isobutylene polyethylene glycol (IPEG) with different molecular weight (500, 1000, 1500, 2000, 2400 and 2700). The molecular weight, molecular weight distribution and reaction ratio were measured by gel permeation chromatography (GPC). The initial fluidity and flow retaining ability were evaluated through mini slump test at the same dosage (by mole and by weight). The results indicated that the dispersing capability of single PCE molecule firstly improved with the increase of backbone length, and then decreased after reaching a critical value. Both the appropriate backbone length and side chain density of PCE were affected significantly by the side chain length. In general, PCE with longer side chain, shorter backbone length and lower side chain density are appropriate to achieve better comprehensive properties. Finally, regression equations were proposed to predict the suitable backbone length and proper side chain density of PCE based on the length of grafted side chain.