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  • Preparation and characterization of poly(acrylic acid)-hydroxyethyl cellulose graft copolymer.

Preparation and characterization of poly(acrylic acid)-hydroxyethyl cellulose graft copolymer.

Carbohydrate polymers (2012-07-31)
E S Abdel-Halim
ABSTRACT

Poly(acrylic acid) hydroxyethyl cellulose [poly(AA)-HEC] graft copolymer was prepared by polymerizing acrylic acid (AA) with hydroxyethyl cellulose (HEC) using potassium bromate/thiourea dioxide (KBrO(3)/TUD) as redox initiation system. The polymerization reaction was carried out under a variety of conditions including concentrations of AA, KBrO(3) and TUD, material to liquor ratio and polymerization temperature. The polymerization reaction was monitored by withdrawing samples from the reaction medium and measuring the total conversion. The rheological properties of the poly(AA)-HEC graft copolymer were investigated. The total conversion and rheological properties of the graft copolymer depended on the ratio of KBrO(3) to TUD and on acrylic acid concentration as well as temperature and material to liquor ratio. Optimum conditions of the graft copolymer preparation were 30 mmol KBrO(3) and 30 mmol TUD/100g HEC, 100% AA (based on weight of HEC), duration 2h at temperature 50 °C using a material to liquor ratio of 1:10.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hydroxyethyl-cellulose
Sigma-Aldrich
Hydroxyethyl-cellulose, viscosity 90-160 cP, 5 % in H2O(25 °C)
Sigma-Aldrich
2-Hydroxyethyl cellulose, average Mv ~90,000
Sigma-Aldrich
2-Hydroxyethyl cellulose, average Mv ~720,000
Sigma-Aldrich
2-Hydroxyethyl cellulose, average Mw ~380,000
Sigma-Aldrich
2-Hydroxyethyl cellulose, average Mv ~1,300,000
Sigma-Aldrich
Potassium bromate, puriss. p.a., ACS reagent, ≥99.8% (dried material, RT)
Sigma-Aldrich
Potassium bromate, ACS reagent, ≥99.8%