Synthesis and characterization of linear waterborne poly(ethyl acrylate-urethane) prepared from poly(ethyl acrylate) diol via atom transfer radical polymerization

摘要

Linear waterborne poly(ethyl acrylate-urethane)s (PEA-Us) were synthesized by reacting a poly (ethyl acrylate) diol (HO-PEA-OH) with isophorone diisocyanate (IPDI) and 2,2-bis(hydroxymethyl) propionic acid (DMPA). The poly(ethyl acrylate) (HO-PEA-Br) was prepared by atom transfer radical polymerization of ethyl acrylate with a designed molecular weight (M _n) of about 2000 and the hydroxyl (OH) end capped poly(ethyl acrylate) (HO-PEA-OH) was obtained by substituting the bromo end group with N-ethanol methyl amine. The HO-PEA-OH of M _n 2000 with OH functionality of about 1.92 and the linear waterborne PEA-U with M _n of about 13,300 were obtained and characterized by hydrogen nuclear magnetic resonance (~1H-NMR), gel permeation chromatography, thermo gravimetric analysis, and differential scanning calorimetry. When the ratio of isocyanate to hydroxyl group (NCO/OH) was 1.4 and DMPA was 5 wt %, the waterborne PEA-U was a tough material with a tensile strength of 4.9 MPa, elastic modulus of 31.9 N/mm ~2 and elongation at break of about 286%, which showed its potential applications in many fields.