Well defined graft copolymers and end functional materials: synthesis, characterization and adhesion studies

This research focuses on the utilization of two living polymerization methods, anionic and group transfer, for the synthesis of well defined end functional materials and graft copolymers. Group transfer polymerization was utilized to synthesize acrylic terminal poly(methyl methacrylate) (PMMA) macromonomers of controlled molecular weight and narrow molecular weight distribution. A systematic series of PMMA macromonomers were copolymerized with 2-ethylhexyl acrylate to afford poly(2-ethylhexyl-g-methyl methacrylate) copolymers. These copolymers were synthesized in high yields with a high degree of incorporation of the PMMA macromonomer. These graft copolymers showed little or no phase mixing between the two components as evidenced by differential scanning calorimetry. It was determined by optimization studies that the reaction was complete within 50 hours at 65° C. Increases in initiator concentration surprisingly did not significantly effect homopolymerizations of 2-ethylhexyl acrylate with respect to molecular weight while the efficiency of incorporation of the macromonomer into the graft copolymers increased. End functional hydrogenated poly(butadiene) (HPBd) materials and HPBd-containing graft copolymers were synthesized using anionic polymerization methods. These materials were tested for their ability to act as adhesion promoters between poly(propylene)/EPDM and cycloaliphatic polyurethane coatings. Hydroxyl or carboxyl end functional materials were synthesized where molecular weight and chain microstructure were syStematically varied. Effective adhesion was achieved when the molecular weight of the polymer was approximately 20 kg/mol, the polymer was hydrogenated, contained 90 mole percent or greater 1,2- content in the poly(butadiene) precursor, and contained a functional end group, which may be either hydroxyl or carboxyl. To increase the concentration of functional groups over the above materials graft copolymers were utilized. Acrylic terminal HPBd macromonomers were synthesized and copolymerized with butyl acrylate in combination with either N,N-dimethylacrylamide (DMAA), 2-hydroxyethyl methacrylate (HEMA), methacrylic acid (MA), or t-butyl methacrylate (TBMA). Systematic compositions of these graft copolymers were synthesized and tested for adhesion. The acidic containing graft copolymers provided the most positive adhesion results. In one case the hydroxyl containing material also gave positive adhesion results. The DMAA containing materials failed in all cases. The TBMA route allowed for greater control over the composition of the acidic graft copolymers.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Chemistry

Department dc:contributor.department

Chemistry

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1993

Author dc:creator

• Sheridan, Matthew Stanley

Chair dc:contributor.committeechair

• McGrath, James E.

Committee members dc:contributor.committeemember

• Ward, Thomas C.
• Marand, Herve
• Kingston, David G. I.
• Riffle, Judy

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-12142006-131846

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/40414