Synthesis of specifically functionalized polymers and their adsorption at the solid-solution interface

Miscellaneous · Fri Jan 01 00:00:00 EST 1993

OSTI ID:7274144

Kolb, B U

The synthesis and adsorption characteristics of specifically functionalized block copolymers have been investigated. Specifically functionalized polymers are block copolymers of controlled MW, MWD, block size and block placement, and meet the requirement that one of the blocks interacts strongly with a given surface whereas the other does not. Synthetic procedures involved living anionic polymerization of various monomers, allowing preparation of narrow-dispersity block copolymers of specific molecular weight, overall composition, block lengths and block placement. The location of the surface attachment could be controlled through appropriate block sequences. The grafting of polystyrene chains to the surface of poly(chlorotrifluorethylene) film was accomplished by reaction of the surface with three living polymer anions: polystyryl lithium, butadiene endcapped polystyryl lithium and ethylenesulfide endcapped polystyryl lithium. The effects of solvent, reaction temperature, reaction time and anion concentration of the grafted layer were studied by XPS, ATR-IR, gravimetrics and contact angle. The synthesis of styrene/propylenesulfide block copolymers was studied. Endcapping with ethyl bromide stabilized the polymers against disulfide formation and degradation of the polypropylenesulfide block. These polymers were adsorbed onto gold surfaces and analyzed by XPS, contact angle, and photomodulated external reflectance IR spectroscopy. This work discusses the synthesis of SF polymers with controlled placement of SF blocks at desired locations along the chain, focusing on the specific functionalization of the styrene blocks in styrene/tert-butyl styrene block copolymers. Reaction with DEOM/SnCl[sub 4] was very selective, controllable and allowed introduction of hydroxydiethyl malonate SF at various positions along the chain. The adsorption of these polymers to various silica surfaces was investigated.

• Research Organization: Massachusetts Univ., Amherst, MA (United States)
• OSTI ID: 7274144
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPOLYMERS
CHEMICAL PREPARATION
SORPTIVE PROPERTIES
GRAFT POLYMERS
ADSORPTION
LITHIUM COMPOUNDS
POLYSTYRENE
ALKALI METAL COMPOUNDS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SORPTION
SURFACE PROPERTIES
SYNTHESIS
SYNTHETIC MATERIALS
360601* - Other Materials- Preparation & Manufacture
400201 - Chemical & Physicochemical Properties