Polymer-encased vesicles derived from dioctadecyldimethylammonium methacrylate

Journal Article · Wed Apr 30 04:00:00 EDT 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00269a030· OSTI ID:5532691

Fukuda, H; Diem, T; Stefely, J; Kezdy, F J; Regen, S L

Dispersal of dioctadecyldimethylammonium methacrylate (DODAM) in water via ultrasonic irradiation yielded small-diameter vesicles having a phase transition at ca. 42-46/sup 0/C. Photopolymerization (254 nm) at 30 and 60/sup 0/C resulted in the formation of polymer-encased vesicles which retained phase-transition behavior. Combination of dynamic light scattering, electron microscopy, and captured volume data provides strong evidence for vesicle shrinkage when polymerization is carried out at 60/sup 0/C; shrinkage occurring during photopolymerization at 30/sup 0/C is less certain. Poly(methacrylic acid), derived from 30/sup 0/-polymerized vesicles (30/sup 0/-polymerized means polymerized at 30/sup 0/C in this paper), was 75.4% syndiotactic, 22.3% heterotactic, and 2.3% isotactic and was significantly more soluble in DMF than poly(methacrylic acid) derived from 60/sup 0/-polymerized vesicles; the latter polymer was predominantly syndiotactic. At 25/sup 0/C, nonpolymerized, 30/sup 0/-polymerized, and 60/sup 0/-polymerized vesicles showed similar permeability toward sucrose; at 60/sub 0/C, the 60/sup 0/-polymerized vesicles were less permeable. Storage of the 60/sup 0/-polymerized and the nonpolymerized DODAM vesicles for 2 months at room temperature revealed the former to be more stable. The monolayer properties and photopolymerization behavior of DODAM have been investigated at the air-water interface.

• Research Organization: Lehigh Univ., Bethlehem, PA
• DOE Contract Number: AC02-77ER04446
• OSTI ID: 5532691
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:9; ISSN JACSA
• Country of Publication: United States
• Language: English

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ACRYLATES
AMMONIUM COMPOUNDS
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
MEDIUM TEMPERATURE
MICROSCOPY
NUMERICAL DATA
PHASE TRANSFORMATIONS
PHOTOCHEMICAL REACTIONS
POLYMERIZATION
POLYMERS
SHRINKAGE
STABILITY
SURFACE PROPERTIES