New approaches to polymeric nonlinear optical materials
Thin film single crystal growth of the third order NLO polydiacetylenes are reported. The monomer crystals were grown from the solution confined between two optically flat plates, followed by topochemical polymerization by UV radiation and heat. It was found that polymer crystals obtained from this technique were two-dimensional single crystals with significantly reduced defects. Extensive studies on easily processable photocrosslinking [open quotes]guest-host[close quotes] systems, carried out for second order NLO applications are presented. In these systems, carried out for second order NLO applications are presented. In these systems, photocrosslinking cinnamate types of polymers and azobenzene NLO chromophores were involved as polymer host and NLO guest, respectively. It was found that the systems exhibited stable second order NLO coefficients with time at room temperature, while showing rapid decay of the coefficients at an elevated temperature (100[degrees]C). In Chapter 4, a highly doped guest-host system was studied and the relationships of thermal transition behaviors and linear and nonlinear optical properties were measured as a function of doping concentration. In that system both polymer host and NLO guest carry the same photoreactive groups, which is expected to result in enhanced miscibility. It was observed that the system did not show any observable phase segregation up to 67 weight percent of doping level to which experiments were carried out. The electro-optic coefficient at high doping concentration was quite large in comparison to other organic and inorganic systems. In Chapter 5, polymerization of the azobenzene NLO chromophore carrying two cinnamoyl groups were studied by photo and thermal inductions to obtain significantly large number density of the chromophore by solid state reaction. Photoinduced polymerization did not take place, while thermal polymerization resulted in amorphous oligomers with superior processability into thin films.
- Research Organization:
- Massachusetts Univ., Lowell, MA (United States)
- OSTI ID:
- 5606217
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC POLYMERS
CHEMICAL PREPARATION
OPTICAL PROPERTIES
CRYSTAL DEFECTS
CRYSTAL DOPING
CRYSTAL GROWTH
CRYSTALS
NONLINEAR OPTICS
PHOTOCHEMICAL REACTIONS
POLARIZATION
POLYMERIZATION
THIN FILMS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
FILMS
OPTICS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
SYNTHESIS
360601* - Other Materials- Preparation & Manufacture
360606 - Other Materials- Physical Properties- (1992-)