W. Wu et al., Thermally stable second-order nonlinear optical addition-type polyimides functionalized by diamine chromophore, J POL SC PC, 37(18), 1999, pp. 3598-3605
Citations number
25
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
A series of chromophore-functionalized polyimide prepolymers with excellent
processibility were prepared by a Michael addition reaction of diamine chr
omophore 2 with structurally different bismaleimide (BMI) monomers. The eff
ects of the BMI moiety's structure and thermal curing condition on glass tr
ansition temperature (T-g) and thermal stability of the polyimides were stu
died by DSC, TCA, and FTIR. Among the five cured polyimides, PI3, bearing a
sulfone moiety, exhibited the highest T-g and thermal decomposition temper
ature (T-d). Its corresponding prepolymer, PP3, was selected to evaluate NL
O properties in a simultaneously poling and thermal polymerization process.
A relatively large poling-order parameter was observed. The second-order n
onlincar coefficient, d(33), was 25 pmN at 1061 nm fundamental wavelength.
The second harmonic generation signal was almost without decay up to 170 de
grees C. (C) 1999 John Wiley & Sons, Inc.