Abstract
Three functionalized second-order nonlinear optical polyimides were synthesized by the step growth polymerization reaction between a chromophore-containing dianhydride and three different diamine compounds. This alternate approach (i.e., incorporating a nonlinear chromophore into a dianhydride monomer) may avoid troublesome syntheses of the chromophore-containing diamine and can provide easy preparation of the polyimides with various chromophores. The number-average molecular weights (Mn) of final polymers determined by GPC ranged between 10 000 and 16 800 (Mw/Mn = 1.59-2.28). No melting was detected and they showed relatively low glass-transition temperatures ranging from 161 to 181 °C. They are readily soluble in aprotic polar solvents such as tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidinone, and so forth. High optical quality films were prepared by spin casting from a 10 wt % cyclohexanone or N-methylpyrrolidinone solution. The second harmonic generation (SHG) coefficients, d33, of the polymers were determined to be 24-37 pm/V (d33(∞) = 7-10 pm/V) at a fundamental wavelength of 1064 nm. All of the poled polymer samples showed outstanding orientational stability up to 125 °C without any measurable decay of the SHG signal. In particular, the polyimide with a 4,4′-(hexafluoroisopropylidene)dianiline unit (PI-2-DANS) showed the best dynamical thermal stability of the poling-induced dipole alignment up to ca. 170 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 218-226 |
| Number of pages | 9 |
| Journal | Chemistry of Materials |
| Volume | 11 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1999 Jan 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Chemistry
Cite this
An alternate synthetic approach for soluble nonlinear optical polyimides. / Woo, Han Young; Shim, Hong Ku; Lee, Kwang Sup; Jeong, Mi Yun; Lim, Tong Kun.
In: Chemistry of Materials, Vol. 11, No. 2, 01.01.1999, p. 218-226.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An alternate synthetic approach for soluble nonlinear optical polyimides
AU - Woo, Han Young
AU - Shim, Hong Ku
AU - Lee, Kwang Sup
AU - Jeong, Mi Yun
AU - Lim, Tong Kun
PY - 1999/1/1
Y1 - 1999/1/1
N2 - Three functionalized second-order nonlinear optical polyimides were synthesized by the step growth polymerization reaction between a chromophore-containing dianhydride and three different diamine compounds. This alternate approach (i.e., incorporating a nonlinear chromophore into a dianhydride monomer) may avoid troublesome syntheses of the chromophore-containing diamine and can provide easy preparation of the polyimides with various chromophores. The number-average molecular weights (Mn) of final polymers determined by GPC ranged between 10 000 and 16 800 (Mw/Mn = 1.59-2.28). No melting was detected and they showed relatively low glass-transition temperatures ranging from 161 to 181 °C. They are readily soluble in aprotic polar solvents such as tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidinone, and so forth. High optical quality films were prepared by spin casting from a 10 wt % cyclohexanone or N-methylpyrrolidinone solution. The second harmonic generation (SHG) coefficients, d33, of the polymers were determined to be 24-37 pm/V (d33(∞) = 7-10 pm/V) at a fundamental wavelength of 1064 nm. All of the poled polymer samples showed outstanding orientational stability up to 125 °C without any measurable decay of the SHG signal. In particular, the polyimide with a 4,4′-(hexafluoroisopropylidene)dianiline unit (PI-2-DANS) showed the best dynamical thermal stability of the poling-induced dipole alignment up to ca. 170 °C.
AB - Three functionalized second-order nonlinear optical polyimides were synthesized by the step growth polymerization reaction between a chromophore-containing dianhydride and three different diamine compounds. This alternate approach (i.e., incorporating a nonlinear chromophore into a dianhydride monomer) may avoid troublesome syntheses of the chromophore-containing diamine and can provide easy preparation of the polyimides with various chromophores. The number-average molecular weights (Mn) of final polymers determined by GPC ranged between 10 000 and 16 800 (Mw/Mn = 1.59-2.28). No melting was detected and they showed relatively low glass-transition temperatures ranging from 161 to 181 °C. They are readily soluble in aprotic polar solvents such as tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidinone, and so forth. High optical quality films were prepared by spin casting from a 10 wt % cyclohexanone or N-methylpyrrolidinone solution. The second harmonic generation (SHG) coefficients, d33, of the polymers were determined to be 24-37 pm/V (d33(∞) = 7-10 pm/V) at a fundamental wavelength of 1064 nm. All of the poled polymer samples showed outstanding orientational stability up to 125 °C without any measurable decay of the SHG signal. In particular, the polyimide with a 4,4′-(hexafluoroisopropylidene)dianiline unit (PI-2-DANS) showed the best dynamical thermal stability of the poling-induced dipole alignment up to ca. 170 °C.
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U2 - 10.1021/cm980307l
DO - 10.1021/cm980307l
M3 - Article
AN - SCOPUS:0000395175
VL - 11
SP - 218
EP - 226
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 2
ER -