TOWARDS THERMALLY STABLE, HIGHLY ELECTRO-OPTICALLY ACTIVE ORGANIC POLYMERS: DESIGN AND SYNTHESIS OF CROSSLINKABLE POLYIMIDES CONTAINING ZWITTERIONIC NONLINEAR OPTICAL CHROMOPHORES

2005 ◽  
Vol 14 (03) ◽  
pp. 367-374 ◽  
Author(s):  
NAIHENG SONG ◽  
LIQIU MEN ◽  
JIAN PING GAO ◽  
GUOMIN YU ◽  
ANDREW M. R. BEAUDIN ◽  
...  
Keyword(s):  
Glass Transition ◽  
Nonlinear Optical ◽  
Strong Dependence ◽  
Temporal Stability ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Design And Synthesis ◽  
Chain Mobility ◽  
Electro Optic ◽  
Nonlinear Optical Chromophores

A series of nonlinear optical (NLO) polymers were synthesized by grafting a zwitterionic chromophore onto host acid-containing polyimides with different glass transition temperatures and chain mobility. All the NLO polymers showed good solubility, thermal stability and good film-forming ability. The poling and electro-optic (EO) studies revealed a strong dependence of EO coefficients on the polymer chain mobility or the glass transition temperatures. A new thermally crosslinkable group was introduced into the NLO polymers, in order to achieve high temporal stability of the poled NLO polymers.

New main chain nonlinear optical polymers with high glass transition temperatures

1992 ◽  
Vol 28 (4) ◽  
pp. 381-388 ◽  
Author(s):  
Michael A. Mitchell ◽  
James E. Mulvaney ◽  
H. K. Hall ◽  
Craig S. Willand ◽  
Hillary Hampsch ◽  
...  
Keyword(s):  
Glass Transition ◽  
Nonlinear Optical ◽  
Main Chain ◽  
Transition Temperatures ◽  
Optical Polymers ◽  
Glass Transition Temperatures ◽  
Nonlinear Optical Polymers

scholarly journals The design and synthesis of nonlinear optical chromophores containing two short chromophores for an enhanced electro-optic activity

2021 ◽  
Author(s):  
Fenggang Liu ◽  
Gangzhi Qin ◽  
Ziheng Li ◽  
Ziwei Wang ◽  
Meishan Peng ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Design And Synthesis ◽  
Electro Optic ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

A series of nonlinear optical chromophores A–D based on the diethylaminophenyl donor and tricyanofuran or phenyl-trifluoromethyl-tricyanofuran acceptors coupled through a tetraene bridge was synthesized and investigated.

Crystallization kinetics and miscibility of blends of polyhydroxybutyrate (PHB) with ethylene vinyl acetate copolymers (EVA)

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
S. H. El-Taweel ◽  
B. Stoll ◽  
C. Schick
Keyword(s):  
Glass Transition ◽  
Vinyl Acetate ◽  
Isothermal Crystallization ◽  
Strong Dependence ◽  
Chloroform Solution ◽  
Ethylene Vinyl Acetate ◽  
Transition Temperatures ◽  
Half Time ◽  
Segmental Mobility ◽  
Glass Transition Temperatures

AbstractA series of ethylene vinyl acetate random copolymer EVA, with vinyl acetate (VA) varied from 9 to 91m%, was investigated by differential scanning calorimetry DSC and polarized optical microscopy. Biodegradable polymer blends of polyhydroxybutyrate PHB and EVA, having VA in EVA in range from 40m% till 91m%, were prepared by film casting from a chloroform solution. The miscibility and crystallization behavior of these blends were investigated. The isothermal crystallization behaviors of PHB and PHB/EVA blends are discussed in terms of the half time of crystallization t1/2. Experimental results indicated that blends of PHB/ EVA91 are completely miscible blend in the entire (0 to 100 m%) compositional ranges. Blends PHB/ EVA, for VA varied from 40 till 70 m% are immiscible as evidenced by the existence of unchanged composition independent glass transition temperatures (Tg), crystallization and melting behavior. The isothermal crystallization of PHB blends was investigated from room temperature till 130 °C. 80 °C was found to be the best temperature for comparison of different blends. At 80 °C t1/2 strongly depends on the content of VA in PHB/EVA blend, mainly due to differences in miscibility as well as due to differences in segmental mobility as identified by differences in glass transition temperature. Since both components in PHB/EVA80, pure PHB and pure EVA80, have glass transition temperatures close to 0 °C, it is difficult to decide its miscibility from Tg. However from the strong dependence of the value of crystallization half time t1/2 of PHB/EVA80 on blend composition, it was possible to reasonably infer that PHB/EVA80 is partially miscible.

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