scholarly journals New classes of functionalized parylenes and poly(phenylene vinylene)s via coupling of dihaloxylyl diesters

2022 ◽  
Author(s):  
Jihong Lyu ◽  
Christopher W. Bielawski
Keyword(s):  
Phenylene Vinylene

New classes of poly(p-xylylene)s and poly(p-phenylene vinylene)s were synthesized and studied.

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

Functional Poly(p-Xylylene)s via Chemical Reduction of Poly(p-Phenylene Vinylene)s

2019 ◽  
Author(s):  
Ain Uddin ◽  
Weifan Sang ◽  
Yong Gao ◽  
Kyle Plunkett
Keyword(s):  
Film Formation ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Phenylene Vinylene ◽  
Polymer Modification ◽  
Polymer Backbone ◽  
Crosslinking Process ◽  
Conducting Membranes ◽  
In Situ Crosslinking

The synthesis of poly(p-xylylene)s (PPXs) with sidechains containing alkyl bromide functionality, and their post-polymer modification, is described. The PPXs were prepared by a diimide hydrogenation of poly(p-phenylene vinylene)s (PPVs) that were originally synthesized by a Gilch polymerization. The polymer backbone reduction was carried out with hydrazine hydrate in toluene at 80 °C to provide polymers with the sidechain-containing bromide functionality intact. To demonstrate post-polymer modification of the sidechains, the resulting PPX polymers were modified with trimethylamine to form tetraalkylammonium ion functionality and were evaluated as anion conducting membranes. While PPX homopolymers containing tetralkylammonium ions were completely water soluble and not able to form valuable films, PPX copolymers containing mixed tetraalkylammonium ions and hydrophobic chains were capable of film formation and alkaline stability. In addition, an in situ crosslinking process that used N,N,N',N'-tetramethyl-1,6-hexanediamine during the tetraalkylammonium formation of brominated PPX polymers was also evaluated and gave reasonable films with conductivities of ~10 mS-cm-1.

Stereoretentive Olefin Metathesis: A New Avenue for the Synthesis of All-cis Poly(p-phenylene vinylene)s and Stereo­defined Polyalkenamers

Synlett ◽  
2021 ◽  
Author(s):  
Quentin Michaudel ◽  
Samuel J. Kempel ◽  
Ting-Wei Hsu
Keyword(s):  
Olefin Metathesis ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Catalyst Design ◽  
Phenylene Vinylene ◽  
Grand Challenge ◽  
Ru Catalyst ◽  
Unique Reaction ◽  
Photochemical Isomerization ◽  
Optimized Conditions

AbstractOlefin metathesis has tremendously impacted all fields of synthetic chemistry. However, the control of the olefin stereochemistry during this process remains a grand challenge. Recent innovations in catalyst design have permitted control of the stereochemistry of the olefin product. Here, we discuss the development of stereoretentive olefin metathesis, with an emphasis on the synthesis of stereodefined polyalkenamers through ring-opening metathesis polymerization (ROMP). We then present our application of this unique reaction manifold to the preparation of all-cis poly(p-phenylene vinylene)s (PPVs). A dithiolate Ru catalyst was found to deliver perfect cis selectivity for the polymerization of a paracyclophane diene monomer. By using optimized conditions, all-cis PPVs with narrow dispersities and predictable molar masses were obtained by varying the ratio of monomer to catalyst. The high chain fidelity of the stereoretentive ROMP with a paracyclophane diene monomer enabled the preparation of well-defined diblock copolymers with a norbornene co-monomer. Photochemical isomerization of all-cis to all-trans PPVs was effected with both homopolymers and diblock copolymers. This process was shown to be selective for the PPV block, and resulted in changes in optical properties, polymer size, and solubility. Stereoretentive ROMP provides a promising platform for synthesizing polymers with unique properties, including photoresponsive all-cis PPVs with living characteristics.1 Introduction2 Synthetic Applications of Stereoretentive Olefin Metathesis3 Stereocontrol of Polyalkenamers through Stereoretentive ROMP4 Stereoretentive ROMP To Access All-cis Poly(p-phenylene vinylene)s5 Conclusion

Study of the Porous Silicon-Poly(p Phenylene-Vinylene) Systems

2000 ◽  
Vol 182 (1) ◽  
pp. 169-174
Author(s):  
Thien-Phap Nguyen ◽  
P. Joubert ◽  
P. Destruel ◽  
Ph. Le Rendu ◽  
M. Lak�hal
Keyword(s):  
Porous Silicon ◽  
Phenylene Vinylene

scholarly journals Self Assembled Phenylene Vinylene Materials

2002 ◽  
Vol 8 (S02) ◽  
pp. 318-319
Author(s):  
Martin U. Pralle ◽  
Gregory N. Tew ◽  
Mehmet Sayar ◽  
Leiming Li ◽  
Samuel I. Stupp
Keyword(s):  
Phenylene Vinylene ◽  
Self Assembled

Non-linear optical properties of poly(phenylene vinylene) in porous silicon substrates

2005 ◽  
Vol 2 (9) ◽  
pp. 3222-3226 ◽  
Author(s):  
T. P. Nguyen ◽  
P. Le Rendu ◽  
C. Simos ◽  
P. X. Nguyen ◽  
V. Skarka ◽  
...  
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Phenylene Vinylene ◽  
Silicon Substrates ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Linear Optical

scholarly journals Enhanced Emission Using Thin Li-Halide Cathodic Interlayers for Improved Injection into Poly(p-phenylene vinylene) Derivative PLEDs

2008 ◽  
Vol 11 (10) ◽  
pp. J76 ◽  
Author(s):  
Woo-Jun Yoon ◽  
Scott B. Orlove ◽  
Robert L. Olmon ◽  
Paul R. Berger
Keyword(s):  
Phenylene Vinylene

Using poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] as shell to fabricate the highly fluorescent nanofibers by coaxial electrospinning

Polymer ◽  
2007 ◽  
Vol 48 (15) ◽  
pp. 4311-4315 ◽  
Author(s):  
Qiang Zhao ◽  
Yi Xin ◽  
Zonghao Huang ◽  
Sidong Liu ◽  
Chunhe Yang ◽  
...  
Keyword(s):  
Phenylene Vinylene ◽  
Coaxial Electrospinning
Sign in / Sign up

Export Citation Format

Share Document