Surface-Grafted Polymers from Electropolymerized Polythiophene RAFT Agent

2011 ◽  
Vol 44 (4) ◽  
pp. 966-975 ◽  
Author(s):  
Carlos D. Grande ◽  
Maria Celeste Tria ◽  
Guoqian Jiang ◽  
Ramakrishna Ponnapati ◽  
Rigoberto Advincula
Keyword(s):  
Grafted Polymers ◽  
Raft Agent ◽  
Surface Grafted Polymers

Expanding the Scope of Surface Grafted Polymers Using Electroinitiated Polymerization

Langmuir ◽  
2020 ◽  
Vol 36 (26) ◽  
pp. 7217-7226 ◽  
Author(s):  
James D. Randall ◽  
Melissa K. Stanfield ◽  
Daniel J. Eyckens ◽  
Jean Pinson ◽  
Luke C. Henderson
Keyword(s):  
Grafted Polymers ◽  
Electroinitiated Polymerization ◽  
Surface Grafted Polymers

scholarly journals Preparation of Homopolymer, Block Copolymer, and Patterned Brushes Bearing Thiophene and Acetylene Groups Using Microliter Volumes of Reaction Mixtures

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4458
Author(s):  
Joanna Smenda ◽  
Karol Wolski ◽  
Kamila Chajec ◽  
Szczepan Zapotoczny
Keyword(s):  
Block Copolymer ◽  
Polymer Brushes ◽  
Scaling Up ◽  
High Energy ◽  
Grafted Polymers ◽  
Metal Free ◽  
Micro Sensor ◽  
Patterned Films ◽  
Surface Grafted Polymers ◽  
Complex Polymer

The synthesis of surface-grafted polymers with variable functionality requires the careful selection of polymerization methods that also enable spatially controlled grafting, which is crucial for the fabrication of, e.g., nano (micro) sensor or nanoelectronic devices. The development of versatile, simple, economical, and eco-friendly synthetic strategies is important for scaling up the production of such polymer brushes. We have recently shown that poly (3-methylthienyl methacrylate) (PMTM) and poly (3-trimethylsilyl-2-propynyl methacrylate) (PTPM) brushes with pendant thiophene and acetylene groups, respectively, could be used for the production of ladder-like conjugated brushes that are potentially useful in the mentioned applications. However, the previously developed syntheses of such brushes required the use of high volumes of reagents, elevated temperature, or high energy UV-B light. Therefore, we present here visible light-promoted metal-free surface-initiated ATRP (metal-free SI-ATRP) that allows the economical synthesis of PMTM and PTPM brushes utilizing only microliter volumes of reaction mixtures. The versatility of this approach was shown by the formation of homopolymers but also the block copolymer conjugated brushes (PMTM and PTPM blocks in both sequences) and patterned films using TEM grids serving as photomasks. A simple reaction setup with only a monomer, solvent, commercially available organic photocatalyst, and initiator decorated substrate makes the synthesis of these complex polymer structures achievable for non-experts and ready for scaling up.

scholarly journals Light-promoted synthesis of surface-grafted polymers bearing pyridine groups by metal-free ATRP in microliter volumes

Polymer ◽  
2021 ◽  
Vol 234 ◽  
pp. 124244
Author(s):  
Monika Słowikowska ◽  
Artur J. Wójcik ◽  
Karol Wolski ◽  
Anna Hatalak ◽  
Szczepan Zapotoczny
Keyword(s):  
Grafted Polymers ◽  
Metal Free ◽  
Surface Grafted Polymers

scholarly journals Effect of Compatibility on the Foaming Behavior of Injection Molded Polypropylene and Polycarbonate Blend Parts

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 300 ◽  
Author(s):  
Bei Su ◽  
Ying-Guo Zhou ◽  
Bin-Bin Dong ◽  
Cao Yan
Keyword(s):  
Morphological Structure ◽  
Potential Method ◽  
Grafted Polymers ◽  
Dynamic Mechanical Analyzer ◽  
Blowing Agent ◽  
Cell Nucleation ◽  
Foaming Behavior ◽  
Thermal Features ◽  
Injection Molded ◽  
Scanning Electron

To improve the foaming behavior of a common linear polypropylene (PP) resin, polycarbonate (PC) was blended with PP, and three different grafted polymers were used as the compatibilizers. The solid and foamed samples of the PP/PC 3:1 blend with different compatibilizers were first fabricated by melt extrusion followed by injection molding (IM) with and without a blowing agent. The mechanical properties, thermal features, morphological structure, and relative rheological characterizations of these samples were studied using a tensile test, dynamic mechanical analyzer (DMA), scanning electron microscope (SEM), and torque rheometer. It can be found from the experimental results that the influence of the compatibility between the PP and PC phases on the foaming behavior of PP/PC blends is substantial. The results suggest that PC coupling with an appropriate compatibilizer is a potential method to improve the foamability of PP resin. The comprehensive effect of PC and a suitable compatibilizer on the foamability of PP can be attributed to two possible mechanisms, i.e., the partial compatibility between phases that facilitates cell nucleation and the improved gas-melt viscosity that helps to form a fine foaming structure.

Sign in / Sign up

Export Citation Format

Share Document