Photoinitiated Synthesis of Grafted Polymers

2006 ◽  
pp. 47-65 ◽  
Author(s):  
Daniel J. Dyer
Keyword(s):  
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.

Photoluminescent Grafted Polymers: Synthesis and Properties of a Polyethylene Matrix Covalently Linked with Porphyrin Units

2018 ◽  
Vol 219 (13) ◽  
pp. 1800041 ◽  
Author(s):  
Sandra M. Rojas-Montoya ◽  
Mireille Vonlanthen ◽  
Andrea Ruiu ◽  
Efraín Rodríguez-Alba ◽  
Guillermina Burillo ◽  
...  
Keyword(s):  
Grafted Polymers ◽  
Polyethylene Matrix ◽  
Covalently Linked

Grafted polymers from poly(4-vinylpyridinium) salts

Polymer ◽  
1975 ◽  
Vol 16 (2) ◽  
pp. 94-96 ◽  
Author(s):  
D Ghesquiere
Keyword(s):  
Grafted Polymers

Coil-Stretch Transitions for Grafted Polymers in Spatially Varying Flows

1995 ◽  
Vol 31 (7) ◽  
pp. 357-362 ◽  
Author(s):  
E. M Sevick ◽  
D. R. M Williams
Keyword(s):  
Grafted Polymers ◽  
Spatially Varying

Functionalization of liquid metal nanoparticles via the RAFT process

2021 ◽  
Author(s):  
Bo Fan ◽  
Jing Wan ◽  
Yiyi Liu ◽  
Wendy Wenjun Tian ◽  
San H. Thang
Keyword(s):  
Liquid Metal ◽  
Metal Nanoparticles ◽  
Grafted Polymers ◽  
Proper Design ◽  
Selection Of

The proper design and selection of RAFT agents allow the preparation of eutectic gallium–indium (EGaIn) based liquid metal nanoparticles with grafted polymers.

scholarly journals Hydrodynamic Shear Effects on Grafted and Non-Grafted Collapsed Polymers

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 926 ◽  
Author(s):  
Richard Schwarzl ◽  
Roland Netz
Keyword(s):  
Shear Rate ◽  
Brownian Dynamics ◽  
Tensile Force ◽  
Grafted Polymers ◽  
Critical Shear Rate ◽  
Rate Dependent ◽  
Coil Transition ◽  
Hydrodynamic Shear ◽  
Linear Shear ◽  
Dynamics Simulations

We study collapsed homo-polymeric molecules under linear shear flow conditions using hydrodynamic Brownian dynamics simulations. Tensile force profiles and the shear-rate-dependent globular-coil transition for grafted and non-grafted chains are investigated to shine light on the different unfolding mechanisms. The scaling of the critical shear rate, at which the globular-coil transition takes place, with the monomer number is inverse for the grafted and non-grafted scenarios. This implicates that for the grafted scenario, larger chains have a decreased critical shear rate, while for the non-grafted scenario higher shear rates are needed in order to unfold larger chains. Protrusions govern the unfolding transition of non-grafted polymers, while for grafted polymers, the maximal tension appears at the grafted end.

scholarly journals Study of The Reaction Mechanism to Produce Nanocellulose-Graft-Chitosan Polymer

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 883 ◽  
Author(s):  
Jose Sanchez-Salvador ◽  
Ana Balea ◽  
M. Monte ◽  
Angeles Blanco ◽  
Carlos Negro
Keyword(s):  
Reaction Mechanism ◽  
Acetic Acid Solution ◽  
Polymeric Materials ◽  
Grafted Polymers ◽  
Sem Images ◽  
Grafted Polymer ◽  
Cellulose Pulp ◽  
Key Factor ◽  
Molecular Weight Product ◽  
Mediated Oxidation

Cellulose and chitin are the most abundant polymeric materials in nature, capable of replacing conventional synthetic polymers. From them, cellulose nano/microfibers (CNFs/CMFs) and chitosan are obtained. Both polymers have been used separately in graft copolymerization but there are not many studies on the use of cellulose and chitosan together as copolymers and the reaction mechanism is unknown. In this work, the reaction mechanism to produce nano/microcellulose-graft-chitosan polymer has been studied. Recycled cellulose pulp was used, with and without a 2,2,6,6-tetramethylpiperidin-1-oxyl-radical (TEMPO)-mediated oxidation pretreatment, to produce CNFs and CMFs, respectively. For chitosan, a low-molecular weight product dissolved in an acetic acid solution was prepared. Grafted polymers were synthesized using a microwave digester. Results showed that TEMPO-mediated oxidation as the cellulose pretreatment is a key factor to obtain the grafted polymer CNF-g-CH. A reaction mechanism has been proposed where the amino group of chitosan attacks the carboxylic group of oxidized cellulose, since non-oxidized CMFs do not achieve the desired grafting. 13C NMR spectra, elemental analysis and SEM images validated the proposed mechanism. Finally, CNF-g-CH was used as a promising material to remove water-based inks and dyes from wastewater.

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