End groups of poly(methyl methacrylate-co-styrene) prepared with tert-butoxy, methyl, and/or phenyl radical initiation: effects of solvent, monomer composition, and conversion

1988 ◽  
Vol 21 (5) ◽  
pp. 1522-1528 ◽  
Author(s):  
Debra Bednarek ◽  
Graeme Moad ◽  
Ezio Rizzardo ◽  
David H. Solomon
Keyword(s):  
Methyl Methacrylate ◽  
Phenyl Radical ◽  
Radical Initiation ◽  
Poly Methyl Methacrylate ◽  
Monomer Composition ◽  
End Groups

scholarly journals Introduction of Stilbene Derivatives and Cinnamate Ester Derivatives at the ω-End Groups of Poly(Methyl Methacrylate) Prepared via RAFT Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2449
Author(s):  
Martyn Dobinson ◽  
Philip Hodge ◽  
Trevor Wear
Keyword(s):  
Nmr Spectroscopy ◽  
Methyl Methacrylate ◽  
Raft Polymerization ◽  
19F Nmr ◽  
19F Nmr Spectroscopy ◽  
Poly Methyl Methacrylate ◽  
End Groups ◽  
Stilbene Derivatives

The capping of “living” poly(methyl methacrylate) (PMMA) and “living” polystyrene (PS), both prepared by the RAFT technique, with various olefins was screened using 19F-NMR spectroscopy. The capping of “living” PMMA with a labeled stilbene was as high as 63% and with certain cinnamate esters was essentially quantitative, but the capping of “living” polystyrene with all the olefins investigated was generally poor.

scholarly journals Synthesis and post-polymerization reaction of end-clickable stereoregular polymethacrylates via termination of stereospecific living anionic polymerization

2015 ◽  
Vol 6 (7) ◽  
pp. 1078-1087 ◽  
Author(s):  
Yasuhiro Kohsaka ◽  
Takashi Kurata ◽  
Kazuki Yamamoto ◽  
Shoya Ishihara ◽  
Tatsuki Kitayama
Keyword(s):  
Methyl Methacrylate ◽  
Anionic Polymerization ◽  
Polymerization Reaction ◽  
Living Anionic Polymerization ◽  
Poly Methyl Methacrylate ◽  
End Groups

Poly(methyl methacrylate)s with high stereoregularity and clickable end-groups were synthesized via terminating reactions with α-(halomethyl)acrylates in stereospecific living anionic polymerization.

Effect of poly (methyl methacrylate)-grafted-talc content on mechanical properties and thermal degradation of poly (vinyl chloride) composites

2012 ◽  
Vol 32 (4-5) ◽  
pp. 275-282 ◽  
Author(s):  
Azman Hassan ◽  
Noor Izyan Syazana Mohd Yusoff ◽  
Aznizam Abu Bakar
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Vinyl Chloride ◽  
Flexural Modulus ◽  
Nitrogen Atmosphere ◽  
Radical Initiation ◽  
Poly Methyl Methacrylate ◽  
Poly Vinyl Chloride ◽  
Free Radical Initiation ◽  
The Impact

Abstract The influence of talc and poly (methyl methacrylate) (PMMA)-grafted (g)-talc on the mechanical properties of poly (vinyl chloride) (PVC) was investigated. The graft copolymerization was carried out under nitrogen atmosphere, using the free radical initiation technique. The blend formulations were first dry blended using a mixer before being milled into sheets on a two-roll mill at 165°C, and then hot pressed into composites at 190°C. The flexural modulus of both composites increased with increasing filler content from 0 to 20 part per hundred resin (phr), however the increment of grafted (57.7%) was higher than ungrafted composites (48.5%). A similar trend has also been observed for thermal stability. The impact strength of grafted was increased by 45.82%, whereas 18.96% in reduction was observed for the ungrafted composites. The decrement of flexural strength by 16.6% and 21.1% of grafted and ungrafted, respectively, has also shown the improvement in mechanical properties of grafted composites.

Characterization of Branched Alkyl End Groups of Poly(methyl methacrylate) by Pyrolysis−Gas Chromatography

1996 ◽  
Vol 29 (13) ◽  
pp. 4516-4519 ◽  
Author(s):  
Yoshiro Ito ◽  
Shin Tsuge ◽  
Hajime Ohtani ◽  
Shigeo Wakabayashi ◽  
Jun-ichiro Atarashi ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Methyl Methacrylate ◽  
Pyrolysis Gas ◽  
Poly Methyl Methacrylate ◽  
Pyrolysis Gas Chromatography ◽  
End Groups

A Potential New RAFT - Click Reaction or a Cautionary Note on the Use of Diazomethane to Methylate RAFT-synthesized Polymers

2011 ◽  
Vol 64 (4) ◽  
pp. 433 ◽  
Author(s):  
Ming Chen ◽  
Graeme Moad ◽  
Ezio Rizzardo
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Room Temperature ◽  
Click Reaction ◽  
Raft Polymerization ◽  
Dipolar Cycloaddition ◽  
Low Molecular Weight ◽  
Similar Reaction ◽  
Poly Methyl Methacrylate ◽  
End Groups

It has been found that diazomethane undergoes a facile 1,3‐dipolar cycloaddition with both dithiobenzoate RAFT agents and the dithiobenzoate end‐groups of polymers formed by RAFT polymerization. Thus, 2‐cyanoprop‐2‐yl dithiobenzoate on treatment with diazomethane at room temperature provided a mixture of stereoisomeric 1,3‐dithiolanes in near quantitative (>95%) yield. A low‐molecular‐weight RAFT‐synthesized poly(methyl methacrylate) with dithiobenzoate end‐groups underwent similar reaction as indicated by immediate decolourization and a quantitative doubling of molecular weight. Higher‐molecular‐weight poly(methyl methacrylate)s were also rapidly decolourized by diazomethane and provided a product with a bimodal molecular weight distribution. Under similar conditions, the trithiocarbonate group does not react with diazomethane.

End-groups in poly(methyl methacrylate) prepared using aroyl peroxides in the presence of 4-hydroxystilbene

1993 ◽  
Vol 29 (4) ◽  
pp. 513-515 ◽  
Author(s):  
C.A. Barson ◽  
J.C. Bevington ◽  
T.N. Huckerby ◽  
B.J. Hunt
Keyword(s):  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
End Groups
Sign in / Sign up

Export Citation Format

Share Document