Synthesis of high molecular weight 3-arm star PMMA by ARGET ATRP

Abstract

High molecular weight (MW), 3-arm star poly(methyl methacrylate) (PMMA) with a narrow MW distribution (M n =570,000 g/mol, PDI=1.36) was successfully synthesized by activators regenerated by electron transfer (ARGET) atom transfer radical polymerization (ATRP). The polymerization was carried out with a trifunctional initiator/CuBr 2 /N,N,N',N'',N''-pentamethyldiethylenetriamine (PMDETA) initiator/catalyst system in the presence of a tin(II) 2-ethylhexanoate [Sn(EH) 2] reducing agent at 90 o C. The concentration of the copper catalyst was as low as 30 ppm, and a high initiation efficiency of the initiating sites was obtained. The chain-end functionality of the high MW, 3-arm star PMMA was confirmed by a chain extension experiment with styrene via ARGET ATRP, using the same catalyst system.

High Molecular Weight Poly(methyl methacrylate) Synthesis Using Recyclable and Reusable Zeolitic Imidazole Framework‐8 Catalyst

“…Hence to show the better catalytic performance and efficiency of the ZIF‐8, a comparison to the various catalysts mentioned earlier was made for HMW PMMA synthesis process ( Table 3 ). [ 18,21,30,41,61,64–66 ] A Relatively high MMA conversion is obtained using ( t Bu) 3 P base/Al(C 6 F 5 ) 3 pairs (Table 3; entry 5), t BuNHC base / Al(C 6 F 5 ) 3 pairs (Table 3; entry 6) and NHO base/(MeAl(BHT) 2 ) (Table 3; entry 7); however, in that case the molecular weight is found relatively low. Though the mentioned catalysts are very active, all of them require solvents which are not eco‐friendly and most of the catalysts are not recyclable except Cu 2 (bdc) 2 (DABCO).…”

“…Because of rapid acceleration in the rate and formation of a network polymer, bulk polymerization techniques are mostly used for the synthesis of HMWPs even at low conversion. [ 18–20 ] PMMA can be synthesized from the methyl methacrylate (MMA) by using the numerous kinds of metal complexes with the help of co‐catalyst in different solvents ( Figure ). [ 21–27 ] Recently, Zhang et al., [ 28 ] Nzahou Ottou et al., [ 29 ] and Bai et al.…”

Surface Modification of the UHMW-PMMA Film Processing by Solvent Molding

“…• After added Sulfonated-graphene into UHMW-PMMA, permeability become 127.850 cm 3 /m 2 •24h•0.1MPa and permeability coefficient permeability coefficient is 3.052×10 -11 cm 3 •cm/cm 2 •s•cm•Hg. Gas permeability has changed a lot and become too better than pure UHMW-PMMA film.…”

“…PMMA has been used widely as a dental material for the fabrication of complete denture bases [1] .While the molecular weight of poly methyl methacrylate being low, the poly methyl methacrylate shows poor chemical resistance and short high temperature [2] . With the developing of polymerization initiated by the plasma technology, we can get so-called Ultra high molecular weight PMMA which is a linear and solvent soluble polymer [3][4] .…”

Synthesis and characterization of star‐shaped PMMA using low‐ppm ARGET ATRP approach and changing to rigid powder for bone cement

“…Well-defined PMMAs (including star-shaped PMMAs) with Mn in the range from 1000 to 180000 Da [1] or higher (570000 Da) [26] and with low polydispersity have been synthesized by using ATRPs. Such defined molecular weight PMMA made by ATRP can meet some high-value applications, one of which might be the use as prepolymer for bone cement.…”