Effects of reaction conditions on poly(methyl methacrylate) polymerized by living radical polymerization with iniferter

Abstract

Living radical polymerization of methyl methacrylate (MMA) through the use of benzyl diethyl dithiocarbamate (BDC) was studied. The aim was to investigate the role of the concentration, BDC-to-MMA mol ratio, and reaction time upon the molecular weight, polydispersity, and conversion of the product. It was found that the molecular weight and the conversion increase with increase of the concentration at the expense of low polydispersity. The reaction time also played a significant role, especially at a relatively long reaction time where molecular weight, polydispersity, and conversion increased with increasing reaction time. In terms of the mol ratio effect, it was found that there was a critical mol ratio for maximum conversion. The results indicate that the kinetics of polymerization of MMA through the use of a BDC inifeter is different from that in the presence of a conventional initiator.

Expandable styrene/methyl methacrylate copolymer: Synthesis and determination of VOCs by combined thermogravimetry/differential thermal analysis‐gas chromatography/mass spectrometry

“…The peaks at 7.1 and 3.6 ppm, corresponding to C 6 H 5 and OCH 3 , can be observed. The peak at 2.8 ppm, absent in the 1 H‐NMR spectra of both relevant homopolymers,48, 49 can be observed in the copolymer spectrum. This has been assigned to the OCH 3 group of polymethyl metacrylate (PMMA) bonded to the PS segment 50.…”

The non-isothermal degradation kinetics of St–MMA copolymers

“…The peaks at 7.1 and 3.6 ppm correspond to eC 6 H 5 and eOCH 3 groups, respectively. The peak at 2.8 ppm, absent in the 1 H NMR spectra of both relevant homopolymers [17] was observed in the copolymers spectrum. This has been assigned to the eOCH 3 group of MMA bonded to styrene sequence [18].…”

Determination of activation energy during the thermal degradation of Polyamide 66/glass fiber composites

“…where E is the activation energy (J mol −1 ), A is the pre-exponential factor (s −1 ), and R is the gas constant (8.314 J mol −1 K −1 ). The kinetics analysis of non-isothermal data is generally performed by the following equation 14…”

“…Isoconversional methods are reliable techniques which determine the activation energy at fixed conversions. 10 –16 Flynn–Wall–Ozawa method is an isoconversional method in which the activation energy is estimated without the knowledge of reaction model. The result of the integration is…”

“…10 –13 In this work, PA 66 samples were compounded with glass fibers (GF) by an internal mixer to produce PA 66/GF composites. Following that, the activation energies of composites have been calculated using Flynn–Ozawa–Wall 14 –16 method. Furthermore, the isokinetic relationship (IKR) 9 was used to estimate a model-independent pre-exponential factor for each degree of conversion.…”