AFM Study of Tethered Polystyrene-b-poly(methyl methacrylate) and Polystyrene-b-poly(methyl acrylate) Brushes on Flat Silicate Substrates

2000 ◽  
Vol 33 (23) ◽  
pp. 8821-8827 ◽  
Author(s):  
Bin Zhao ◽  
William J. Brittain ◽  
Wensheng Zhou ◽  
Stephen Z. D. Cheng
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Poly Methyl Methacrylate

Two-dimensional NMR studies of acrylate copolymers

2009 ◽  
Vol 81 (3) ◽  
pp. 389-415 ◽  
Author(s):  
A. S. Brar ◽  
Ashok Kumar Goyal ◽  
Sunita Hooda
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Quantum Coherence ◽  
Multiple Bond ◽  
Microstructural Analysis ◽  
2D Nmr ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Poly Methyl Methacrylate ◽  
Nmr Study

High-resolution NMR spectroscopy is the most versatile, reliable, and generally acceptable technique for the determination of the microstructure of polymers. 2D NMR techniques, along with 1D NMR, have more potential to study absolute configurational assignments and sequence distribution of copolymers. Physical and chemical properties of polymers are influenced fundamentally by their microstructure. We discuss the detailed microstructure analysis of a large number of homopolymers, copolymers, and terpolymers. 2D NMR study of poly(methyl methacrylate) (PMMA), poly(methyl acrylate) (PMA), and poly(methacrylonitrile) (PMAN) is discussed in this article. In addition to homopolymers, 2D heteronuclear single-quantum coherence (HSQC), total correlation spectroscopy (TOCSY), and heteronuclear multiple-bond correlation (HMBC) study of different copolymers such as poly(methyl methacrylate-co-methyl acrylate), poly(styrene-co-methyl methacrylate), and poly(methyl methacrylate-co-methacrylonitrile) have also been reported here. This in turn helps in microstructural analysis of terpolymers such as poly(methacrylonitrile-co-styrene-co-methyl methacrylate), poly(acrylonitrile-co-methyl methacrylate-co-methyl acrylate), and poly(ethylene-co-vinyl acetate-co-carbon monoxide).

Dynamics of adsorbed poly(methyl acrylate) and poly(methyl methacrylate) on silica

2003 ◽  
Vol 281 (3) ◽  
pp. 197-202 ◽  
Author(s):  
Frank D. Blum ◽  
Wuu-Yung Lin ◽  
Crystal E. Porter
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Poly Methyl Methacrylate

Identification and Quantitation of Volatile Organic Compounds in Poly(methyl methacrylate) Kitchen Utensils by Headspace Gas Chromatography/Mass Spectrometry

2014 ◽  
Vol 97 (5) ◽  
pp. 1452-1458 ◽  
Author(s):  
Hiroyuki Ohno ◽  
Motoh Mutsuga ◽  
Yoko Kawamura
Keyword(s):  
Volatile Organic Compounds ◽  
Methyl Methacrylate ◽  
Organic Compounds ◽  
Methyl Acrylate ◽  
Room Temperature ◽  
Gas Chromatography Mass Spectrometry ◽  
Poly Methyl Methacrylate ◽  
Volatile Organic ◽  
Headspace Gas ◽  
First Time

Abstract A headspace GC/MS method was developed for identification and quantitation of residual volatile organic compounds in poly(methyl methacrylate) (PMMA) kitchen utensils. A sample was cut into small pieces, then N,N-dimethylacetamide was added in a headspace vial and sealed. After storing for more than 1 day at room temperature, the vial was incubated for 1 h at 90°C, and the headspace gas was analyzed by GC/MS. In 24 PMMA kitchen utensils, 16 volatile organic compounds including methyl methacrylate, methyl acrylate, toluene, 2-methyl-1-butene, 2-methyl-2-butene, 2-methylpropanal, methyl propionate, methyl isobutyrate, trans-3-heptene, heptane, cis-3-heptene, trans-2-heptene, cis-2-heptene, 2,4,4-trimethyl-1-pentene, 2,4,4-trimethyl-2-pentene, and 1-octene were identified and quantitated. These 15 volatile compounds except methyl methacrylate were found for the first time in PMMA kitchen utensils. Recovery rates from spiked samples were 97.4–104.0% with CV values of 2.8–9.6%. Samples contained 190–7900 μg/g of methyl methacrylate, 26–810 μg/g of methyl acrylate, and 2–1300 μg/g of toluene; other compounds were at levels less than 100 μg/g. Methyl methacrylate was the main monomer of PMMA and methyl acrylate was a comonomer; toluene should be used as a solvent.

Reactivities of Monomers Towards the 1-Methyl-1-(methoxycarbonyl)ethyl Radical

1994 ◽  
Vol 47 (12) ◽  
pp. 2201 ◽  
Author(s):  
RA Lyons ◽  
E Senogles
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Poly Methyl Methacrylate ◽  
Ethyl Radical

The relative reactivities of acrylonitrile, methyl acrylate , methyl methacrylate and styrene towards the 1-methyl-1-( methoxycarbonyl )ethyl radical have been determined at 60°C, and the results compared with those for the poly (methyl methacrylate ) radical. The results for methyl acrylate suggest that the copolymerization of this monomer with methyl methacrylate is adequately described by a terminal mechanism. Those for styrene show that the presence of a penultimate styrene or methyl methacrylate unit in a poly(methyl methacrylate ) radical leads to a slightly greater preference for this radical to add styrene over methyl methacrylate compared to the 1-methyl-1-( methoxycarbonyl )ethyl radical. The results for methyl methacrylate and acrylonitrile suggest that the copolymerization of these monomers is probably best represented by a penultimate mechanism.

Studies on Thermomechanical Characteristics of Poly(Methyl Methacrylate) and Ethylene-Methyl Acrylate Copolymer Blends

2012 ◽  
Vol 20 (8) ◽  
pp. 749-754
Author(s):  
P. Poomalai ◽  
T.O. Varghese ◽  
Siddaramaiah
Keyword(s):  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Mechanical Analysis ◽  
Phase System ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Two Phase ◽  
Poly Methyl Methacrylate ◽  
Acrylate Copolymer ◽  
Ethylene Methyl Acrylate

Blends of poly(methyl methacrylate) (PMMA) with ethylene - methyl acrylate (EMA) copolymers of different compositions, viz. 95/05, 90/10, 85/15 and 80/20 wt.% were prepared by a melt mixing technique using a twin-screw extruder. The blends were characterized by thermo-analytical methods, viz. differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The TGA of PMMA/EMA blends show that thermal degradation takes place in two steps and the temperature of the decomposition rate maximum is proportional to the compositions of the blends. The DSC studies reveal two glass-transition temperatures (Tg) for all the blends corresponding to their individual components which indicates that the blends are incompatible. The DMA thermograms exhibit two steps in the dynamic modulus-temperature curves for higher EMA content, which is characteristic of immiscible polymers in a two phase system.

Sign in / Sign up

Export Citation Format

Share Document