The determination of n-pentane solubility and diffusivity in styrene–methyl methacrylate copolymers via designed apparatus

2016 ◽  
Vol 53 (3) ◽  
pp. 319-331 ◽  
Author(s):  
Hamid Reza Azimi ◽  
Mostafa Rezaei
Keyword(s):  
Methyl Methacrylate ◽  
Suspension Polymerization ◽  
The Self ◽  
Polymerization Process ◽  
Methacrylate Copolymers ◽  
Methacrylate Copolymer

In this work, styrene–methyl methacrylate copolymer particles were synthesized by suspension polymerization process with different copolymer compositions. A system was designed to measure the solubility and diffusivity of n-pentane in the synthesized copolymers. The designed system consisted of the self-sealing cell equipped to the pressure and temperature controllers. The synthesized copolymer particles were impregnated by n-pentane and their expansion were recorded visually. Furthermore, the solubility and diffusivity of n-pentane in copolymer particles were measured by the same apparatus. The effect of different foaming conditions on the solubility and diffusivity of n-pentane in the samples were examined. It was concluded that the sorption pressure and temperature have contradictory effects on the solubility and diffusivity of n-pentane in styrene–methyl methacrylate copolymers at different sorption pressures. It was concluded that with methyl methacrylate content increment in copolymer, the diffusivity and dissolved n-pentane content in copolymer were reduced.

Structure determination of clay/methyl methacrylate copolymer interlayer complexes by means of 13C solid state n.m.r.

Polymer ◽  
1998 ◽  
Vol 39 (12) ◽  
pp. 2651-2656 ◽  
Author(s):  
Claudia Forte ◽  
Marco Geppi ◽  
Silvia Giamberini ◽  
Giacomo Ruggeri ◽  
Carlo Alberto Veracini ◽  
...  
Keyword(s):  
Solid State ◽  
Methyl Methacrylate ◽  
Structure Determination ◽  
Methacrylate Copolymer

Mass-suspension polymerization process as an efficient tool to produce polymer/clay nanocomposites

2021 ◽  
Vol 04 ◽  
Author(s):  
Mariaugusta F. Mota ◽  
Thainá Araruna ◽  
Nathália M. Campelo ◽  
Meiry Gláucia F. Rodrigues ◽  
Gabriella R. Ferreira ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Suspension Polymerization ◽  
Experimental Studies ◽  
Ethyl Acrylate ◽  
Polymerization Process ◽  
Basal Spacing ◽  
Polymeric Nanocomposites ◽  
Poly Methyl Methacrylate ◽  
Modified Clays

Background: This work presents the preparation and characterization of the polymeric nanocomposites based on methyl methacrylate (MMA), ethyl acrylate (EA), and natural and modified clays. The clays used to prepare the composite were natural green bentonite (GBC-N) and organophilic clays modified with ammonium quaternary salts: Praepagen (GCBP), Dodigen (GCB-D) and Praepagen/Dodigen mixture 1:1 in weight (GCB-P/D). Objective: The experimental studies focused on the evaluation of the effect of clays (in natura and chemically modified) on the final quality of the polymeric nanocomposites containing around 3 wt%. of clay nanocharges in association with MMA to produce poly(methyl methacrylate)/clays; and MMA/EA to form poly(methyl methacrylate-co-ethyl acrylate)/clays. Materials and Methods: The poly(methyl methacrylate)/clay and poly(methyl methacrylate-co-ethyl acrylate)/clay materials were synthesized through mass-suspension polymerization process. The natural and modified green bentonite clays were characterized by X-ray powder diffraction (XRD), infrared spectroscopy (IR), Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) analyzes to understand its effect on the basal spacing, d001 (compared to the pure clay), as a result of cation exchange step, in which also improved the thermal efficiency of the final nanocomposites. Results: The proper incorporation of MMA and MMA/AE monomers between the layers of natural and modified clays occurred through in situ mass-suspension polymerization, leading to a successful exfoliation of clay layers during the growth of the polymer chains. Conclusion: The IR, SEM, TGA and DSC analyzes confirmed the improvement in the thermal property of the composites compared to polymers formed in the absence of clays. The experimental results are very promising, indicating that the experimental protocol based on the in situ formation of polymer nanocomposites by the using sequential mass-suspension polymerization consist of an interesting tool.

Two-dimensional NMR determination of the conformation of an alternating styrene-methyl methacrylate copolymer

1987 ◽  
Vol 20 (7) ◽  
pp. 1701-1707 ◽  
Author(s):  
Peter A. Mirau ◽  
Frank A. Bovey ◽  
Alan E. Tonelli ◽  
Sharon A. Heffner
Keyword(s):  
Methyl Methacrylate ◽  
Two Dimensional ◽  
Methacrylate Copolymer
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