Papers by Keyword: Methyl Methacrylate

Abstract: Some membrane processes, such as organic solvent nanofiltration, require membranes with strong chemical resistance to endure harsh chemical environments. Polymeric membranes, while possessing excellent separation properties, are mostly lacking in this area. Due to its inherent chemical resistance, polyimide (PI) stands out as a highly promising material, with the potential to excel in diverse applications where resilience to harsh environments is essential. Therefore, this study attempts to perform a surface modification on PI membrane via radiation induced graft copolymerization (RIGC) of methyl methacrylate (MMA) as the monomer, known to further enhance chemical resistance and organic solvent separation of the membrane. The effects of MMA concentration (0.5, 1.0, 1.5 and 2.0 M) and radiation dose (50, 100, 150 and 200 kGy) on the degree of grafting of poly (methyl methacrylate) (PMMA) and the properties of resultant PI-graft (g)-PMMA membranes were investigated. The PI-g-PMMA membranes were characterized using atomic force microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, thermogravimetric analysis and contact angle analysis. The interplay between MMA concentration and radiation dose has not only affected the degree of grafting but also the membrane properties. In conclusion, the findings feature the immense potential of the RIGC technique to modify a highly stable PI membrane to survive in demanding applications within harsh chemical environments.

Abstract: The monomer phenyl acrylamide was synthesized by reacting acrylamide with chloro benzene in the presence of pyridine. Copolymer of phenyl acrylamide (PAM) with methyl methacrylate (MMA) was synthesized by free radical technique using dimethylsulfoxide (DMSO) as solvent and benzoyl peroxide (BPO) as initiator. The overall conversion was kept low (≤ 15% wt/wt) for all studies copolymers samples. The synthesized copolymers were characterized using fourier transform infrared spectroscopy (FT-IR), and their thermal properties were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The copolymers compositions were determined by elemental analysis. The monomer reactivity ratios have been calculated by linearization methods proposed by Kelen-Tudos and Fineman-Ross. The derived reactivity ratios (r₁, r₂) for (PAM-co-MMA) are: (0.03, 0.593). The microstructure of copolymers and sequence distribution of monomers in the copolymers were calculated by statistical method based on the average reactivity ratios and found that these values are in agreement with the derived reactivity ratios. Copolymers of PAM with MMA formed alternating copolymers.

Abstract: Two core-shell structure poly methyl methacrylate-caprolactam (PMMA-CPL) and poly methyl methacrylate-caprolactam-sericin (PMMA-CPL-SS) nanoparticles were synthesized by emulsion polymerization. A latex blending process was performed on preparation of natural rubber (NR) blends, NR/PMMA-CPL and NR/PMMA-CPL-SS. Transmission electron microscopy (TEM) images showed that PMMA-CPL and PMMA-CPL-SS nanoparticles covering on the surface of NR particles homogeneously. SEM, AFM, ATR-FTIR and DSC were used to compare the difference between NR/PMMA-CPL-SS and NR/PMMA-CPL. The results showed that addition of SS improved the smoothness and reduced the amount of incompatible particles on the surface of NR/PMMA-CPL-SS film. Due to the introduction of CPL and SS, the number of escaping particles on the surface of NR was decreased during film forming process and the Tg of NR shifted to a higher temperature. The results indicated that the interfacial adhesion and compatibility of PMMA and NR were improved. Mechanical testing showed that PMMA-CPL nanoparticles could improve the mechanical property of NR. When the content of PMMA-CPL-SS was 10%, the tensile strength of NR/PMMA-CPL-SS film was increased by 19.6% compared to NR/PMMA-CPL. Moreover, the NR/PMMA-CPL-SS film exhibited a higher hydrophilic property after modification with PMMA-CPL-SS nanoparticles.

Abstract: Graft copolymer of Amylopectin and PMMA was synthesized by atom transfer radical polymerization (ATRP) method. The hydroxyl groups of amylopectin partially substituted with tert-butyl a-bromoisobutyrate to form tert-butyl a-bromoisobutyrate (TBBiB ) groups. This compound is known as an efficient macro-initiator for ATRP process. This research, aimed to obtain a bio based polymer of Amylopectin, in which the amylopectin was used as macro-initiator in the ATRP of MMA. The experiment was carried out in the homogeneous system under temperature range of 40 – 70°C in DMSO solution using TEA as catalyst. The modified amylopectin-TBBiB then was grafted to methyl methacrylate trough ATRP. Product characterization indicates that the graft copolymer Amylopectin-g-PMMA is efficient and the obtained product owns well defined structures

Abstract: The gamma irradiation was utilized to facilitate the synthesis of poly (glycerol sebacate)-co-lactic acid (PGS-co-LA). The effect of methyl methacrylate (MMA) crosslinker and varying dosage of irradiation to the structural composition and thermal properties of the synthesized PGS-co-LA was investigated. Compositional analyses of the polymer materials using infrared spectroscopy confirm the covalent formation of ester linkage. The use of methyl methacrylate enhances the formation of the characteristic bonds in the polymer structure. The intensity of these peaks increases with increasing irradiation dosage and high amount of crosslinker. The melting temperature of the PGS-co-LA becomes more negative with the incorporation of high amount of MMA.

Abstract: Methyl Methacrylate (MMA)/acrylic acid (AA)/N,N’-4,4’-Diphenylmethane-bismaleimide (BMI) copolymer was synthesized by free radical polymerization. The copolymer was characterized by the Fourier Transform Infrared (FTIR), and the memory characteristic of the device was investigated by current-voltage (I-V) test. The structure of the memory device which is based on MMA/AA/BMI copolymer was sandwich, the bottom electrode was indiumtin oxide (ITO) and the top electrode was Al. The ON/OFF current ratio of the ITO/(MMA/AA/BMI copolymer)/Al memory device is ≥1×10² and the switching threshold voltage is about 1.8v.

Abstract: A novel, well-defined, amphiphilic block copolymer was synthesized by RAFT copolymerization of 2-(dimethylamino) ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA). The polymer structure was characterized by ¹H NMR , GPC and TEM. It was found that the stable spherical micelles with core-shell structure are formed and good solubility in water. The copolymer would have great potential in drug delivery systems.

Abstract: A novel PPy/P(BA-co-AA)-g-PMMA-GMA (terpolymer) composites were prepared and the preparation conditions, characterization and properties of the composites were investigated. The results indicate that the oxidant types, molar ratio of oxidant/monomer, polymerization time, PPy content affect greatly the conductivity of the PPy/terpolymer composites. The ultimate elongation of composites decreases with increasing PPy content,while high PPMM content brings forth high tensile strength.

Abstract: A novel PPy/PBA-g-PMMA-GMA (copolymer) composites were prepared and the preparation conditions, characterization and properties of the composites were investigated. The results indicate that the oxidant types, molar ratio of oxidant/monomer, polymerization time, PPy content affect greatly the conductivity of the PPy/terpolymer composites. The ultimate elongation of composites decreases with increasing PPy content,while high PPMM content brings forth high tensile strength.

Abstract: This paper is mainly aimed at the problem of low bonding strength of soy bean protein adhesive,poor water resistance,with methyl methacrylate and vinyl acetate composite study made with rubber manufacturing class II plywood,meet the national standard,so as to solve the water resistance of soy protein adhesives and bonding strength of.Experiments that 3.5g soy protein, 5g PVA, 30g MMA, 0.3g APS and 100g water, modified soy protein adhesive bonding strength obtained is excellent, and cost reduction.Preparation of soybean protein-acrylate adhesive solid content,viscosity and strength of plywood detection.