Synthesis and characterization of (4-arm-star-PMMA)/PMMA-g-SiO2 hybrid nanocomposites

Thi

Hoàng

et al. 2019

JST

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This study presents the qualitative and quantitative analyses of Fourier Transform Infrared (FTIR) spectra of poly(methyl methacrylate)/poly(vinyl chloride) blends (PMMA/PVC), as well as PVC-g-PMMA graft copolymers. Graft copolymerizations of methyl mathacrylate (MMA) onto PVC macromolecules were carried out mixture of cyclohexanone/N,N-dimethylformamide as solvents, dibenzoyl peroxide as initiator and nitrogen medium. FTIR spectra of PMMA/PVC blends showed that there were molecular interactions between C=O groups of PMMA and C-Cl groups of PVC. Assignments of infrared absorption bands for specific groups of PMMA/PVC blends have been contributed. Using regression method, linear calibration curve between PMMA mole content and peak areas of C=O groups in FTIR spectra of the blends has been found when C=O peak areas were multiplied by an appropriate factor. PMMA grafted content and total PMMA formed content in PVC-g-PMMA graft copolymers have been evaluated. The results showed that grafted PMMA content was increased since PVC was initiatly dechlorinated by NaOH solution. The grafted PMMA content and total formed PMMA content were 5.05 wt.% and 11.25 wt.% respectively when MMA monomers were grafted onto neat PVC and modified PVC molecules.

Section: Methodsmentioning

confidence: 99%

PREPARATION AND FTIR STUDIES OF PMMA/PVC POLYMER BLENDS, PVC-g-PMMA GRAFT COPOLYMERS AND EVALUATING GRAFT CONTENT

Thi

Hoàng

et al. 2019

JST

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“…[23][24][25] Figure 1b shows that all specific groups of PMMA can be seen clearly, such as: C-H vibrations in the region of 2800 -3000 cm -1 , (C=O) at 1733 cm -1 , (C-H) at three bands of 1484, 1448, 1387 cm -1 range, (C-O-C) at four bands of 1242, 1270, 1148 and 1192 cm -1 . [20] Compared to (C-Br) appeared at 648 cm -1 in FTIR spectra of PT-4Br, the weak peak at 652 cm -1 in spectra of 4sPMMA can be attributed to its (C-Br) end groups. Figure 2 displays the 1 H-NMR spectra of PT-4Br initiator and 4sPMMA beads, the resonance peak at 4.28 ppm is assigned for the protons of methyl groups attached to O atom (O-CH 2 ) and the integration area for this peak has been normalized to 1.00 or 8H.…”

Section: Characterizationsmentioning

confidence: 89%

“…The mixture was twice diluted by dioxane and passed through a column filled with chromatography silica gel layer to remove the metal catalysts. [20] Polymer sheets were obtained from polymer solution after natural evaporation of solvent in a fume hood, following complete evaporation in a vacuum oven at 80 °C for 4 hours and at 40 °C for 12 hours. Fine powder beads was made by using a mini high speed pulverizing machine and sieving with 200 µm sieve.…”

Section: Synthesis Of 4-arm Pmma (4spmma) Beadsmentioning

confidence: 99%

“…In these spectra, the peaks at 3.30 and 2.48 ppm are also of the residue solvents. [20] Figure 3 represents a FESEM image of 4sPMMA beads, showing that their size ranges from 10 to about 100 µm with random shapes due to pulverizing blades. It should be noted that the sieve with 200 µm mesh was used in collecting beads, however, only the beads with size less than 100 µm or a bit larger can pass through the sieve due to the mesh friction and gentle force applied during hand shaking.…”

Section: Characterizationsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of star PMMA via ARGET ATRP towards application in acrylic bone cements

Vietnam Journal of Chemistry

Huynh

Dung

et al. 2021

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In this study, we attempted to apply a four‐arm star poly(methyl methacrylate) (4sPMMA) as a prepolymer of acrylic bone cement. The 4sPMMA with viscosity average molecular weight of about 45 kDa was synthesized via Atom Transfer Radical Polymerization method using Activators Regenerated by Electron Transfer (ARGET ATRP). In practical use, the fine powder of precipitated 4sPMMA was changed to rigid beads followed by making sheet and pulverizing. Proton nuclear magnetic resonance (HNMR), Fourier transform infrared (FTIR) spectra of 4sPMMA beads indicated the star structure of 4sPMMA with bromide end groups (C‐Br). Scanning electron microscopy (SEM) image of 4sPMMA beads showed their random shapes with size in the range of 10‐100 μm, no traces of residual metal catalysts (Cu and Sn) were detected by Energy Dispersive X‐Ray (EDX) analysizer equipped with SEM instrument. Bone cement from 4sPMMA beads had been prepared manually and curing in rectangular and cylindrical molds. The setting characterization results showed that 4sPMMA bone cements exhibited lower maximum temperature (63.9 °C), lower setting temperature (45.6 °C), than those required in ISO 5833:2002. Other properties of 4sPMMA bone cement, such as bending strength, bending modulus and setting time met the requirements of above ISO standard.

“…In the temperature region from 200 to 650°C, both two types of undoped and doped electrolyte samples undergo thermal degradation of organic moieties and decomposition of magnesium salt. In this temperature range, the GPBE.0 sample undergoes degradation with two distinct stages, the first stage starts from 220°C to 330°C with the onset temperature of 277.4°C, and this can be attributed to the dehydrochlorination of PVC and unsaturated groups of PMMA [16,29,30]. The second stage starts from 330 to 650°C with char residual of about 8 wt.%.…”

Section: Tensile Properties Tablementioning

confidence: 99%

Effect Of Magnesium Perchlorate Content on the Mechanical, Thermal Stability, and Dielectric Properties of Plasticized PMMA/PVC-g-PMMA Electrolytes

Dung¹,

Linh²,

Advances in Polymer Technology

et al. 2020

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In this study, new types of gel polymer blend electrolytes (GPBEs) were prepared with the synthesized PVC-g-PMMA graft copolymer, PMMA, plasticizers (propylene carbonate (PC), dioctyl phthalate (DOP)), and different loadings of Mg(ClO4)2 via the solution casting method using tetrahydrofuran as solvent. Fourier transform infrared (FTIR) spectra of the electrolytes showed mutual molecular interactions between Mg(ClO4)2 and organic moieties. The scanning electron microscopy images of the GPBEs showed their wrinkled surface morphology due to their low elastic modulus and high flexibility. Energy-dispersive X-ray (EDX) spectroscopy and mapping technique revealed the regular distributions of all atomic elements such as Cl, Mg, O, and C in the doped GPBEs. With increasing the Mg salt concentration, Young’s modulus and tensile strength of the GPBEs strongly decreased. Interestingly, the elongation at break of the GPBEs was higher than that of neat (undoped) GPBE and achieved the highest value of 215% at the salt content of 20 wt.%. The AC conductivity and ionic conductivity, as well as dielectric permittivity of plasticized PMMA/PVC-g-PMMA/Mg(ClO4)2 GPBE,s increased with frequency and Mg(ClO4)2 doping content. Ionic conductivity of the doped GPBEs can be achieved from 5.51 × 10 − 5 to 4.42 × 10 − 4 (S.cm-1) using Mg(ClO4)2 contents in the range from 10 to 40 wt.%. The doped GPBEs are thermally stable up to 100°C with very low weight losses. The GPBE doped with 20 wt.% of Mg(ClO4)2 can be used as a new type of electrolyte for developing Mg batteries.