Synthesis Characterization and Viscosity Studies of Homopolymer of Methyl Methacrylate and Copolymer of Methyl Methacrylate and Styrene

Vegetable oil-based lubricants have several disadvantages as compared to mineral and synthetic ones, including low viscosity that not encourage the generation of a continuous film when the tribosystem runs, consequently, implying a mixt or boundary. This is why the additivation of such oils is of great interests for researchers, producers and users. This paper presents results of testing the soybean oil additivated with nano graphite (0.25%wt, 0.50%wt and 1%wt) on a four ball machine. The friction coefficient is slightly increased for the additivated lubricants, but no evident dependency on concentration and test conditions was noticed. Supplementary tests will give the opportunity of a statistical approach of this parameter. Any concentration of nano graphite makes the wear parameter (wear scar diameter) to slightly increase as compared to the values obtained for the non-additivated soybean oil. The increase of the nano graphite concentration in this vegetable oil does not influence significantly the wear parameter, meaning that, at least for the tested regime, this is not an efficient anti-wear additive.

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“…The average molecular weight of the prepared polymeric additives was determined by a viscometric technique 28 …”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Soybean Oil as a Biocompatible Multifunctional Additive for Lubricating Oil

Karmakar

Ghosh

2014

ACS Sustainable Chem. Eng.

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“…From Mark‐Houwink equation, the viscosity [η] is only determined by molecular weight M of polymer after we are sure about chemical composition of polymer, solvent, and temperature

([]|, η) = K M^{α}

…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of a foam regulator with ultra‐high molecular weight

Zhan

Zhong

et al. 2016

J of Applied Polymer Sci

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Multistage emulsion polymerization was used to prepare ultra-high molecular weight foam regulator of low cost, with methyl methacrylate (MMA), butyl acrylate (BA), styrene (St) as main raw materials. Ubbelohde viscometer, dynamic light scattering, infrared and raman spectra, TEM, DSC, TGA, and GPC were all used to characterize constituent and structure, morphology, and molecular weight. As a result, when the ratio of soft monomer (BA) and hard monomer (St 1 MMA) is 1:3, MMA:St 5 4:1, potassium persulfate (KPS): 0.15%, sodium hydrogen sulfite (SHS): 0.05%, azodiisobutyronitrile (AIBN): 0.15%, divinyl benzene (DVB): 0.3%, the final product terpolymer has obvious core-shell structure and ultra-high molecular weight (M w 5 1,400,000). This kind of foam regulator showed improvements in the melt strength, prevention of bubble coalescence and reduction on cost when compared with the traditional. Finally, the coefficients of poly (methyl methacrylate-butyl acrylate-styrene) terpolymer's Mark-Houwink equation were calculated with tetrahydrofuran (THF) solvent at 25 8C.

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“…In viscometric method, the viscosity average molecular weight (M) was calculated using Mark Houwink-Sukurda relation (MHS) (Eq. 1) by Ubbelohde OB viscometer at 40°C taking eight different concentrations (g cm -3 ) of the polymeric additives in toluene [14,15]. Chronometer was used for recording flow times.…”

Section: Methodsmentioning

confidence: 99%

“…Viscometric measurements were carried out at 40°C in toluene solution using Ubbelohde OB viscometer as per the method discussed earlier [14].…”

Section: Viscometric Measurementsmentioning

confidence: 99%