Proton NMR composition analysis of styrene-.alpha.-methylstyrene-butadiene terpolymer

Mühl, Jasenka; Srića, Vlasta; Jarm, V.; Kovač-Filipović, M.

doi:10.1021/ie00100a035

Cited by 3 publications

(2 citation statements)

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“…Determination of composition of synthesized copolymers in mineral base oil is performed by 1 H NMR. To determine the amount of residual monomers and overall molar monomer conversion during the polymerization time, the 1 H NMR spectra for all monomers present in the initial reaction mixture such as styrene (Sty), dodecyl methacrylate (DDMA), octadecyl methacrylate (ODMA), and N , N -dimethylaminoethyl methacrylate (DMAEM) were recorded and interpreted . The chemical shifts for certain types of protons in the chemical groups that appear in the monomers involved in polymerization reactions are given in Table .…”

Section: Resultsmentioning

confidence: 99%

Production and Application Properties of Dispersive Viscosity Index Improvers

Jerbić

Vuković²,

Jukić

2012

Ind. Eng. Chem. Res.

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Polymeric dispersive viscosity index improvers of lubricating mineral oils based on styrene, dodecyl-methacrylate, octadecyl methacrylate, and N,N-dimethylaminoethyl methacrylate (d-PSAMA) were produced by performing copolymerizations isothermally up to the high conversion in mineral base oil solution, using monofunctional or bifunctional peroxide initiator. The obtained kinetics results reveal the benefits of the usage of a bifunctional peroxide initiator over a monofunctional, because complete conversion of monomers was accomplished in the shorter reaction time, performing the process in a full batchwise mode. When the bifunctional initiator was applied, the required polymerization temperature was slightly higher (105 °C), and copolymers of higher average molecular weight values (M w = 60−120 kg mol −1 ) were obtained, while in case of the monofunctional peroxide initiator, the reaction temperature was 100 °C, and average molecular weight values of copolymers were M w = 30−100 kg/mol. Investigated application properties demonstrated that d-PSAMA additives were fully comparable with conventional pure methacrylate additives, and also it provided other advantages such as higher viscosity index and kinematic viscosity, lower values of pour point temperatures, as well as better dispersant and detergent properties. Thus, by increasing the N,N-dimethylaminoethyl methacrylate share in copolymers from 2 to 10 mol %, their weight average molecular weight decreased from 120 to 60 kg mol −1 , while kinematic viscosity values at 100 °C remain high and amounted to 14.5 ± 0.5 mm 2 s −1 .

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Section: Resultsmentioning

confidence: 99%

Production and Application Properties of Dispersive Viscosity Index Improvers

Jerbić

Vuković²,

Jukić

2012

Ind. Eng. Chem. Res.

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“…Additionally, the benzene ring peaks (6.3 ppm -7.2 ppm) [52] associated with the S segment were completely absent upon hydrogenation. Methyl and methylene protons in all monomer units resonated in the range of 0.9 ppm -2.4 ppm, with the overlapping peak at 1.2 ppm being the characteristic signal of α-MS. [53] In the 13 C NMR spectrum in (Fig. 15), the C=C peaks (130.3 ppm, 129.8 ppm, 32.8 ppm, and 27.5 ppm) of α-SBS1 disappeared, while new peaks corresponding to the −CH2 (36.4 ppm, 34.7 ppm, and 30.1 ppm) [6] appeared in α-CBC1.…”

Section: Structure and Thermal Properties Analysis Of Polymersmentioning

confidence: 99%

A new α-CBC polymer with elevated heat-resistance prepared via catalytic hydrogenation of α-methylstyrene-butadiene-styrene terpolymer over Ni x Pd/NCNT@MFN monolithic catalyst

Cao,

Qian,

Cao

et al. 2024

Preprint

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Elevating the heat resistance of the highly transparent cyclic block copolymer CBC is of great significance for the synthesis of high performance polymers. In this study, a novel bimetallic Ni x Pd/NCNT@MFN catalyst was prepared and applied in the hydrogenation of α methylstyrene butadiene styrene ( α SBS) ternary block copolymer. Ni 2 Pd/NCNT@MFN exhibited excellent catalytic performance, and after 8 hour s of reaction, a new fully hydrogenated polymer α CBC was obtained. The hydrogenation of the butadiene segment in α SBS bec a me more difficult as the length of the segment increase d . The pr esence of α methyl result ed in the highest adsorption activation energy for the α methylstyrene monomer unit, leading to a longer hydrogenation time with increasing length of this segment. Furthermore, t he introduction of α methylstyrene not only increased the glass transition temperature of the styrene and α methylstyrene S) segment s in α SBS, but also increased the glass transition temperature of α CBC even more after hydrogenation. This conclusion provides valuable theoretical guidance for the synthesis of high heat resistant α CBC polymers.

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