Preparation and Properties of Mma/1-Propylmethacrylate-Poss Copolymer With Atom Transfer Radical Polymerization

Zhang, Hexin; Lee, Ho-young; Shin, Young-jun; Lee, Dong‐Ho; Noh, Seok Kyun

doi:10.1142/s0256767908003230

Cited by 6 publications

(1 citation statement)

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“…An additional complicating, but important parameter is the reactivity ratio of the two comonomers. From the data provided by hybrid plastics [30,31], in a mixture of methyl methacrylate (MMA) and monomethacryl-based POSS, the POSS reactivity ratio, r POSS , is below 1 while the reactivity ratio of MMA, r MMA , is above 1. In the case of methacryloxypropyl-heptaisobutyl POSS, the reactivity ratios for POSS and MMA are 0.584 and 1.607, respectively.…”

Section: Resultsmentioning

confidence: 99%

Anchor Effect in Polymerization Kinetics: Case of Monofunctionalized POSS

et al. 2019

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The effect of the anchoring group on the detailed polymerization kinetics was investigated using monomethacryloxy-heptaisobutyl POSS (1M-POSS). This compound was copolymerized with lauryl methacrylate (LM) as the base monomer, at various molar ratios. The process was initiated photochemically. The polymerization kinetics were followed by photo-DSC and photorheology while the polymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). For comparison, a methacrylate containing the branched siloxy-silane group (TSM) was also studied. It was found that the modifiers with a bulky substituent have a dual effect on the termination process: (i) At low concentrations, they increase the molecular mobility by increasing the free volume fraction, which leads to an acceleration of the termination and slows the polymerization; while (ii) at higher concentrations, they retard molecular motions due to the “anchor effect” that suppresses the termination, leading to acceleration of the polymerization. The anchor effect can also be considered from a different point of view: The possibility of anchoring a monomer with a long substituent (LM) around the POSS cage, which can further enhance propagation. These conclusions were derived based on kinetic results, determination of polymerization rate coefficients, and copolymer analysis.

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Section: Resultsmentioning

confidence: 99%

Anchor Effect in Polymerization Kinetics: Case of Monofunctionalized POSS

et al. 2019

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Recent developments in nanostructured polyhedral oligomeric silsesquioxane‐based materials via ‘controlled’ radical polymerization

Hussain

Shah

2014

Polymer International

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Polyhedral oligomeric silsesquioxane (POSS) compounds consist of unique three-dimensional nanocages with a general composition of (RSiO 1.5 ) n , where R groups are organic moieties for enhanced physical and chemical compatibility of inorganic POSS frameworks with organic systems. Due to their unique size, structure and properties there has been tremendous progress over the last decade or so in the chemistry and applications of POSSs in various fields of materials, nanoscience and nanotechnology. Advances in synthetic polymer chemistry, particularly the advent of 'controlled' radical polymerization (CRP), namely atom transfer radical polymerization, reversible addition-fragmentation chain transfer and nitroxide-mediated polymerization, have enabled polymer chemists to integrate inorganic POSS nanocages into welldefined copolymers of almost any architecture, thus generating nanostructured materials with controlled molar masses and compositions, and well-defined and tunable morphologies. Thus, these new strategies of employing POSS nanocages in polymer chemistry could lead to potential new applications in various areas of nanoscience and nanotechnology. The present paper covers recent trends and developments over the last five years or so in POSS-based nanostructured materials via CRP. Also included is the combined CRP and 'click' chemistry approach to achieve POSS-containing well-defined hybrid copolymers.

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Nitroxide mediated miniemulsion polymerization of methacryloisobutyl POSS: Homopolymers and copolymers with alkyl methacrylates

Tajbakhsh

Marić

2020

Journal of Polymer Science

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Nitroxide mediated polymerization (NMP) of methacryloisobutyl POSS (POSSMA) was conducted in a dispersed aqueous miniemulsion at 90 C, resulting in stable latexes with particle sizes = 225-260 nm at solids loading = 22%. POSSMA homopolymers with M n up to 35.9 kg mol −1 (Đ < 1.53) was prepared using Dispolreg 007 alkoxyamine without any controlling comonomers, as is traditionally required for NMP of methacrylates. Copolymers with different ratios of POSSMA and bio-based C13 methacrylic esters were also synthesized (monomer conversion [X] up to 96.5% and 1.42 < Đ < 1.68) to prepare polymer resins with a wide range of glass transition temperatures (T g) or melting points (T m) (−30 C < T g , T m < 96 C). The resulting homopolymers and copolymers exhibited semi-crystalline properties, with crystallite size of 20.3-44.4 Å.

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Preparation and Properties of Mma/1-Propylmethacrylate-Poss Copolymer With Atom Transfer Radical Polymerization

Cited by 6 publications

References 1 publication

Anchor Effect in Polymerization Kinetics: Case of Monofunctionalized POSS

Anchor Effect in Polymerization Kinetics: Case of Monofunctionalized POSS

Recent developments in nanostructured polyhedral oligomeric silsesquioxane‐based materials via ‘controlled’ radical polymerization

Nitroxide mediated miniemulsion polymerization of methacryloisobutyl POSS: Homopolymers and copolymers with alkyl methacrylates

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