Synthesis and characterization of new monomer and polymers of hindered silyl styrene

Assadi, M. G.; Golipour, N.

doi:10.1163/156855507779763667

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…Incorporation of a tertiary substituted group into the polymer can significantly increase T g compared to unmodified polymers without this bulky group because the steric hindrance of the bulky group reduces the mobility of the polymer backbone. ,− In addition, it was also found that the T g increase for ortho substitution is much greater than the T g increase for para substitution, which may be interpreted to mean that the steric hindrance at the ortho position creates a greater restriction on backbone motion because the ortho position is closer to the backbone. Even though the two substituent groups are at meta positions in PDTMSS or PDtBS, they are very bulky and also quite close to the polymer backbone.…”

Section: Resultsmentioning

confidence: 99%

Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s

et al. 2020

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During the course of studying silicon-containing diblock copolymers, it was discovered that poly(3,5di(trimethylsilyl)styrene)-block-poly(3,4-methylenedioxystyrene) (PDTMSS-b-PMDOS) showed very unusual thermal properties. The material can be recovered as a free-flowing powder despite heating above 250 °C. To better understand this behavior, homopolymers of the 3,5-disubstituted styrenes, poly(3,5-di(trimethylsilyl)styrene) (PDTMSS) and poly(3,5-di-tert-butylstyrene) (PDtBS), were prepared. These polymers are soluble in common organic solvents and formed clear, glassy thin films upon spin coating. These homopolymers were studied by differential scanning calorimetry (DSC), broadband dielectric spectroscopy (BDS), dynamic mechanical analysis (DMA), and temperature-programmed ellipsometry. These experiments document the lack of a conventional glass transition in these materials below their decomposition temperature. A series of statistical copolymers of PDTMSS and PDtBS with styrene was synthesized and studied by DSC in an attempt to establish the T g of the homopolymers by model-based extrapolation.

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Section: Resultsmentioning

confidence: 99%

Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s

et al. 2020

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“…This is the expected result because the C-OBMI-St-AGC-APTES sample is obtained by the crosslinking of OBMI-St-AGC-APTES. In the literature, it was explained that the polymer samples showed higher Tg after silanization [ 60 , 61 ].…”

Section: Resultsmentioning

confidence: 99%

Styrenated Oil Synthesis with Cyclic Carbonate Functional Groups on Polystyrene Segment

Bingöl

Erciyes

2021

Polymers

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In this study, an oil-modified copolymer of 4-[(prop-2-en-1-yloxy)methyl]-1,3-dioxolan- 2-one (AGC) with styrene was synthesized, and the resulting copolymer (OBMI-St-AGC) was silane functionalized by inserting (3-aminopropyl) triethoxysilane (APTES) into the polymer backbone. OBMI-St-AGC was prepared by using an oil-based macroinitiator (OBMI) obtained by the esterification of linseed oil partial glycerides (PGs) with 4,4-azobis-4-cyanopentanoyl chloride (ACPC). In the characterization, FTIR, 1H NMR, TGA, and DSC analyses were applied. The silane-functionalized copolymer (OBMI-St-AGC-APTES) was crosslinked through the sol–gel process, and its crosslinked structure was determined.

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“…4-Chloromethylstyrene (CMS), also called 4-vinylbenzylchloride (VBC), is a monomer that can be reacted with a series of reagent to produce polymer with functional groups [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ionic liquid functionalized polymers for drug delivery of an anti-inflammatory drug

Hosseinzadeh

Mahkam

Galehassadi

2012

Designed Monomers and Polymers

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Polymeric forms of ionic liquids have many potential applications because of their ionic nature. Two ionic liquid monomers, 1-(4-vinylbenzyl)-3-methyl imidazolium hexafluorophosphate (VMIH) and 1-(4-vinylbenzyl)-4-(dimethylamino)-pyridinium hexafluorophosphate (VDPH), were synthesized through the quaternization of N-methylimidazole and 4-(dimethylamino) pyridine with 4-vinylbenzylchloride, respectively, and a subsequent anion exchange reaction with potassium hexafluorophosphate. The homopolymers of VMIH, VDPH, and its copolymers with methyl styrene (in various mole ratios) were synthesized by free radical polymerizations at 70°C using α,α′-azobis(isobutyronitrile) as an initiator. Anionic drug molecule, naproxen (an anti-inflammatory drug), was effectively loaded into these positive charges polymers (PCP) and remained inside of the PCP under acidic environment (pH 2-6.5). The amount of loading of drug was increased with increasing positive charge densities resulting from the increasing number of ionic liquids groups. PCP as a controllable release of anionic drug molecules can be used as an oral delivery drug systems targeting at intestine. This drug can be remained trapped in the polymers when passing through the acidic and neutral environment and be released in intestine, where the environmental pH is close to basic.

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Synthesis and characterization of new monomer and polymers of hindered silyl styrene

Cited by 6 publications

References 17 publications

Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s

Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s

Styrenated Oil Synthesis with Cyclic Carbonate Functional Groups on Polystyrene Segment

Synthesis and characterization of ionic liquid functionalized polymers for drug delivery of an anti-inflammatory drug

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