Stable low molecular weight glasses based on mixtures of bisphenol-A and bispyridines

Boileau, Sylvie; Bouteiller, Laurent; Foucat, Eric; Lacoudre, Nelly

doi:10.1039/b106234b

Cited by 18 publications

(17 citation statements)

References 18 publications

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“…The experimental T g values were compared with those calculated with the Fox equation:26, 27 where T g , T g (1), and T g (2) are the glass‐transition temperatures of the copolymer system TEGDMA/ Bis‐GMA, the homopolymer TEGDMA ( T g = −83°C), and the homopolymer Bis‐GMA ( T g = −8.0°C) and X 1 and X 2 are the weight fractions of TEGDMA and Bis‐GMA, respectively. The T g values of the monomers were experimentally determined and agreed with literature values 4, 22…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the light polymerization efficiency of copolymers used in dental formulations by differential scanning calorimetry

Rigoli¹,

Riga²,

Cavalheiro³

et al. 2007

J of Applied Polymer Sci

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Different compositions of visible‐light‐curable triethylene glycol dimethacrylate/bisglycidyl methacrylate copolymers used in dental resin formulations were prepared through copolymerization photoinitiated by a camphorquinone/ethyl 4‐dimethylaminobenzoate system irradiated with an Ultrablue IS light‐emitting diode. The obtained copolymers were evaluated with differential scanning calorimetry. From the data for the heat of polymerization, before and after light exposure, obtained from exothermic differential scanning calorimetry curves, the light polymerization efficiency or degree of conversion of double bonds was calculated. The glass‐transition temperature also was determined before and after photopolymerization. After the photopolymerization, the glass‐transition temperature was not well defined because of the breadth of the transition region associated with the properties of the photocured dimethacrylate. The glass‐transition temperature after photopolymerization was determined experimentally and compared with the values determined with the Fox equation. In all mixtures, the experimental value was lower than the calculated value. Scanning electron microscopy was used to analyze the morphological differences in the prepared copolymer structures. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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Section: Resultsmentioning

confidence: 99%

Evaluation of the light polymerization efficiency of copolymers used in dental formulations by differential scanning calorimetry

Rigoli¹,

Riga²,

Cavalheiro³

et al. 2007

J of Applied Polymer Sci

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“…where T g is the glass‐transition temperature of the MGs, subscripts 1 and 2 represent the two different monomers and w is the weight percentage of each monomer used. The Fox equation is commonly used to describe the composition dependence of T g of ideal copolymers or polymer blends, where strong interactions are absent . Based on the studies by Okubo et al, the T g of MMA‐MAA, MMA‐BMA and MMA‐EA emulsion, calculated from Fox's equation agreed well with the DSC results.…”

Section: Resultsmentioning

confidence: 60%

“…The Fox equation is commonly used to describe the composition dependence of T g of ideal copolymers or polymer blends, where strong interactions are absent. 59 Based on the studies by Okubo et al, 60…”

Section: Potentiometric Titration Shown Inmentioning

confidence: 99%

Drug release kinetics of pH‐responsive microgels of different glass‐transition temperatures

Islam

Tan

Kwok

et al. 2018

J of Applied Polymer Sci

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The pH‐responsive microgels (MGs) consisting of methacrylic acid‐ethyl acrylate (MAA‐EA), methacrylic acid‐butyl methacrylate (MAA‐BMA) or methacrylic acid‐methyl methacrylate (MAA‐MMA) crosslinked with di‐allyl phthalate (DAP) were synthesized via emulsion polymerization. It was found that the energy required to extract a proton from MGs with higher glass‐transition temperature (Tg) was greater than at a lower Tg. Procaine hydrochloride (PrHy) was used to study the release of a model hydrophobic drug from MGs with different Tgs. A drug selective electrode (DSE) was used to monitor the release as a function of pHs and Tgs. With increasing pH or decreasing Tg, the swelling of MGs was enhanced, leading to greater release of the drug. From the Berens and Hopfenberg model, the contributions of chain relaxation and diffusion processes during a release process were determined. The drug release from lower Tg MGs and at high pH is dominated by diffusion rather than chain relaxation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47284.

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“…[3] Linear supramolecular polymers are possible in which the hydrogen-bonding between end groups defines the main chain of a linear polymeric material. The initial studies demonstrating that it is possible to obtain polymer-like rheological behavior from low molecular weight compounds were reported by Lehn, et al [4] and Meijer, et al [5] Since then, hydrogenbonded supramolecular materials from low molecular weight compounds and low molecular mass polymers have gained much interest, examples of which include stable glasses from mixtures of crystalline compounds; [6,7] strong fibers from the melts of supramolecular polymers; [8][9][10] thermoplastic elastomers with mechanical and rheological properties comparable to high molecular weight covalent polymers; [11][12][13][14][15][16][17][18] and thermo-reversible cross-linked networks prepared by both incorporation of hydrogen-bonding moieties onto the polymer backbone as side chains and end groups, and by addition of hydrogenbonding molecules as fillers or cross-linking agents. [19][20][21][22][23] However, one of the challenges for application driven research in the area of supramolecular polymers is to design and synthesize raw materials and monomeric units that are inexpensive and based on commercially available starting materials or those that are easily synthesized on a large scale in one or two steps.…”

Section: Introductionmentioning

confidence: 98%

Vinyl Monomers, Polymers and Supramolecular Assemblies from Aminocaprolactam

Tarkin-Tas

Tas

Mathias

2012

Macromolecular Symposia

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Summary: a-Aminocaprolactam is a ''green'' monomer in two ways: it is a fermentation product from sugars, and its derivatives are naturally biocompatible and biodegradable. In this overview, the synthesis of a variety of a-amino-e-caprolactam (ACL) derivatives through reaction with acid chlorides, anhydrides, and alkyl halides is described first. The product vinyl and divinyl derivatives were then polymerized using free radical initiators, and the obtained polymers characterized by solution NMR spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. The homopolymers of these monomers displayed surprisingly high glass transition temperature (T g ) values plus unexpectedly large sub-T g transitions that are believed due to relaxation of hydrogen bonding of pendent ACL units that allows group rotation. Finally, bis-and tetra-caprolactams of various diacid chlorides and diisocyantes were synthesized and shown to form self-assembled polymers and networks with excellent physical and thermal properties.

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Stable low molecular weight glasses based on mixtures of bisphenol-A and bispyridines

Cited by 18 publications

References 18 publications

Evaluation of the light polymerization efficiency of copolymers used in dental formulations by differential scanning calorimetry

Evaluation of the light polymerization efficiency of copolymers used in dental formulations by differential scanning calorimetry

Drug release kinetics of pH‐responsive microgels of different glass‐transition temperatures

Vinyl Monomers, Polymers and Supramolecular Assemblies from Aminocaprolactam

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