Relation between the amount of glycerol, glass transition temperature, and ion content of styrene-methacrylate ionomers

Choi, In-Hwa; Jeong, Yoon-Gwan; Kim, Joon‐Seop

doi:10.1016/j.polymer.2022.125030

Cited by 4 publications

(9 citation statements)

References 46 publications

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“…Accordingly, the polymer chains were able to move freely with high flexibility, resulting in a dramatic drop in the glass transition of the polymer probably below the measurement range (below 29 °C). This phenomenon has been widely described in the literature; for instance, the inclusion of glycerol molecules between the polymer chains usually exerts a plasticising effect and a significant reduction in the polymer glass transition due to the formation of the hydrogen bonds and an increase in the free associated volume of the polymer chains [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Taste Masking of Promethazine Hydrochloride Using l-Arginine Polyamide-Based Nanocapsules

et al. 2023

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Promethazine hydrochloride (PMZ), a potent H1-histamine blocker widely used to prevent motion sickness, dizziness, nausea, and vomiting, has a bitter taste. In the present study, taste masked PMZ nanocapsules (NCs) were prepared using an interfacial polycondensation technique. A one-step approach was used to expedite the synthesis of NCs made from a biocompatible and biodegradable polyamide based on l -arginine. The produced NCs had an average particle size of 193.63 ± 39.1 nm and a zeta potential of −31.7 ± 1.25 mV, indicating their stability. The NCs were characterized using differential scanning calorimetric analysis and X-ray diffraction, as well as transmission electron microscopy that demonstrated the formation of the NCs and the incorporation of PMZ within the polymer. The in vitro release study of the PMZ-loaded NCs displayed a 0.91 ± 0.02% release of PMZ after 10 min using artificial saliva as the dissolution media, indicating excellent taste masked particles. The in vivo study using mice revealed that the amount of fluid consumed by the PMZ-NCs group was significantly higher than that consumed by the free PMZ group (p < 0.05). This study confirmed that NCs using polyamides based on l -arginine and interfacial polycondensation can serve as a good platform for the effective taste masking of bitter actives.

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Section: Resultsmentioning

confidence: 99%

Taste Masking of Promethazine Hydrochloride Using l-Arginine Polyamide-Based Nanocapsules

et al. 2023

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“…Very recently, our group systematically investigated how the polar plasticizer glycerol affects the T g of amorphous PSMANa ionomers. 30 In that study, we first found that polar glycerol only slightly decreased the matrix T g of the ionomers because it affected the formation of ionic aggregates. Second, we proposed that the cluster T g could be estimated simply using the equation in which the amount of glycerol and the ion content of ionomers were expressed as variables.…”

Section: Introductionmentioning

confidence: 94%

“…This result differs from that observed for glycerolplasticized PSMANa ionomers, where addition of glycerol did not change the glassy modulus of the ionomer. 30 However, this difference is understandable: The glycerol goes into multiplets, the isolated entities of the ionomer, whereas the DOP goes into the hydrocarbon phase, which governs the bulk properties of the ionomer. Therefore, it is natural that the bulk properties of the polymer change to some extent as DOP is added.…”

Section: Mechanical Property Measurements and Morphological Experimentsmentioning

confidence: 99%

“…This is opposite to the results obtained when polar glycerol was added to the same ionomers, since the maximum content of glycerol without phase separation (short-dashed line) increased as the ionic characteristics of the ionomer increased (see Figure 12b). 30 Finally, the effects of the nonpolar DOP and the polar glycerol on the T g s of PSMANa ionomer are summarized as follows. The DOP does not enter multiplets, but enters between polymer chains in matrix and cluster regions, promoting chain mobility to reduce the T g,m and T g,c of the ionomer simultaneously.…”

Section: Mechanical Property Measurements and Morphological Experimentsmentioning

confidence: 99%

“…Very recently, our group systematically investigated how the polar plasticizer glycerol affects the T g of amorphous PSMANa ionomers 30 . In that study, we first found that polar glycerol only slightly decreased the matrix T g of the ionomers because it affected the formation of ionic aggregates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glass transition temperature of styrene‐based ionomer controlled over a very wide temperature range by nonpolar plasticizer content and ion content

Choi

Kim

2023

J of Applied Polymer Sci

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The plasticization effect by the addition of nonpolar bis(2‐ethylhexyl) phthalate (dioctyl phthalate) (DOP) on the glass transition temperatures (Tgs) of poly(styrene‐Na methacrylate) (PSMANa) ionomers was investigated. The matrix Tg (Tg,m) and cluster Tg (Tg,c) of the ionomers dropped linearly as the DOP content in the PSMANa ionomers enhanced, only when the phase separation of DOP did not occur. Since the Tg,m and Tg,c of the ionomer increased somewhat linearly with increasing ion content of the ionomer, simple equations were obtained to express the Tgs of the ionomers using the ion contents (x mol%) and the DOP contents (y wt%) of the ionomers; Tg,m (°C) = 121 + 3.0x + 2.8y and Tg,c (°C) = 171 + 6.3x + 2.6y. According to the x‐ray scattering results, for the ionomer containing 6.4 mol% of ions, the distance between scattering centers increased from 21 to 22 Å when ca. 40 wt% of DOP was added. This suggested that the DOP promoted the mobility of the styrene chains, enhancing the formation of multiplets. On the other hand, for the ionomer containing 22.4 mol% of ions, when ca. 40 wt% was added, the distance between multiplets widened from 18 to 21 Å.

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A review of electro-active shape memory polymer composites: Materials engineering strategies for shape memory enhancement

Hassan,

Hallez,

Thielemans

et al. 2024

European Polymer Journal

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Relation between the amount of glycerol, glass transition temperature, and ion content of styrene-methacrylate ionomers

Cited by 4 publications

References 46 publications

Taste Masking of Promethazine Hydrochloride Using l-Arginine Polyamide-Based Nanocapsules

Taste Masking of Promethazine Hydrochloride Using l-Arginine Polyamide-Based Nanocapsules

Glass transition temperature of styrene‐based ionomer controlled over a very wide temperature range by nonpolar plasticizer content and ion content

A review of electro-active shape memory polymer composites: Materials engineering strategies for shape memory enhancement

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