Relationship between hydrogen bonding and bound water in polyhydroxystyrene derivatives

Nakamura, Kunio; Hatakeyama, T.; Hatakeyama, Hyōe

doi:10.1016/0032-3861(83)90206-9

Cited by 214 publications

(110 citation statements)

References 18 publications

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“…In addition, as previously noted by Norinaga et al [3], a small peak at -90 o C was also shown by the curve of raw DT lignite in the Fig.1a, which was defined as bound water according to the study of Nakamura et al [7]. Contrasting curve 2, 3 and 4, it was shown that the bound water did not start to be separated out until the free water fully evaporated.…”

Section: Resultssupporting

confidence: 68%

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Study on the Water in Lignite by DSC

Zhang

Zhao

et al. 2017

MATEC Web Conf.

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Abstract. As pointed out in several previous works, new drying technologies must be developed to ensure lignite remained competitive. In order to design and test them, it was needed to have a better understanding of the characters of water in lignite. Using differential scanning calorimetry (DSC), three types of the water storing in the lignite were determined from congelation character. The contents of the free water and bound water were experimentally measured from their heats of congelation, respectively. The results shows that the congelation temperature and the freezing heat per weight unit of the bound water vary in different types of lignite. It is deduced that the bound water in lignite can reflect the character of lignite. Besides, the total water content of free water and bound water is less than that measured by fully drying at 105 o C. Therefore, it is deduced that there is a kind of water not frozen in the lignite, possibly because its molecular cluster is too small.

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Section: Resultssupporting

confidence: 68%

“…), ∆H decreased with a slope of 188 J/g of water, which was considered as bound water [7]. As it was analyzed previously, the congelation heat of capillary-condensed water was generally less than that of free water [8].…”

Section: Resultsmentioning

confidence: 82%

Study on the Water in Lignite by DSC

Zhang

Zhao

et al. 2017

MATEC Web Conf.

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“…Absorbed water may also break hydrogen bonds within the resin matrix and bound to polymer hydroxyl groups. 29 Such interactions with the resin matrix can result in a decreased modulus which is a measure of the stiffness of a given material. 30 Water, which has entered the polymer through sorption, can also cause hydrolytic degradation of the resin matrix, the filler/matrix interface, or the filler.…”

Section: 18mentioning

confidence: 99%

Accelerated Aging Effects on Surface Hardness and Roughness of Lingual Retainer Adhesives

Ramoğlu

Üşümez²,

Büyükyılmaz

2008

The Angle Orthodontist

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Objective: To test the null hypothesis that accelerated aging has no effect on the surface microhardness and roughness of two light-cured lingual retainer adhesives. Materials and Methods: Ten samples of light-cured materials, Transbond Lingual Retainer (3M Unitek) and Light Cure Retainer (Reliance) were cured with a halogen light for 40 seconds. Vickers hardness and surface roughness were measured before and after accelerated aging of 300 hours in a weathering tester. Differences between mean values were analyzed for statistical significance using a t-test. The level of statistical significance was set at P Ͻ .05. Results:The mean Vickers hardness of Transbond Lingual Retainer was 62.8 Ϯ 3.5 and 79.6 Ϯ 4.9 before and after aging, respectively. The mean Vickers hardness of Light Cure Retainer was 40.3 Ϯ 2.6 and 58.3 Ϯ 4.3 before and after aging, respectively. Differences in both groups were statistically significant (P Ͻ .001). Following aging, mean surface roughness was changed from 0.039 m to 0.121 m and from 0.021 m to 0.031 m for Transbond Lingual Retainer and Light Cure Retainer, respectively. The roughening of Transbond Lingual Retainer with aging was statistically significant (P Ͻ .05), while the change in the surface roughness of Light Cure Retainer was not (P Ͼ .05). Conclusions: Accelerated aging significantly increased the surface microhardness of both lightcured retainer adhesives tested. It also significantly increased the surface roughness of the Transbond Lingual Retainer.

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“…Free water and non-freezing water are the two extremes of the continuum water 'states' in a hydrogel [1]. Free or freezing water is defined as the water which has the same phase transition temperature as bulk water [2]. Freezable bound water is the water having a phase transition temperature lower than 273 K. This depression is usually ascribed to the weak interaction of the water with the polymer chains and/or the capillary condensation in the hydrogel [3,4].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of water in reinforced plasma-polymerised poly(2-hydroxyethyl acrylate) hydrogels

Serrano‐Aroca

Pradas

Ribelles

et al. 2015

European Polymer Journal

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ElsevierSerrano Aroca, A.; Monleón Pradas, M.; Gómez Ribelles, JL.; Rault, J. (2015). Thermal analysis of water in reinforced plasma-polymerised poly(2-hydroxyethyl acrylate) hydrogels. European Polymer Journal. 72:523-534. AbstractThermal analysis of water in reinforce hydrogels of plasma-polymerised poly(2-hydroxyethyl acrylate) (plPHEA) grafted onto macroporous poly(methyl methacrylate) (PMMA) are explained in a simple thermodynamic framework based on the transition diagram. Water in bulk PHEA was also analysed for comparison with plPHEA. These two hydrophilic polymers were prepared with a broad range of water mass fractions from 0.05 to 0.72. Thermal transition diagrams of water/PHEA and water/plPHEA were determined showing less undercooling of water crystallisation in plPHEA than in PHEA. Kinetics of water crystallisation for high and low water contents were studied in both hydrophilic systems following several thermal treatments.Water crystallises much faster in plPHEA than in PHEA for high water contents. For low water contents, crystallisation becomes possible holding at -30ºC for some time due to water segregation in both PHEA systems. However, much less water is segregated from the water/plPHEA mixture due to the influence of the hydrophobic component.

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Relationship between hydrogen bonding and bound water in polyhydroxystyrene derivatives

Cited by 214 publications

References 18 publications

Study on the Water in Lignite by DSC

Study on the Water in Lignite by DSC

Accelerated Aging Effects on Surface Hardness and Roughness of Lingual Retainer Adhesives

Thermal analysis of water in reinforced plasma-polymerised poly(2-hydroxyethyl acrylate) hydrogels

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