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  • 1
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    Physikalisch-chemische Untersuchungen am System Natriumbenzoat/Benzoesäure (I) Infrarotspektropische und röntgenografische Untersuchungen bei Raumtemperatur (1974)
    Wiley
    Details
    Publication Date: 1974-01-01
    Print ISSN: 0023-4753
    Topics: Geosciences , Physics
    Published by Wiley
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  • 2
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    Physikalisch-chemische Untersuchungen am System Natriumbenzoat/Benzoesäure (III) Untersuchungen an der Tieftemperaturmodifikation des Komplexes 1 Natriumbenzoat · 2 Benzoesäure (1974)
    Wiley
    Details
    Publication Date: 1974-01-01
    Print ISSN: 0023-4753
    Topics: Geosciences , Physics
    Published by Wiley
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal properties of acetamide in the temperature range from 298 K to 400 K
    Amsterdam : Elsevier
    Thermochimica Acta 104 (1986), S. 127-137 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(86)85191-7
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of thermally activated or photoinitiated polymerization by DSC (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 55-65 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Differential-Scanning-Kalorimetrie (DSC) gehört ohne Zweifel zu den leistungsfähigsten Methoden der Untersuchung von Bildungsreaktionen thermoplastischer und thermisch härtbarer Substanzen. Die Bedingungen zur Gewinnung zuverlässiger experimenteller Ergebnisse werden zusammengestellt. Für die Härtung von Epoxid-Amin-Systemen wird ein Mechanismus vorgeschlagen, der das Verhalten stöchiometrischer und nichtstöchiometrischer Mischungen bis zu hohen Umsätzen beschreiben kann. Die Vorzüge der Kopplung eines DSC-Instruments mit einer Einrichtung für die photochemische Aktivierung von Polymerisationen wird an einigen Beispielen demonstriert.
    Abstract: Резуме Дифференциальная ск анирующая калоримет рия несомненно является одним из самых мощных методов иссле дования реакций полу чения термопластических и термореактивных материалов. Обобщены условия для получени я приемлемых эксперим ентальных результат ов. Предложен механизм о тверждения эпокси-ам ино систем, описывающий поведен ие стехиометрически х и нестехиометрическ их смесей до высоких с тепеней их превращения. На неско льких примерах показано преимущест во соединения ДСК апп аратуры с устройством для фото химической активации реакций по лимеризации.
    Notes: Abstract Differential scanning calorimetry is undoubtedly one of the most powerful techniques for investigating the reactions leading to thermoplastic or thermosetting materials. The conditions for the obtaining of reliable experimental results are summarized. A mechanism for the curing of epoxyamine systems is suggested, which is capable of describing the behaviour of stoichiometric and nonstoichiometric mixtures up to high reaction degrees. The advantage of coupling a DSC instrument with a device for the photochemical activation of polymerizations is demonstrated by some examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914584
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of two-step polymerization reactions by DSC (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 1159-1165 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die lichtinduzierte Thiol-en-Addition wurde mit der thermisch aktivierten Amin-Epoxid-Addition kombiniert. Der zweistufige Ablauf der Polymerisation in einem derartigen Harzsystem wurde mittels DSC nachgewiesen. Die Energien beider Teilschritte, der lichtinduzierten und der thermisch aktivierten Reaktion, wurden bestimmt.
    Abstract: РЕжУМЕ ИНИцИИРОВАННАь сВЕт ОМ тИОл — тИОлЕНОВАь РЕАкцИь пРИсОЕДИНЕН Иь БылА сВьжАНА с тЕРМИЧЕскИ АктИВИРО ВАННыМ АМИНО-ЁпОксИл пРИсОЕДИНЕНИЕМ. МЕтО ДОМ Дск ДОкАжАН ДВУхс тУпЕНЧАтыИ хАРАктЕР пОлИМЕРИжА цИИ ЁтОИ сМОлы. ОпРЕДЕ лЕНы ЁНЕРгИИ АктИВАцИИ ОБ ОИх РЕАкцИИ кАк ИНИцИИРОВАННОИ с ВЕтОМ, тАк И тЕРМИЧЕск И АктИВИРОВАННОИ.
    Notes: Abstract A light-induced thiol-ene addition was combined with a thermally activated amine-epoxide addition. The two-step character of the polymerization in this resin system was proved by DSC measurements. The energies of the light-activated and the thermally activated reactions were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912744
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  • 6
    Electronic Resource
    Electronic Resource
    Investigations of photopolymerization by means of intermittent illumination (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 1167-1169 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe einiger optischer Ergänzungsausrüstungen wurde ein DSC-2C (Perkin-Elmer) Gerät modifiziert, um Proben unterbrochen belichten zu können. Als Lichtunterbrecher diente eine Lochscheibe, die von einem computerkontrollierten Schrittmotor getrieben wurde. Die verschiedenen Frequenzen, die zu Untersuchungen dieser Art notwendig sind, werden softwaregestützt aus der quarzgesteuerten Uhrenfrequenz des Computers gewonnen. Zur Vereinfachung der Kommunikation mit dem System geschieht diese über die Perkin-Elmer Data Station.
    Abstract: РЕжУМЕ ОпИсАНА АппАРАтУРА Д ль пРЕРыВИстОгО ОсВЕЩЕНИь ОБРАжцА В п РИБОРЕ Дск-2с ФИРМы пЕРкИН-ЁльМЕР, ДОпОлН ЕННОгО сООтВЕтстВУУ ЩИМ ОптИЧЕскИМ ОБОРУДОВ АНИЕМ. В кАЧЕстВЕ пРЕР ыВАтЕль сВЕтА Был ИспОльжОВА Н сЕктОРНыИ ДИск, УпРА ВльЕМыИ шАгОВыМ МОтОРОМ. НЕОБ хОДИМыЕ сВЕтОВыЕ ЧАстОты Уст АНАВлИВАлИсь НА ОсНО ВЕ ЧАстОты кВАРцЕВых ЧАсОВ, пРОг РАММНО-УпРАВльЕМых с пОМОЩьУ ЁВМ. Дль БОлЕ Е пРОстОгО УпРАВлЕНИ ь АппАРАтУРОИ ВВЕДЕН Д ИАлОг ОпЕРАтОРА пОсРЕДстВОМ БАжОВых ДАННых ФИРМы пЕРкИН-Ё льМЕР.
    Notes: Abstract An apparatus is described for intermittent illumination of the sample in a DSC-2C (Perkin-Elmer) modified with some additional optical equipment. A slotted disk is used as a light chopper. This is driven by a computer-controlled stepping motor. The various frequencies needed for investigations of this kind are derived from a computer quartz-controlled clock frequency by means of software. The operator dialogue is achieved through the Perkin-Elmer Data Station to simplify the use of the equipment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912745
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  • 7
    Electronic Resource
    Electronic Resource
    DSC Investigations on a Commercial Photocuring Sheet Material (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 125-130 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; impression materials ; photopolymerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The photopolymerization of a commercial sheet material as used in the dental laboratory was investigated by using the photocalorimeter DSC7/DPA7 (Perkin-Elmer). Using normal reaction conditions (light wavelength ≤400 nm, light intensity ≥1 mW cm−2 and sample thickness ≤2.5 mm), the curing was completed within few min. The reaction rate was nearly independent on the light wavelength in the range between λ=300 and 380 nm, but decreased distinctively at longer wavelengths. After desmearing the DSC curves, the dependence of the reaction rate on light intensity and sample thickness could be described in very good approximation by an equation derived by Tryson [1]. Comparable with pure acrylates or methacrylates, a pronounced dark reaction was found after interruption of the illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010170408825
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  • 8
    Electronic Resource
    Electronic Resource
    The cis-trans Isomerization of Azobenzene in the Molten State: A useful test reaction for the kinetic evaluation of DSC measurements (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 177-185 
    Details
    ISSN: 1572-8943
    Keywords: azobenzene ; DSC ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Contrary to the situation in the field of temperature, heat and heat flow rate calibration, so far no generally accepted and easily practicable chemical reaction exists with regard to a kinetic evaluation. A possible reaction would be the well-known first-order cis-trans isomerization of subcooled liquid azobenzene. Surprisingly, the evaluation of measurements performed with a power compensated calorimeter yields activation parameters, which are dependent on the heating rate. The desmearing of the curves does not produce any improvements. However, constant activation parameters are obtained, if a small self-heating of the sample during the exothermic reaction is taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010178610642
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  • 9
    Electronic Resource
    Electronic Resource
    A simple and effective method for smoothing DSC curves (1991)
    Springer
    Journal of thermal analysis and calorimetry 37 (1991), S. 333-339 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In einigen Fällen (Bildung von Ableitungen, Entschmierungsrechnungen, Auswertung schwacher Effecte) ist auch bei der DSC-Technik eine Glättung des primären Signals angebracht. Alle bekannten Verfahren beinhalten immer einen Kompromiß zwischen erreichter Glättung und beginnender, nicht mehr zu vernachlässigender Verfälschung der Analysenergebnisse. Zudem erfordert jedes Problem seine eigenen optimalen Glättungsparameter. Wir schlagen eine einfache und universell anwendbare Modifikation des Verfahrens mit gleitender Mittelwertsbildung bzw. unter Verwendung der Golay-Sawitzky-Filter vor. In einem Streifen, der aus einem vorgebbaren Vielfachen der Standardabweichung des Rauschens gebildet wird, erhält man so eine optimale Glättung.
    Notes: Abstract All known procedures of smoothing are limited by the beginning of falsification of the signals. We suggest a simple modification of the moving average of the polynomial smoothing procedure. The signal curve is smoothed to the best degree and independently of the special problem within an interval calculated from then-th multiple of the standard deviation of the noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02055935
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  • 10
    Electronic Resource
    Electronic Resource
    Physikalisch-chemische Untersuchungen am System Natriumbenzoat/Benzoesäure (1975)
    Springer
    Journal of thermal analysis and calorimetry 7 (1975), S. 571-585 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié le système benzoate de sodium/acide benzoique par analyse calorimétrique différentielle et diffraction des rayons X à température variable. Les résultats obtenus ont permis d'établir le diagramme de phases entre la température ambiante et 250°C. De plus, les enthalpies de transformation de chacun des complexes 1NaBz · 2HBz et 2NaBz · 1HBz ont été déterminées. L'influence des conditions de la préparation ainsi que celle de l'histoire thermique des composés sont discutées.
    Abstract: Zusammenfassung Mittels der Differential Scanning Calorimetry und der temperaturabhängigen Röntgenbeugung wurde das Phasenverhalten des Systems Natriumbenzoat/Benzoesäure untersucht. Die erhaltenen Daten ermöglichten die Aufstellung des Phasendiagramms zwischen Raumtemperatur und 250°C. Gleichfalls wurden die Umwandlungsenthalpien zweier Formen einer 1NaBz · 2HBz-Verbindung und der 2NaBz · 1HBz-Verbindung bestimmt. Der Einfluß der Präparationsbedingungen und der thermischen Vergangenheit wird diskutiert.
    Notes: Abstract Differential scanning calorimetry and temperature-dependent X-ray diffraction were used to investigate the system sodium benzoate-benzoic acid. The results permit construction of the phase diagram between room temperature and 250°C. Moreover, the transformation energies of two forms of the 1NaBz · 2HBz complex and the one form of the 2NaBz · 1HBz complex were determined. The influence of the preparation conditions and thermal history is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912018
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