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Поисковый запрос: (<.>K=POLYMER<.>)
Общее количество найденных документов : 26
Показаны документы с 1 по 10
 1-10    11-20   21-26 
1.
Инвентарный номер: нет.
   
   P 34


    Pavlov, P. A.
    Vaporization in Polymer Liquids under Conditions of Rapid Heating [] / P. A. Pavlov, P. V. Skripov // High Temperature. - 1998. - V.36, N3. - С. 448-455
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
VAPORIZATION -- LIQUID POLYMER -- HEATING RAPID -- POLYMER

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2.
Инвентарный номер: нет.
   
   P 34


    Pavlov, P. A.
    Vaporization in Polymer Liquids under Conditions of Rapid Heating [] / P. A. Pavlov, P. V. Skripov // High Temperature. - 1998. - V.36, N3. - С. 448-455
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
VAPORIZATION -- LIQUID POLYMER -- HEATING RAPID -- POLYMER

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3.
Инвентарный номер: нет.
   
   N 64


    Nikitin, E. D.
    Using the phenomenon of liquid superheat to measure critical properties of substances / E. D. Nikitin, A. P. Popov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 200-204
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL TEMPERATURES -- R1(CH2)nR2
Аннотация: A method to measure the critical temperature and critical pressure of substances, in particular, thermally unstable ones, is briefly described. The method is used to measure the temperature of attainable superheat of liquids with the help of a wire probe heated by electric current pulses. As the pressure increases, the temperature of attainable superheat tends to a critical temperature. The duration of the heating pulses is from 0.03 to 1 ms. A list of about 130 substances for which measurements of the critical properties were made is presented. The results of these measurements confirmed the scaling form of the relation between the critical constants of substances consisting of long chain molecules and the number of molecular units. Two methods to extrapolate the experimental data for the critical properties of the initial members of homologous series to heavier polymer homologs are proposed. One of the methods is based on the equation of state for the fluid of chain molecules. In this method, the extrapolating equations are power series in n, where n is the number of main units in a chain molecule. In the other method, the hypothesis of functional self-similarity and the presentation of scaling behavior of the critical constants of long chain molecules are used. Homologous series with the general formula R1 (CH2)nR2, where R1 and R2 are different end groups, are considered. We obtain equations to calculate, with good accuracy, the critical temperature and critical pressure of any member of any homologous series with the molecule structure R1(CH2)nR2 if they are known for one compound belonging to this series

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4.
Инвентарный номер: нет.
   
   N 64


    Nikitin, E. D.
    Using the phenomenon of liquid superheat to measure critical properties of substances / E. D. Nikitin, A. P. Popov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 200-204
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL TEMPERATURES -- R1(CH2)nR2
Аннотация: A method to measure the critical temperature and critical pressure of substances, in particular, thermally unstable ones, is briefly described. The method is used to measure the temperature of attainable superheat of liquids with the help of a wire probe heated by electric current pulses. As the pressure increases, the temperature of attainable superheat tends to a critical temperature. The duration of the heating pulses is from 0.03 to 1 ms. A list of about 130 substances for which measurements of the critical properties were made is presented. The results of these measurements confirmed the scaling form of the relation between the critical constants of substances consisting of long chain molecules and the number of molecular units. Two methods to extrapolate the experimental data for the critical properties of the initial members of homologous series to heavier polymer homologs are proposed. One of the methods is based on the equation of state for the fluid of chain molecules. In this method, the extrapolating equations are power series in n, where n is the number of main units in a chain molecule. In the other method, the hypothesis of functional self-similarity and the presentation of scaling behavior of the critical constants of long chain molecules are used. Homologous series with the general formula R1 (CH2)nR2, where R1 and R2 are different end groups, are considered. We obtain equations to calculate, with good accuracy, the critical temperature and critical pressure of any member of any homologous series with the molecule structure R1(CH2)nR2 if they are known for one compound belonging to this series

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5.
Инвентарный номер: нет.
   
   B 65


    Blednykh, Ye. I.
    Thermodynamic and Structural Conditions of Bubbles Nucleation in Gas-Saturated Polymethyl Methacrylate [] / Ye. I. Blednykh, V. P. Skripov // Polymer Science. Series B. - 1992. - V.34, N9. - С. 61-65
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMODYNAMIC CONDITIONS OF NUCLEATION -- STRUCTURAL CONDITIONS OF NUCLEATION -- NUCLEATION BUBBLES -- POLYMETHYL METHACRYLATE GAS-SATURATED -- NUCLEATION HOMOGENEOUS -- CARBON DIOXIDE -- LIMIT GAS-POLYMER

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6.
Инвентарный номер: нет.
   
   B 65


    Blednykh, Ye. I.
    Thermodynamic and Structural Conditions of Bubbles Nucleation in Gas-Saturated Polymethyl Methacrylate [] / Ye. I. Blednykh, V. P. Skripov // Polymer Science. Series B. - 1992. - V.34, N9. - С. 61-65
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMODYNAMIC CONDITIONS OF NUCLEATION -- STRUCTURAL CONDITIONS OF NUCLEATION -- NUCLEATION BUBBLES -- POLYMETHYL METHACRYLATE GAS-SATURATED -- NUCLEATION HOMOGENEOUS -- CARBON DIOXIDE -- LIMIT GAS-POLYMER

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7.
Инвентарный номер: нет.
   
   S 66


    Skripov, P. V.
    Superheat and Spontaneous Boiling of Polymer Solutions [] / P. V. Skripov, S. E. Puchinscics // Polymer Science. Series A. - 1995. - V.37, N2. - С. 283-290
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING SPONTANEOUS -- BOILING SPONTANEOUS -- SOLUTION POLYMER -- DEPENDENCE OF TEMPERATURE

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8.
Инвентарный номер: нет.
   
   S 66


    Skripov, P. V.
    Superheat and Spontaneous Boiling of Polymer Solutions [] / P. V. Skripov, S. E. Puchinscics // Polymer Science. Series A. - 1995. - V.37, N2. - С. 283-290
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
BOILING SPONTANEOUS -- BOILING SPONTANEOUS -- SOLUTION POLYMER -- DEPENDENCE OF TEMPERATURE

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9.
Инвентарный номер: нет.
   
   S 66


    Skripov, V. P.
    Spontaneous boiling up as a specific relaxation process in polymer solvent systems [Text] / V. P. Skripov, S. E. Puchinscics // Journal of Applied Polymer Science. - 1996. - V. 59, №11. - P1659-1665
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
КИПЕНИЕ СПОНТАННОЕ -- СПОНТАННОЕ КИПЕНИЕ -- ПРОЦЕСС СПЕЦИАЛЬНЫЙ -- СПЕЦИАЛЬНЫЙ ПРОЦЕСС -- ПРОЦЕСС ОСЛАБЛЕННЫЙ -- ОСЛАБЛЕННЫЙ ПРОЦЕСС -- СИСТЕМА ПОЛИМЕРНАЯ -- ПОЛИМЕРНАЯ СИСТЕМА -- СИСТЕМА РАСТВОРЯЮЩАЯСЯ -- РАСТВОРЯЮЩАЯСЯ СИСТЕМА
Аннотация: The phenomenon of spontaneous bubble nucleation in extremely supersaturated (superheated) polymer–solvent systems has been studied experimentally. Spontaneous boiling-up temperatures T* for polystyrene and poly(ethylene glycol) solutions in a number of solvents have been measured at different values of pressure p and weight fraction of polymer c by the pulse heating method. The heating rate Ṫ varied from 105 to 107 K/s. For all systems studied, the values of T* have been found to increase with increasing p and c. The T*(p, c) dependence is discussed with the use of the data on the degree of compatibility of components. The peculiarities of polymeric solutions manifest themselves in the region c → 1, as follows: (i) an abrupt increase (by 1–2 orders of magnitude) in the slope of the T*(c) dependence, and (ii) the appearance of the dependence of T* values on the heating rate. Our approach to the interpretation of this result assumes a change in the initial composition of a solution in the course of heating due to polymer decomposition. An example of the extended phase diagram of a polymer–solvent system including the kinetic surface of T*(p, c) is given

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10.
Инвентарный номер: нет.
   
   S 66


    Skripov, V. P.
    Spontaneous boiling up as a specific relaxation process in polymer solvent systems [Text] / V. P. Skripov, S. E. Puchinscics // Journal of Applied Polymer Science. - 1996. - V. 59, №11. - P1659-1665
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
КИПЕНИЕ СПОНТАННОЕ -- СПОНТАННОЕ КИПЕНИЕ -- ПРОЦЕСС СПЕЦИАЛЬНЫЙ -- СПЕЦИАЛЬНЫЙ ПРОЦЕСС -- ПРОЦЕСС ОСЛАБЛЕННЫЙ -- ОСЛАБЛЕННЫЙ ПРОЦЕСС -- СИСТЕМА ПОЛИМЕРНАЯ -- ПОЛИМЕРНАЯ СИСТЕМА -- СИСТЕМА РАСТВОРЯЮЩАЯСЯ -- РАСТВОРЯЮЩАЯСЯ СИСТЕМА
Аннотация: The phenomenon of spontaneous bubble nucleation in extremely supersaturated (superheated) polymer–solvent systems has been studied experimentally. Spontaneous boiling-up temperatures T* for polystyrene and poly(ethylene glycol) solutions in a number of solvents have been measured at different values of pressure p and weight fraction of polymer c by the pulse heating method. The heating rate Ṫ varied from 105 to 107 K/s. For all systems studied, the values of T* have been found to increase with increasing p and c. The T*(p, c) dependence is discussed with the use of the data on the degree of compatibility of components. The peculiarities of polymeric solutions manifest themselves in the region c → 1, as follows: (i) an abrupt increase (by 1–2 orders of magnitude) in the slope of the T*(c) dependence, and (ii) the appearance of the dependence of T* values on the heating rate. Our approach to the interpretation of this result assumes a change in the initial composition of a solution in the course of heating due to polymer decomposition. An example of the extended phase diagram of a polymer–solvent system including the kinetic surface of T*(p, c) is given

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 1-10    11-20   21-26 
 

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