ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Springer  (736)
  • Wiley-Blackwell  (180)
  • American Association for the Advancement of Science  (137)
  • 1950-1954  (1,053)
  • 1
    Electronic Resource
    Electronic Resource
    Macromolecular compounds (1952)
    Springer
    Russian chemical bulletin 1 (1952), S. 193-197 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The kinetics of the acidolysis reaction of ethyl stearate with succinic and adipic acids have been investigated at 122, 168, 183, and 250°. 2. It is shown that the reaction of acidolysis by dicarboxylic acids may proceed even without a catalyst; however, sulfuric acid considerably increases the reaction rate. 3. It has been found that the molar ratio of ester and dicarboxylic acid taken has an effect on the percent conversion of the acid during acidolysis. The higher this ratio, the further the reaction goes. 4. It is shown that the acidolysis reaction is of great importance in the polyesterification process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176589
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The natural sorbents of the Far East (1952)
    Springer
    Russian chemical bulletin 1 (1952), S. 395-397 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. Electron-microscopic. investigation of natural sorbents has permitted qualitative observations to be made concerning the character of the subdivision of the basic material composing the mineral, has enabled certain quantitative ideas concerning the dimensions of the particles, i.e. the degree of dispersion, to be obtained, and, in conjunction with knowledge of the chemical composition and with the thermal analysis, has, in many cases, indicated the basis mineral formations composing the given natural sorbent. For monomineral material, the mineralogical composition can be very readily determined. 2. Further work must be directed to the development of a procedure for separating polymineral substances into their separate components, which must be compared with standard samples of monomineral substances (kaolinite, halloysite, montmorillonite, etc.) of definite composition and structure in order to give a quantitative idea of the mineralogical composition of the natural sorbent under investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171986
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Macromolecular compounds Communication 63. Effect on the properties of polyesters of the introduction of ether oxygens and side chains (1954)
    Springer
    Russian chemical bulletin 3 (1954), S. 957-961 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. Some polyesters formed by diethylene glycol, triethylene glycol, and 1,2-propanediol with dicarboxylic acids have been prepared. 2. The effect of the structures of the starting substances on the melting points and solubilities of the resulting polyesters has been discussed. 3. It has been shown that the introduction of a methyl side group into a polyester molecule produces an effect similar to that of the introduction of three or four ether linkages, the crystallinity of the polymer being greatly reduced, its melting point lowered, and its solubility raised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168183
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Macromolecular compounds communication 61. Decarboxylation of dicarboxylic acids during polycondensation (1954)
    Springer
    Russian chemical bulletin 3 (1954), S. 461-466 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A study has been made of the effect of temperature on the polycondensation of ethylene glycol with oxalic, malonic, succinic, adipic, and sebacic acids. 2. It has been found that in presence of ethylene glycol the process of decarboxylation is greatly accelerated, and as a result no polyester is formed at ail in the case of oxalic and malonic acids, and in the case of succinic and adipic acids the molecular weight of the resulting polyester falls as the reaction temperature rims. 3. It has been found that in presence of glycols the decarboxylation temperatures of dicarboxylic acids are greatly lowered. 4. It has been established that the evolution of carbon dioxide results from the breakdown of the terminal carboxyl groups of the polyester molecule. 5. It has been shown that the breakdown of terminal carboxyl groups hinders the normal course of the polycondensation and leads to the formation of polyesters of lower molecular weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01167826
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Macromolecular compounds Communication 57. Properties of polyesters formed by dicarboxylic acids with some polymethylene glycols (1954)
    Springer
    Russian chemical bulletin 3 (1954), S. 949-955 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The polyesters formed by ethyleen glycol, 1,6-hexanediol, and 1,10-decanediol with the following dicarboxylic acids have been prepared under identical conditions: oxalic, malonic, succinic, glutaric, adipic, pimpelic, suberic, azelaic, and sebacic acids. 2. Polyesters derived from dicarboxylic acdis having even numbers of carbon atoms have higher melting points than the neighboring pairs of odd-acid polyesters. 3. The solubilities of the polyesters in benzene and alcohol have been determined, and it has been found that the polyesters of the odd dicarboxylic acids have the higher solubilities in alcohol. 4. An explanation has been advanced for the way in which the properties of the polyesters depend on their structures. 5. It has been established that the melting points of polyesters depend not only on the number of methylene groups in the repeating unit, but also on their distribution within the unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168182
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Macromolecular compounds. Communication 61. Reaction of polyester macromolecules (1954)
    Springer
    Russian chemical bulletin 3 (1954), S. 311-313 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A study has been made of- reactions in three mixtures, each containing two polyesters having different and groups. Three polyester components, having carboxyl, hydroxyl, and ethoxyl end groups respectively, are used. 2. It has been found that the polyester having hydroxyl end groups.reacts with the polyesters having carboxyl and ethoxyl end groups. 3. It has been found that the polyester having carboxyl end groups does not react with the polyester having ethoxyl end groups. 4. It has been shown that a decisive factor for the occurrence of polycondensation is the volatility of the low-molecular-weight product that separates: high volatility leads to a displacement of the equilibrium to the right and so to the growth of the polymer molecules. 5. It has been shown that macromolecules have fairly high reactivities, so that they are capable of undergoing the same reactions as the monomers are.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177629
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Macromolecular compounds Communication 51. Investigation of the polyester exchange reaction by the use of deuterium (1953)
    Springer
    Russian chemical bulletin 2 (1953), S. 125-128 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. An investigation has been made of exchange reaction between polyhexamethylene sebacate and diethyl succinate-2,3-dg. 2. It has been proved that exchange reactions involving ester linkages occur during the course of the polyesterification process. 3. A convenient method has been developed for the preparation of diethyl succinate-2,3-dg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188246
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Macromolecular compounds Communication 62 [1]. Polycondensation of acid esters of adipic acid with various glycols (1953)
    Springer
    Russian chemical bulletin 2 (1953), S. 847-850 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A study has been made of the polycondensation of acid adipic esters of glycols, namely, the acid diadipic esters of ethylene glycol and of 1,20-eicosanediol. 2. It has been shown that acid esters of glycols are able to undergo polycondensation and form m polyesters. 3. It has been shown that in the polyesterification process the growth of the polyester chain occurs not only on account of reaction between terminal groups (direct esterification), but also on account of transesterification processes (alcoholysis and acidolysis). 4. A scheme has been proposed for the synthetic reactions occurring in the polyesterification process. 5. Acid esters of adipic acid - diadipic esters of ethylene glycol and of 1,20-eicosanediol - have been prepared
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178864
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Macromolecular compounds (1952)
    Springer
    Russian chemical bulletin 1 (1952), S. 509-515 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A method has been developed for the determination of the thernal stability and decomposition kinetics for organic carboxylic acids. 2. The decarboxylation temperatures have been determined for oxalic, malonic, succinic, glutaric, adipic, suberic, azelaic, and sebacic acids. 3. It has been found that dicarboxylic acids having an odd number of carbon atoms decompose at lower temperatures than acids having an even number of carbon atoms. 4. It has been shown that the thermal stability of the acid increases as we proceed from the lower t the higher members of the homologous series of dicarboxylic acids. 5. It has been shown that decarboxylation of dicarboxylic acids must play a considerable inhibiting role in the course of the polycondensation of these acids with bifunctional substances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172006
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    High-molecular compounds Part 52. Reactions of polyester macromolecules with each other (1952)
    Springer
    Russian chemical bulletin 1 (1952), S. 967-971 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. A study of the exchange reaction between polyesters of different molecular weight shows that they react to give a single polyester. 2. The low-molecular polyester acts as a degradative agent with respect to the high-molecular ester. 3. The extent of degradation of the high-molecular polyester is proportional to the content of the low-molecular polyester in the mixture. 4. The polydispersity coefficient falls during heating of polyester mixtures as a result of the degradative reaction. 5. A study of the kinetics of degradation of high-molecular polyesters when heated with low-molecular polyesters shows that the polydispersity coefficient falls regularly as the reaction proceeds. 6. A study has been made of the thermal degradation of polyesters at various temperatures. 7. The exchange reaction is shown to be of considerable significance for the process of polycondensation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172356
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...