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| 21. |
Determination of the elastic modulus of polyamide crystals along the chain axis by x‐ray diffraction, 1. The α‐form of nylon‐6 |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 209-217
Keisuke Kaji,
Ichiro Sakurada,
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摘要:
AbstractStudies were carried out to determine the crystalline elastic modulusE1along the chain axis for the α‐form of nylon‐6 [poly(ε‐caprolactam)] by X‐ray diffraction. To obtain an inherentE1value of this polymer the problem was solved that different orders of meridional reflections give differentE1values. Thus the disagreement was found to be due to the increase of the crystallite size by the applied stress. When corrected for this effect, the values from the 040 and 0.14.0 reflections agreed well with each other. The resulting modulus was 183 GN/m2at 23°C, which was much lower than a theoretically calculated value of 262,8 GN/m2for the fully extended structure model byManleyandMartin.This seems to be due to the slight shortening at the amide group of the molecular chain because it was confirmed from the intensity changes of the 040 and 0.14.0 reflections of this polymer by the applied stress that the amide part is more extensible than the polymethylene section.Judging from similar considerations the previously reportedE1values for nylon‐66 and nylon‐
ISSN:0025-116X
DOI:10.1002/macp.1978.021790121
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 22. |
Kinetische und morphologische Untersuchungen zur polymerisation von oxacyclischen Monomeren im festen Zustand, 1. Zur Morphologie der bei der Polymerisation von 1,3,5,7‐Tetroxocan mittels chemischer Katalysatoren entstehenden Polyoxymethylene |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 219-230
Antonio Muñoz‐Escalona,
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摘要:
AbstractIn order to elucidate the reaction mechanism of the chemically induced solid‐state polymerization of 1,3,5,7‐tetroxocane, the nascent morphology of poly(oxymethylene), (POM) crystals was investigated. The results show that POM has a lamellar morphology consisting of folded polymer chains. This morphology is different from that of the fibrous morphology obtained by radiation induced solid‐state polymerization of 1,3,5,7‐tetroxocane. Based on this the reaction takes place according to a crystallization succeeding polymerization mechanism, where the monomer passes through the gasphase to reach the reaction
ISSN:0025-116X
DOI:10.1002/macp.1978.021790122
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 23. |
Influence of nucleating agents on the crystallization of 6‐polyamide |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 231-245
Giorgio Gurato,
Dino Gaidano,
Roberto Zannetti,
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摘要:
AbstractThe influence of two nucleating agents on the crystallization parameters of 6‐Polyamide was investigated by differential scanning calorimetry and some substantial differences for the crystallization rate of the examined polymers were determined. The induction timesti, the semicrystallization timest1/2, the crystallization rate constantsk, and theAvrami ncoefficients were measured and related to the different characteristics and morphology of the specimens. The experimental data are represented in form of various plots and the microscopic examination of thin sections of the polymers allows to extend the study, showing remarkable differences in specimens morphology in correspondence of the nucleation effec
ISSN:0025-116X
DOI:10.1002/macp.1978.021790123
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 24. |
13C NMR sequence analysis, 13.Cis/trans‐isomerism of poly‐D,L‐proline |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 247-252
Hans R. Kricheldorf,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790124
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 25. |
The ring‐opening polymerization of three cycloalkenes: Random and blocky distribution ofcisandtransdouble bonds in the chains |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 253-258
Kenneth J. Ivin,
D. Theodore Laverty,
John J. Rooney,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790125
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 26. |
Chain transfer mechanism of 1,4‐dimethyl‐1,4‐diaryl‐2‐tetrazenes |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 259-263
Kazuo Sugiyama,
Tetsuo Tabuchi,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790126
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 27. |
Kinetics of the reaction of poly‐α‐methylstyryl sodium, potassium, and caesium withtert‐butyl chloride in dioxane and tetrahydrofuran |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 265-268
Henry Anthony Ellis,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790127
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 28. |
Initiation of nylon 6.6 phototendering by the piperidinoanthraquinones |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 269-271
N. S. Allen,
D. Wilson,
J. F. McKellar,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790128
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 29. |
Model considerations and examples of enantiotropic liquid crystalline polymers. Polyreactions in ordered systems, 14 |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 273-276
Heino Finkelmann,
Helmut Ringsdorf,
Joachim H. Wendorff,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790129
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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| 30. |
Über die massenspektrometrische Bestimmung des Einbauverhältnisses in Copolymeren, 2. Copolyester der Milchsäure und Glykolsäure |
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Die Makromolekulare Chemie,
Volume 179,
Issue 1,
1978,
Page 277-280
Erhard Jacobi,
Ingo Lüderwald,
Rolf C. Schulz,
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ISSN:0025-116X
DOI:10.1002/macp.1978.021790130
出版商:Hüthig&Wepf Verlag
年代:1978
数据来源: WILEY
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