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Die Makromolekulare Chemie, Theory and Simulations最新文献

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Statics and dynamics of single chains in polymer blends and copolymer melts―results beyond the random phase approximation 聚合物共混物和共聚物熔体中单链的静力学和动力学——超出随机相近似的结果
Die Makromolekulare Chemie, Theory and Simulations Pub Date : 1900-01-01 DOI: 10.1002/MATS.1992.040010103
T. Vilgis, M. Benmouna
{"title":"Statics and dynamics of single chains in polymer blends and copolymer melts―results beyond the random phase approximation","authors":"T. Vilgis, M. Benmouna","doi":"10.1002/MATS.1992.040010103","DOIUrl":"https://doi.org/10.1002/MATS.1992.040010103","url":null,"abstract":"We present new results on the behaviour of single chains in homo-and copolymer blends which are beyond the rendom phase approximation (RPA). The radius of gyration of a chain in the blend was found to depend strongly on the interactions as well as the effective diffusion constant of a single chain in the blend or copolymer melt. Note that these results cannot be obtained in the original formulation of the RPA. They are based on the effective Hamiltonian of the chain in the medium. In the equation found for the self diffusion constant of a single chain, Ds, the second term is directly the value of the effective potential at zero wave vector. Thus the measurement of Ds would detect the screened potential at q = 0. Experimental verification of these results is in progress.","PeriodicalId":227512,"journal":{"name":"Die Makromolekulare Chemie, Theory and Simulations","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126866063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Anisotropy of local relaxation properties of macromolecules. Polarized luminescence 大分子局部弛豫性质的各向异性。偏振发光
Die Makromolekulare Chemie, Theory and Simulations Pub Date : 1900-01-01 DOI: 10.1002/MATS.1993.040020101
Y. Gotlib, I. Neelov, I. A. Torchinski, V. Shevelev
{"title":"Anisotropy of local relaxation properties of macromolecules. Polarized luminescence","authors":"Y. Gotlib, I. Neelov, I. A. Torchinski, V. Shevelev","doi":"10.1002/MATS.1993.040020101","DOIUrl":"https://doi.org/10.1002/MATS.1993.040020101","url":null,"abstract":"A tetrahedral lattice model for a polymer chain with three-unit kinetic elements was used to find the correlation functions which describe the local dynamics of unit vectors oriented in the longitudinal or transverse directions with respect to the chain. These unit vectors can represent the dynamics of the emitting oscillator of the marker. It is shown that the spectra for longitudinal and transverse components of the emitting oscillator differ greatly. It is also shown that at short relaxation times the anisotropy of local relaxation properties of a kinetic chain fragment may be described by an equivalent ellipsoid with an axes ratio of ca. 10.","PeriodicalId":227512,"journal":{"name":"Die Makromolekulare Chemie, Theory and Simulations","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125163747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Wetting transitions of asymmetric binary polymer mixtures 非对称二元聚合物混合物的润湿转变
Die Makromolekulare Chemie, Theory and Simulations Pub Date : 1900-01-01 DOI: 10.1002/MATS.1992.040010104
Zhengxiu Chen, J. Noolandi
{"title":"Wetting transitions of asymmetric binary polymer mixtures","authors":"Zhengxiu Chen, J. Noolandi","doi":"10.1002/MATS.1992.040010104","DOIUrl":"https://doi.org/10.1002/MATS.1992.040010104","url":null,"abstract":"We examine the effect on surface-wetting phase transitions in polymer mixtures when the degrees of polymerization of the two components are different. It has been demonstrated by Schmidt and Binder (J. Phys. (Paris)46, 1631 (1985)) that in a symmetric polymer mixture a second-order wetting transition occurs if the wall-polymer interaction f(ϕ0) has a negative curvature f″(ϕ0), where ϕ0 is the surface volume fraction of the polymer component preferred by the wall. We found that in an asymmetric mixture this is not necessarily the case.","PeriodicalId":227512,"journal":{"name":"Die Makromolekulare Chemie, Theory and Simulations","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126525796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Conformational structure of liquid-crystalline polyesters with mesogens and spacers in the main chain† 主链中含有介生和间隔剂的液晶聚酯的构象结构
Die Makromolekulare Chemie, Theory and Simulations Pub Date : 1900-01-01 DOI: 10.1002/MATS.1993.040020103
S. Shilov, T. Birshtein, B. Z. Volchek
{"title":"Conformational structure of liquid-crystalline polyesters with mesogens and spacers in the main chain†","authors":"S. Shilov, T. Birshtein, B. Z. Volchek","doi":"10.1002/MATS.1993.040020103","DOIUrl":"https://doi.org/10.1002/MATS.1993.040020103","url":null,"abstract":"The conformations of thermotropic polyesters with alternating mesogens and poly(methylene) spacers in the main chain were investigated by conformational calculations using the data of linear-dichroism IR-spectroscopy, X-ray analysis and differential scanning calorimetry. The conformations of monomeric units and of the macromolecules as a whole in different phase-aggregated states were estimated. It is shown that in the liquid-crystalline (LC) state the polymer chains are strongly extended. The results are compared with the data of various theories of LC ordering.","PeriodicalId":227512,"journal":{"name":"Die Makromolekulare Chemie, Theory and Simulations","volume":"334 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"119759251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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