Journal of Polymer Science. Part B, Polymer Physics最新文献

{"title":"Linear poly(etheraroylhydrazides): A correlation between number of methylene sequences and reticular structure","authors":"G. Gentile, P. Laurienzo, F. Riva, M. G. Volpe","doi":"10.1002/(SICI)1099-0488(19970930)35:13<2193::AID-POLB19>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/(SICI)1099-0488(19970930)35:13<2193::AID-POLB19>3.0.CO;2-#","url":null,"abstract":"","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"74 1","pages":"2193-2194"},"PeriodicalIF":0.0,"publicationDate":"1997-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85648273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic mechanical behavior of fluorinated aromatic poly(ethers)","authors":"A. A. Goodwin, F. Mercer","doi":"10.1002/(SICI)1099-0488(19970915)35:12<1963::AID-POLB11>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/(SICI)1099-0488(19970915)35:12<1963::AID-POLB11>3.0.CO;2-#","url":null,"abstract":"The relaxation behavior of six fluorinated aromatic poly( ethers ) was investigated using dynamic mechanical analysis. The glass transition temperature was found to increase as the size and rigidity of linking groups increased and varied between 168°C for a dimethyl linking group and 300°C for a bicyclic benzoate ether-linking group. For the α-relaxation the steepness of time/temperature plots and broadness of the loss curves could be qualitatively correlated with chemical structure in a manner predicted by the coupling model of relaxation. Well-separated sub-T g transitions were also observed, as a shoulder on the low temperature side of the α-peak, and as a broad, low loss transition around -100°C. The higher temperature process was similar to the structural relaxation often found in quenched glassy polymers, while the position, intensity, and breadth of the subambient process was sensitive to chemical structure.","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"94 1","pages":"1963-1971"},"PeriodicalIF":0.0,"publicationDate":"1997-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85704588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monte Carlo simulations of polymer dynamics: Recent advances","authors":"K. Binder, W. Paul","doi":"10.1002/(SICI)1099-0488(19970115)35:1<1::AID-POLB1>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/(SICI)1099-0488(19970115)35:1<1::AID-POLB1>3.0.CO;2-#","url":null,"abstract":"A brief review is given of applications of Monte Carlo simulations to study the dynamical properties of coarse-grained models of polymer melts, emphasizing the crossover from the Rouse model toward reptation, and the glass transition. The extent to which Monte Carlo algorithms can mimic the actual chain dynamics is critically examined, and the need for the use of coarse-grained rather than fully atomistic models for such simulations is explained. It is shown that various lattice and continuum models yield qualitatively similar results, and the behavior agrees with the findings of corresponding molecular dynamics simulations and experiments, where available. It is argued that these simulations significantly enhance our understanding of the theoretical concepts on the dynamics of dense macromolecular systems. © 1997 John Wiley & Sons, Inc.","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"37 1","pages":"1-31"},"PeriodicalIF":0.0,"publicationDate":"1997-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89793059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photon correlation spectroscopy of bulk poly(n‐hexyl methacrylate) near the glass transition","authors":"Y. Hwang, G. Patterson, J. R. Stevens","doi":"10.1002/(SICI)1099-0488(199610)34:14<2291::AID-POLB1>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/(SICI)1099-0488(199610)34:14<2291::AID-POLB1>3.0.CO;2-#","url":null,"abstract":"Slowly relaxing longitudinal density fluctuations in an optically perfect sample of bulk poly(n-hexyl methacrylate) (PHMA) have been studied by photon correlation spectroscopy in the temperature range 10-36°C. The glass transition temperature for this sample was in the temperature range 10-36°C. The glass transition temperature for this sample was measured to be T g = -3°C by differential scanning calorimetry. The optical purity of the sample was verified by Rayleigh Brillouin spectroscopy and the Landau Placzek ratio was observed to be 2.3 at 25°C. Light-scattering relaxation functions were obtained over the time range 10 6 -l s. The shape of the relaxation functions broadened as the temperature was lowered towards the glass transition. Quantitative analysis of the results was carried out using the Kohlrausch-Williams-Watts (KWW) function to obtain average relaxation times , and width parameters, β. The width parameter decreased from 0.43 to 0.21 over the temperature interval, as suggested by visual inspection. Average relaxation times shifted with temperature in a manner consistent with previous mechanical studies of the primary glass-rubber relaxation in PHMA. The relaxation functions were also analyzed in terms of a distribution of relaxation rates, G(T). The calculated distributions were unimodal at all temperatures. The average relaxation times obtained from G(T) were in agreement with the KWW analysis, and the shape of the distribution broadened as the sample was cooled. The rate at which G(T) displayed a maximum correlated well with the corresponding frequency of maximum dielectric loss for PHMA. The temperature dependence of these two quantities could be reproduced with an Arrhenius activation energy of 21 Kcal/mol. A consistent picture of the molecular dynamics of PHMA near the glass transition requires a strong secondary relaxation process with a different temperature dependence from the primary glass-rubber relaxation. The present results suggest that the behavior of PHMA is similar to the other poly(alkyl methacrylates).","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"1 1","pages":"2291-2305"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90695339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dipolar relaxations in the glass transition region and in the liquid crystalline phase of two side‐chain liquid crystalline polysiloxanes","authors":"J. Ramos, J. Mano, D. Lacey, G. Nestor","doi":"10.1002/(SICI)1099-0488(19960915)34:12<2067::AID-POLB12>3.0.CO;2-#","DOIUrl":"https://doi.org/10.1002/(SICI)1099-0488(19960915)34:12<2067::AID-POLB12>3.0.CO;2-#","url":null,"abstract":"The molecular relaxation mechanisms in the glass transition region and in the liquid crystalline phase exhibited by two side-chain liquid crystalline polysiloxanes [Si(Me) 2 O] x [Si(Me)(R)O] y (R= (CH 2 ) 8 OPhCOOPh(Me)(CN) have been studied by Thermally Stimulated Discharge Currents. These results were compared with those previously obtained by dielectric relaxation spectroscopy. It was observed that two relaxation mechanisms were present in the liquid crystalline phase, and we suggest that these might correspond to the motions of the mesogenic moieties in the liquid crystalline phase.","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"121 1","pages":"2067-2075"},"PeriodicalIF":0.0,"publicationDate":"1996-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73596802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Half-Century of the Journal-of-Polymer-Science","authors":"Pearce Em, M. Sawamoto, Tirrell Da, Amis Ej","doi":"10.5860/choice.35-3307","DOIUrl":"https://doi.org/10.5860/choice.35-3307","url":null,"abstract":"Partial table of contents: POLYMER CHEMISTRY. Intramolecular Reactions in Vinyl Polymers as a Means of Investigation of the Propagation Step (E. Merz, et al.). Relative Reactivities in Vinyl Copolymerization (T. Alfrey & C. Price). Commentary: Reflections on \"Recent Developments in Polymerization by an Alternating Intra-Intermolecular Mechanism\" (G. Butler). Commentary: Relections on \"General Theory of Stationary Random Sequences with Applications to the Tacticity of Polymers\" (B. Coleman & T. Fox). Aromatic Polypyromellitimides from Aromatic Polyamic Acids (C. Sroog, et al.). Liquid Crystal Polymers. I. Preparation and Properties of p-Hydroxybenzoic Acid Copolyesters (W. Jackson & H. Kuhfuss). Photoinitiated Cationic Polymerization with Triarylsulfonium Salts (J. Crivello & J. Lam). POLYMER PHYSICS. Simple Presentation of Network Theory of Rubber, with a Discussion of Other Theories (H. James & E. Guth). The Melting Points of Chain Polymers (C. Bunn). Theory of the Interface between Immiscible Polymers (E. Helfand & Y. Tagami). Crazing and Shear Deformation in Crosslinked Polystyrene (C. Henkee & E. Kramer).","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"85 1","pages":"591-591"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79687452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The fallacy of oversimple homeostatic models","authors":"P. Wiepkema","doi":"10.1017/S0140525X00061392","DOIUrl":"https://doi.org/10.1017/S0140525X00061392","url":null,"abstract":"","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1979-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79405922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The African Dichapetalaceae","authors":"F. Breteler","doi":"10.1111/J.1438-8677.1969.TB00158.X","DOIUrl":"https://doi.org/10.1111/J.1438-8677.1969.TB00158.X","url":null,"abstract":"","PeriodicalId":16853,"journal":{"name":"Journal of Polymer Science. Part B, Polymer Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1969-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89121865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}