Electronic Resource
The twice renormalized rouse formalism of polymer dynamics. Segment diffusion, terminal relaxation, and nuclear spin-lattice relaxation
| العنوان: | The twice renormalized rouse formalism of polymer dynamics. Segment diffusion, terminal relaxation, and nuclear spin-lattice relaxation |
|---|---|
| المؤلفون: | Fatkullin N., Kimmich R., Kroutieva M. |
| المصدر: | SCOPUS00444510-2000-118-1-SID0011240224 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The twice renormalized Rouse formalism, a refined version of Schweizer's renormalized Rouse treatment of chain dynamics in entangled polymers, is presented. The time scale of validity is extended including terminal chain relaxation and center-of-mass diffusion. In clear contrast to the laws concluded from other polymer dynamics concepts such as the reptation (tube) model or the polymer mode-mode coupling formalism, the predictions perfectly compare with all results of recent spin-lattice relaxation dispersion and diffusion experiments as well as computer simulations. On the other hand, the twice renormalized Rouse formalism fails to explain the rubber-elastic plateau of stress relaxation. It is inferred that this is a consequence of the single-chain nature of the present approach not accounting for the fact that viscoelasticity largely is a manifestation of collective many-chain modes. In the rigorous sense, no such multi-chain treatment has been established so far to our knowledge. The necessity to consider inter-chain cooperativity in any really comprehensive polymer dynamics theory is concluded from low-frequency spin-lattice relaxation data, which are shown to reflect fluctuations of long-distance intermolecular dipole-dipole interactions. |
| مصطلحات الفهرس: | Article |
| URL: | Zhurnal Eksperimental'noj i Teoreticheskoj Fiziki 1 170 118 |
| الاتاحة: | Open access content. Open access content |
| Other Numbers: | RUNEI oai:rour.neicon.ru:rour/130364 kpfu:oai:dspace.kpfu.ru:net/95336 1042734406 |
| المصدر المساهم: | NEICON SCIENT LIBR From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1042734406 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |