{"product_id":"neutron-spin-echo-spectroscopy-viscoelasticity-rheology-9783662148037","title":"Neutron Spin Echo Spectroscopy Viscoelasticity Rheology","description":"\u003cp\u003e • Author(s): B. Ewen\u003cbr\u003e • Publisher: Springer\u003cbr\u003e • Publisher Imprint: Springer\u003cbr\u003e • BISAC: Textiles \u0026amp; Polymers\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003eViscoelasticandtransportpropertiesofpolymersintheliquid(solution, melt)or liquid-like (rubber) state determine their processing and application to a large extent and are of basic physical interest [1--3]. An understanding of these dynamic properties at a molecular level, therefore, is of great importance. However, thisunderstandingiscomplicatedbythefactsthatdi?erentmotional processes may occur on di?erent length scales and that the dynamics are governed by universal chain properties as well as by the special chemical structure of the monomer units [4,5]. The earliest and simplest approach in this direction starts from Langevin equations with solutions comprising a spectrum of relaxation modes [1--4]. Special features are the incorporation of entropic forces (Rouse model, [6]) which relax uctuations of reduced entropy, and of hydrodynamic interactions (Zimm model, [7]) which couple segmental motions via long-range back ow elds in polymer solutions, and the inclusion of topological constraints or entanglements (reptation or tube model, [8--10]) which are mutually imposed within a dense ensemble of chains. Another approach, neglecting the details of the chemical structure and concentratingontheuniversalelementsofchainrelaxation, isbasedondynamic scalingconsiderations[4,11].Inparticularinpolymersolutions, thisapproach o?ers an elegant tool to specify the general trends of polymer dynamics, although it su?ers from the lack of a molecular interpretation. A real test of these theoretical approaches requires microscopic methods, which simultaneously give direct access to the space and time evolution of the segmental di?usion. Here, quasi-elastic scattering methods play a crucial role sincetheyallowthemeasurementofthecorrespondingcorrelationfunctions.Inparticular, thehigh-resolutionneutronspinecho(NSE)spectroscopy[12--15]is very suitable for such investigations since this method covers an appropriate range in time (0.005)t\/ns)40) and space (r\/nm [15). Furthermore, the possibilityoflabellingbyhydrogen-deuteriumexchangeallowstheobservation of single-chain behavior even in the melt.\u003c\/p\u003e","brand":"Springer","offers":[{"title":"Paperback","offer_id":45281801601175,"sku":"9783662148037","price":3672.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/3471\/1191\/files\/9783662148037.webp?v=1769300270","url":"https:\/\/atlanticbooks.com\/products\/neutron-spin-echo-spectroscopy-viscoelasticity-rheology-9783662148037","provider":"Atlantic Books","version":"1.0","type":"link"}