Fundamentals of Polymer Engineering Part 11 ppt

... Inc. wherekisBoltzmann’sconstant.Inthepresentcase,pðxÞisgivenbyEq.(10.2.9) sothat f¼ÀT d dx À k 2 lnð2npl 2 x ÞÀ kx 2 2nl 2 x  þ dU dx ð10:3:5Þ andcarryingoutthedifferentiation, f¼ kTx nl 2 x þ dU dx ¼ 3kTx nl 2 þ dU dx ð10:3:6Þ Theinternalenergyterminthisequationisrelatedtochangesintheinternal potentialenergyarisingfromthemakingandbreakingofvanderWaalsbonds. Becauserubberselongateveryeasil...

Ngày tải lên: 10/08/2014, 19:20

... quality’’ that is often observed: The polymer that leaves the extruder can consist of islands of relatively cold, unmelted polymer floating in very hot molten liquid. 11. 7 INFLUENCE OF POLYMER CHAIN EXTENSION ... Inc. semicrystallineandtheotheramorphous,noncrystallizablesequenceswillbe builtinbetweenthecrystallizablesequencesofthesemicrystallinepolymer.This hasaprofoundeffectonth...

Ngày tải lên: 10/08/2014, 19:20

... therefore, no pressurization of melt in the screw bushings. A consequence of this is a decoupling of the different parts of the extruder, and what happens in one portion of the extruder does not ... single-screw device feeds solid polymer to the TSE at any desired rate, and as a consequence, the conveying channels of the TSE are only partially filled with polymer; the degree of...

Ngày tải lên: 10/08/2014, 19:20

Ngày tải lên: 10/08/2014, 19:20

... Inc. 9.2CriteriaforPolymerSolubility376 9.3TheFlory-HugginsTheory379 9.4Free-VolumeTheories396 9.5TheSolubilityParameter398 9.6PolymerBlends401 9.7Conclusion403 References403 Problems405 10.TheoryofRubberElasticity407 10.1Introduction407 10.2ProbabilityDistributionfortheFreelyJointedChain408 10.3ElasticForceBetweenChainEnds415 10.4Stress-StrainBehavior418 10.5TheStressTensor(Matrix)420 10.6Me...

Ngày tải lên: 10/08/2014, 19:20

... molecular structure of the graft copolymer and the number of grafts formed. In addition, the length of the graft may vary, and the graft copolymer often carries a fair amount of homopolymer. The ‘‘graft-onto’’ ... classification of polymers is based on molecular structure. According to this system, the polymer could be one of the following: 1. Linear-chain polymer 2. Branched-c...

Ngày tải lên: 10/08/2014, 19:20

... Rosen, S. L., Fundamental Principles of Polymeric Materials, Wiley–Interscience, New York, 1982. 3. Kumar, A., and S. K. Gupta, Fundamentals of Polymer Science and Engineering, Tata McGraw-Hill, New ... is found to reduce with the degree of acetylation, the latter imparting higher strength to the polymer. The main usage of the polymer is in the preparation of films and sheets...

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... A., and D. H. Sebastian, Principles of Polymerization Engineering, Wiley, New York, 1983. 4. Kumar, A., and S. K. Gupta, Fundamentals of Polymer Science and Engineering, Tata McGraw-Hill, New ... Experimental Validation of Reversible Polymerization, Ph.D. thesis, Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India, 1988. Step-Growth Polymerizati...

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... application of a vacuum in order to obtain a polymer Reaction Engineering of Step-Growth Polymerization 169 Copyright © 2003 Marcel Dekker, Inc. The total pressure P T is then the sum of partial ... condensation polymerization of two monomers A and B that do not mix. In such cases, the monomers diffuse to the interface and polymerize there. Find the molecular weight of the poly...

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... polymerization. Thus, polymer radicals lie only within these polymer particles. The total number of polymer particles per unit volume of emulsion in the second stage of the emulsion polymerization is ... the polymer particles and generate polymer radicals therein. These polymer radicals can also diffuse out of the particle or undergo a mutual termination with other polyme...

Ngày tải lên: 10/08/2014, 19:20