By Shau-Tarng Lee, N. S. Ramesh
This publication is the inaugural quantity a sequence entitled Polymeric Foams: expertise and functions. ordinarily, thermoplastic and thermoset foams were taken care of as separate practices in undefined. Polymeric Foams: Mechanisms and fabrics offers the fundamentals of foaming ordinarily construct a powerful starting place to these operating in either thermoplastic and thermoset foams. The booklet addresses clinical ideas at the back of polymeric foaming and offers foaming chemistry and physics, resin and blowing brokers, and foaming mechanisms in separate chapters, hence supplying an total and primary realizing of foaming for polymeric foam items and tactics.
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Additional resources for Polymeric Foams: Mechanisms and Materials (Polymeric Foams Series)
Some capillary rheometers also have an attachment to measure the extrudate swell online. The diameter of the extrudates is measured using a laser beam emitted from (B) to (C). Then the extrudate swell ratio B (= D/D0), the ratio of the diameter of an extrudate strand D to that of the capillary die D0, is calculated. The strands are not pulled in case of extrudate swell measurements. , on tdie . 1 Experimental Methods for Elongational Viscosity Mode Uniaxial Elongational Viscosity Planar or Biaxial Elongational Viscosity Method Principle Reference Meissnertype A rectangular or rod-shaped specimen, floating by buoyancy or air flow, is stretched by two rotating clamps.
160°C . 6 Growth curves of uniaxial elongational viscosity hE+ (t , e˙ ) at various strain rates e˙ for (A) tubular LDPE and (B) autoclave LDPE at 160˚C. The solid line represents 3h+(t), where h+(t) is transient shear viscosity at the low strain rate asymptote calculated from linear viscoelastic properties. Numbers in the figure denote the strain rate. (From Yamaguchi, M. , Polymer, 42, 8663, 2001. , the number of short-chain branches. This result reveals that shrinkage after expansion is prominent for crosslinked PE in spite of rapid cooling due to adiabatic expansion of gas in cells.
63,84,88 Another important miscible blend system is a blend with an ultrahigh molecular weight fraction of the same polymer species. 14) Under this condition, coil-stretch transition takes place owing to the drag flow, and then the molecular chain is stretched. 91 This is reasonable because it takes a long time to dissolve each molecular chain, owing to the low diffusion constant of a high molecular weight fraction. , diffusion distance, of an ultrahigh molecular weight fraction. Nevertheless, the intense mixing often induces molecular scission due to high stress.