Polymers modulus

Ciferri, A. and Ward, I.M. (eds.) (1979) Ultra-High Modulus Polymers (Applied Science Publishers, London). 

There are two major aspects to this discussion of orientation in polymers. First, there is the question of defining orientation, and the information which can be obtained in principle by any given spectroscopic technique regarding orientation in a polymer. This leads directly to the problem of relating orientation to deformation mechanisms, because this may permit comparatively limited information to be put to optimum use. Secondly, there is the relationship between orientation and physical properties, especially mechanical properties, where such information has been valuable in stimulating and assessing practical developments such as high modulus polymers. 

A. Flores, F. J. Balta Calleja, G. E. Attenburrow, and D. C. Bassett, Microhardness Studies of Chain-extended PE III. Correlation with Yield Stress and Elastic Modulus, Polymer, 41, 5431 (2000). 

In order to see if the system could provide the flexibility to evaluate high modulus polymer pellets, an initial comparison of an HDPE and PS resins were evaluated. The experiments were conducted at a screw speed of 50 rpm and barrel temperatures of 24 and 35 °C for the HDPE and PS resins, respectively. The temperature of the screw was maintained at the barrel temperature. These conditions are similar to what might be observed in the feed casing and very early into Section 2. As... 

Tobolsk AV (1960) Properties and structure of polymers, John WUey, New York, p 166 Kolarik J (1987) In High modulus polymer fibers and fibrous composites. Academia Press (Czech), Prague, p 10... 

Cifferi A, Ward JM (eds) Ultra-high modulus polymers. Elsevier, London, chap 11... 

Gross mobility of entire chains must be low. The cohesive energy forces between chains of elastomers permit rapid, easy expansion. In its extended state, an elastomeric chain exhibits a high tensile strength, whereas at a low extension it has a low modulus. Polymers with low cross-link density usually meet the desired property requirements. The material after deformation returns to its original shape because of the cross-linking. This property is often referred to as elastic memory. 

A. Ciferri and 1. M. Ward, eds., Ultra-High Modulus Polymers, Burgess-lntl Ideas, Englewood, N.J. (1979). 

Peterlin, A., in Ultra-high Modulus Polymers, Ciferri, A., Ward, I. M. (eds.), p. 279, London Applied Science Publishers 1979... 

High Modulus Polymers Approaches to Design and Development, edited by Anagnostis E. Zachariades and Roger S. Porter... 

Ciferri A and Ward IM (Eds), "Ultra-high Modulus Polymers,", Applied Science Publishers, London, 1979. 

It is reproduced in Fig.19.22. (An even better curve fit is ermax=0.055E-0.00025E2 this curve fit is more in agreement with the clearly recognisable decrease of slope at high values of crmax and E). In comparing this Eq. (19.42) with Eq. (13.171) and Fig. 13.102, it would result in a value for [i of approximately 0.095. In comparison with Eq. (13.134) for low modulus polymers, the coefficient In Eq. (19.42) is a factor of 5 larger. 

Pennings AJ and Meihuizen KE, in Ciferri and Ward (Eds), (see General references) "Ultra-high Modulus Polymers", p 117,1979. 

This section examines the dynamic behavior and the electrical response of a TSM resonator coated with a viscoelastic film. The elastic properties of viscoelastic materials must be described by a complex modulus. For example, the shear modulus is represented by G = G + yG", where G is the storage modulus and G" the loss modulus. Polymers are viscoelastic materials that are important for sensor applications. As described in Chapter S, polymer films are commmily aj lied as sorbent layers in gas- and liquid-sensing applications. Thus, it is important to understand how polymer-coated TSM resonators respond. 

Capaccio, G., A.G. Gibson and I.M. Ward (1979) in Ultra-High Modulus Polymers, Elsevier, London, p. 1. 

Ultra-High Modulus Polymers (ed. A. Cifeni I. M. Ward), Applied Sdence Publishers, London 1979, Chapters 1, 2 and 3... 

V A. Marikhin and L. P. Myasnikova, Structural Basis of High- Strength High-Modulus Polymers, in Oriented Polymeric Materials (ed. S. Fakirov), Huthig Wepf, Zug, 1996, Chap. 2. 

Films can be burnished with almost any inert smooth soft material such as leather or a low-modulus polymer, but a simple method is with a hand-held soft cloth, or a similar cloth mounted on a harder backing device. As with spraying, better control and repeatability are achieved with some form of mechanical system in which the contact pressure, speed and duration can be accurately determined and maintained. These requirements are similar to those of a wear test machine, and in fact a simple wear test rig can often be used as a burnishing device. The contact pressure should initially be low, and should be increased progressively to a pressure approaching that which will be applied to the film in service. 

Y. Termonia and P. Smith, in The Path to High Modulus Polymers with Stiff and Flexible Chains, edited by A.E. Zachariades and R.S. Porter (Marcel Dekker, New York, 1988), p. 321. 

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