Download Absorbent Polymer Technology by Lisa Brannon-Peppas PDF

By Lisa Brannon-Peppas

Lately, there was a veritable explosion of analysis and improvement in consumer-oriented fields that make the most of polymeric fabrics which take up quite a lot of water. those fields surround the coaching, characterization and commercialization of separation platforms, pharmaceutical and private care items resembling youngster diapers, female items, incontinence items and lots of different comparable components. The polymeric fabrics used in those purposes are referred to as absorbent or superabsorbent fabrics as a result of their skill to swell quickly and to hold huge volumes of water, urine and different organic fluids. the purpose of this e-book is to introduce the basics of polymer constitution and swelling as on the topic of polymers used for those superabsorbent fabrics. within the box of absorbence, specific awareness is given to crosslinked constructions which swell to greater than fifty instances their preliminary weight in water or electrolytic recommendations. The publication additionally presents descriptions of novel functions of superabsorbent fabrics in addition to an in depth research of water delivery in crosslinked polymers

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M. O. Weaver, E. B. Bagley, G. F. Fanta and W. M. Doane, U. S. patent 3,997,484, 1976. A. R. Reid, U. S. patent 4,028,290, 1977. F. Masuda, K. Nishida and A. Nakamura, U. S. patent 4,076,663, 1978. G. F. Fanta and W. M. Doane, U. S. patent 4,045,387, 1977. P. K. Chatterjee, R. B. Schwenker, U. S. patent 4,200,557, 1980. 44 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. K. Heidel, U. S. patent 4,777,232, 1988. A. Bazuaye, F. E. Okieimen and O. B. Said, J. : Part C. , 27 (1989) 433. J. Gross, U.

3jp_\ 2 Mc \ Mn / 2/3^1/3 ' (7) The swollen modulus therefore depends on the molecular weight between crosslinks, Mc, the backbone molecular weight, Mn, the concentration during crosslinking, represented by the polymer volume fraction at crosslinking, v2r, and the polymer volume fraction during measurement, v2. The molecular weight between crosslinks and the backbone molecular weight together define the amount of dangling chains in the network. The fraction of "dangling chains", or network chains having one end attached at a crosslink point and the other unattached to the network, is accounted for in equation 7 by a factor of 2 Mc/Mn in the term (1-3 Mc/Mn).

A. A. M. A. Mktchian, Eur. Polym. , 11 (1975) 153. 45 PREPARATION AND CHARACTERIZATION OF CROSSLINKED NETWORKS HYDROPHILIC L. O. Box 708, Greenfield, IN 46140, USA SUMMARY In preparing and evaluating polymers for use as absorbent materials, it is critical to know those parameters which will govern the nature of the final polymer. This chapter presents different methods of producing and characterizing crosslinked polymers. Mathematical analyses are given to calculate the degree of swelling, molecular weight between crosslinks, and other characteristics of neutral and ionic polymers based upon such values as the polymer/solvent interaction parameter, dissociation constant of the pendant chains within the polymer and number average molecular weight before crosslinking.

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