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Abstract

The mechanism of LLDPE blown film blocking has been investigated. Film specimens exhibiting different levels of blocking force are fabricated using resins with various molecular characteristics. The film surface morphology and the chemical composition are studied. Atomic force microscopy observations clearly linked blocking with the formation of a soft layer at the films’ interface. This layer is made of amorphous PE chains, which migrated to the film surface during conditioning at 60 C. No evidence of co-crystallization at the interface is observed. The chemical nature of the soft layer has been derived from its mechanical properties. A predictive model for film blocking is proposed based on a single molecular parameter.

Keywords

LLDPE polyethylene films matallocene Ziegler-Natta self-adhesion short-chain branching blocking force hexane extractables

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References

Maltby, A. and Ruxton, P. (1999). Polymers and Polymer Composites, 7: 8 .

Wanzek, R. (1979). Kunstsoffe, 69: 6 .

Schultz (1980). Double Liaison - Chimie des Peintures, 27(301): 471-474 .

Hazlitt , et al. (1994). J. Appl. Polym. Sci., 51: 271-278 .

Mangipudi , et al. (1994). J. Adhesion Sci. Technol., 8: 11 .

Zisman, W.A. (1963). Ind. Eng. Chem., 55: 10 .

Chun, H. and Gent, A.N. (1996). J. Polym. Sci. Part B Polym. Phys., 34: 2223-2229 .

Johnson, K.L. , Kendall, K. and Roberts, A.D. (1971). Proc. R. Soc. London, Ser. A., 324: 301-313 .

Wake, W.C. (1982). Adhesion and the Formulation of Adhesives, 2nd edn, pp. 73-87, Applied Science Publishers LTD.

10.

De Gennes, P.G. (1982). Georges, J.M. (ed.), Microscopic Aspects of Adhesion and Lubrification, Elsevier.

11.

Kausch, H.H. and Tirrell, M. (1989). Annu. Rev. Mater. Sci., 19: 341-371 .

12.

De Gennes, P.G. (1989). J. Phys. France, 50: 2551-2562 .

13.

Horne, S.E. and Suarez, J.J. (1969). Blocking of Polyethylene Packaging Films , In: Plastics in Packaging Nat. Tech. Conf., Soc. Plast. Eng., pp. 23-27 .

14.

Johnson, K.L. , Kendall, K. and Roberts, A.D. (1971). Proc. R. Soc. London, Ser. A., 324: 301-313 .

15.

15. WO Patent 97/44371.

Blocking of LLDPE Films - Effect of Surface Morphology

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