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Slip-additive Migration, Surface Morphology, and Performance on Injection Moulded High-Density Polyethylene Closures

Slip-additive Migration, Surface Morphology, and Performance on Injection Moulded High-Density Polyethylene Closures

Nabeen Dulal, Robert Shanks, Thomas Gengenbach, Harsharn Gill, David Chalmers, Benu Adhikari, Isaac Pardo Martinez

J Colloid Interface Sci. 2017 Nov 1;505:537-545.

PMID: 28645037

Abstract:

Hypothesis:
The amount and distribution of slip agents, erucamide, and behenamide, on the surface of high-density polyethene, is determined by integral characteristics of slip agent structure and polymer morphology. A suite of surface analysis techniques was applied to correlate physicochemical properties with slip-additive migration behaviour and their surface morphology. The migration, surface morphology and physicochemical properties of the slip additives, crystallinity and orientation of polyethene spherulites and interaction between slip additives and high-density polyethene influence the surface characteristics.
Experimental:
The high-density polyethene closures were produced with erucamide and behenamide separately and stored until they produced required torque. Surface composition was determined employing spectroscopy and gas chromatography. The distribution of additives was observed under optical, scanning electron and atomic force microscopes. The surface energy, crystallinity and application torque were measured using contact angle, differential scanning calorimeter and a torque force tester respectively.
Results and discussion:
Each slip additive produced a characteristic amide peak at 1645cm-1 in infrared spectroscopy and peaks of oxygen and nitrogen in X-ray photoelectron spectroscopy, suggesting their presence on the surface. The erucamide produced placoid scale-like structures and behenamide formed denticulate structures. The surface erucamide and behenamide responsible for reducing the torque was found to be 15.7µg/cm2 and 1.7µg/cm2.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP3061754	Behenamide		3061-75-4	Price

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