Chemical modification of LDPE film

Bag, Dibyendu S.; Kumar, Vidyapati; Maiti, Sukumar

doi:10.1002/(sici)1097-4628(19990214)71:7<1041::aid-app1>3.0.co;2-r

Cited by 53 publications

(19 citation statements)

References 16 publications

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“…However, its surfaces are inert and hydrophobic and must be made more hydrophilic in nature, e.g., to improve the printability, paintability, or the degree of adhesion to adhesives or inorganic substances [150]. Currently, the packaging industry demands LDPE owing to its high specific modulus and strength; it is used directly or in the form of laminates, with the materials such as aluminum foil or paper.…”

Section: -16mentioning

confidence: 99%

Solid-Liquid Interface

Park¹,

Seo²

2011

Interface Science and Composites

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Section: -16mentioning

confidence: 99%

Solid-Liquid Interface

Park¹,

Seo²

2011

Interface Science and Composites

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“…The chromic acid solution is prepared by mixing a source of hexavalent chromium, usually either K 2 Cr 2 O 7 or H 2 CrO 4 , with 98% sulfuric acid, to create a chromium sulfato complex that is very stable in solution and causes the oxidation of polypropylene [14,15]. The attack on polypropylene by the chromium species proceeds through a chromium(VI) ester intermediate to yield an alcohol [16].…”

Section: Introductionmentioning

confidence: 99%

Surface treatments of wood–plastic composites (WPCs) to improve adhesion

Gramlich¹,

Gardner²,

Neivandt³

2006

Journal of Adhesion Science and Technology

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In an effort to improve the adhesive bonding between wood-plastic composites (WPCs) formulated with polypropylene and a commercial epoxy adhesive, surface treatments were performed to chemically and/or physically modify the surface of WPCs. The treatments were performed on extruded WPC that had been planed and consisted of chromic acid treatment, flame treatment, water treatment, flame then water treatment and water then flame treatment. The strength of the adhesive bonds of the treated samples was tested following ASTM D 905 and the maximum shear stress was calculated for each treatment. The chromic acid and flame treatments increased their respective average shear strengths by 97% and 67% compared to an untreated control group. The increase in bond strength due to these two treatments is believed to be a result of their oxidative mechanisms. The water treatment, which consisted of covering the planed surface of a WPC with water for 10 min, resulted in an increase in shear strength of 31% relative to the control. Characterization of the watertreated WPC surface with profilometry and scanning electron microscopy indicated that the likely mechanism for the increase in bond strength was the absorption of water and subsequent swelling of the wood present in the WPC, creating greater surface area for bonding. The combination of flame and water treatments showed increased shear strength relative to the individual treatments alone, indicating that the two processes might act synergistically to facilitate the formation of stronger adhesive bonds.

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“…However, a major disadvantage of polyethylene is the difficulty of adhesion to its surface. This factor limits the use of polyethylene in many applications [1][2][3].…”

Section: Introductionmentioning

confidence: 99%