Performance of multilayer films using maleated linear low‐density polyethylene blends

Sánchez-Valdés, S.; Orona-Villarreal, F.; Lopez‐Quintanilla, M. L.; Yañez-Flores, I.; Valle, L.F. Ramos de; Guerrero-Salazar, C.

doi:10.1002/pen.10175

Cited by 12 publications

(11 citation statements)

References 22 publications

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“…The finer structure (less roughness) of the latter indicates better role of the in situ compatibilizer to homogenize the blend 20. The rough surface of the blends is comparable to that found by Sanchez‐Valdes et al who showed an AFM micrograph of an extruded 15% LLDPE‐ g ‐MA film with an average roughness of 317.5 nm 26. The same trend is also found in several polymer blends by SEM study, where a finer structure is found for blends having compatibilizers 24–27.…”

Section: Resultssupporting

confidence: 85%

“…The rough surface of the blends is comparable to that found by Sanchez‐Valdes et al who showed an AFM micrograph of an extruded 15% LLDPE‐ g ‐MA film with an average roughness of 317.5 nm 26. The same trend is also found in several polymer blends by SEM study, where a finer structure is found for blends having compatibilizers 24–27. More compatibilizer produces a finer structure 20, 28.…”

Section: Resultssupporting

confidence: 85%

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Morphological study of LLDPE‐NR reactive blending with maleic anhydride

Magaraphan

Skularriya

Kohjiya

2007

J of Applied Polymer Sci

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A binary blend and ternary reactive blends of 90/10 LLDPE/NR using maleic anhydride (MA) as a reactive agent with and without dicumyl peroxide (DCP) were made at 1508C in an internal mixer. The fracture surfaces of the blends were conventionally observed by TEM and atomic force microscope, revealing that the rubber domains became smaller with the addition of MA and DCP. This suggested that the in situ graft copolymer (LLDPE-g-NR) was formed and acted as an in situ compatibilizer to enhance interfacial adhesion. This was further supported by FTIR results. Importantly, after removal of NR phase from the blends, the remaining LLDPE part was dissolved in hot xylene, purified by precipitation in methanol, and carefully prepared by solvent casting for TEM observation. The microstructures of the solvent-extracted LLDPE from all blends are unlike that of solvent cast-pure LLDPE, which shows only crystalline structure. This leads to an unambiguous way to disclose the existence of an in situ graft copolymer. The solvent-extracted LLDPE from the blends shows mixed morphology of LLDPE crystalline structure and its in situ graft copolymer as nanofibrillar networks of the NR phase protruded from the amorphous region of the LLDPE matrix due to spinodal decomposition by the solvent removal. Adding MA makes more branches and fibril connections of the NR phase, whereas a thinner fibril network and more links of the NR and the LLDPE amorphous region are found in the reactive blend with MA and DCP, where the most compatibilized blend is obtained.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 85%

Morphological study of LLDPE‐NR reactive blending with maleic anhydride

Magaraphan

Skularriya

Kohjiya

2007

J of Applied Polymer Sci

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“…Liquid-crystalline polymers also offer very low oxygen permeabilities, but suffer from their high price [37]. Multilayer films based on linear low-density polyethylene grafted maleic anhydride (LLDPE-gMA), coextruded with polyamide (PA) [38], and tailored blends, such as reactive blends of ternary blends composed of poly (vinyl-alcohol)/polyamide 6/poly(ethylene-co-ethyl acrylate) (PVOH/PA6/PEEA) [39], or blends possessing a process-induced laminar morphology [40,41] are devel- a Depends on crystallinity, orientation, and water vapor in case of polyamides [307]. b Depends on ethylene content.…”

Section: Introductionmentioning

confidence: 99%

Durability of nanosized oxygen-barrier coatings on polymers

Leterrier

2003

Progress in Materials Science

472

341

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Research on silicon oxide thin films developed as gas-barrier protection for polymer-based components is reviewed, with attention paid to the relations between (i) coating defects, cohesive strength and internal stress state, and (ii) interfacial interactions and related adhesion to the substrate. The deposition process of the oxide from a vapor or a plasma phase leads in both cases to the formation of covalent bonds between the two materials, with high adhesion levels. The oxide coating contains nanoscopic defects and microscopic flaws, and their respective effect on the barrier performance and mechanical resistance of the coating is analyzed. Potential improvements are discussed, including the control of internal stresses in the coating during deposition. Controlled levels of compressive internal stresses in the coating are beneficial to both the barrier performance and the mechanical reliability of the coated polymer. An optimal coating thickness, with low oxygen permeation and high cohesive strength, is determined from experimental and theoretical analyses of the failure mechanisms of the coating under mechanical load. These investigations are found relevant to tailor the interactions and stress state in the interfacial region, in order to improve the reliability of the coating/substrate assembly. #

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“…Grafting levels of only 1-2 wt% of MAH onto the polymer backbone are all that is typically required to produce excellent adhesion to the FBE primer [41]. Nonetheless, careful control is required at all times, particularly in the case of polypropylene, as chain scission can easily occur, decreasing molecular weight and reducing overall efficiency and hence performance [42,43].…”

Section: Chemistry and Synthesis Of Adhesivesmentioning

confidence: 99%

Polymer Coatings for Oilfield Pipelines

Varley¹,

Leong²

2016

Active Protective Coatings

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Pipes and pipeline systems are an integral part of modern society, from the network of pipes that transport water, gas and sewage of our daily needs to the continuous transmission of hydrocarbons across continents satisfying the energy demands of the global economy. Despite the enormous distances and the harsh environments involved, oil and gas pipelines are the most efficient and environmentally safe form of hydrocarbon transportation currently available today. For this reason, they are critical to continued global prosperity in the 21st century.The oil and gas (O&G) industry, primarily uses steel pipelines to transport natural gas, crude oil, water, as well as petrochemical feedstocks and petroleum products which are susceptible to corrosion from their surrounding environment, be it soil (buried lines), or seawater (subsea lines) and compromising their service life. The life expectancy of oilfield pipelines ranges typically between 25-35 years so reliable protection during this period is of utmost importance. External coatings are one of the most widely used methods for providing a barrier to the steel surface against air (oxygen) and water (electrolytes), the two critical factors which most impact the electrochemical process of corrosion. Despite this, all coatings deteriorate over time due to inter alia soil stress, moisture and gas ingress, reduced adhesion, chemical attack and mechanical damage, thus imposing the challenge of maintaining the required durability and performance over the intended service life.

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Performance of multilayer films using maleated linear low‐density polyethylene blends

Cited by 12 publications

References 22 publications

Morphological study of LLDPE‐NR reactive blending with maleic anhydride

Morphological study of LLDPE‐NR reactive blending with maleic anhydride

Durability of nanosized oxygen-barrier coatings on polymers

Polymer Coatings for Oilfield Pipelines

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