Permeation of hydrocarbons through organosilane crosslinked LDPE

Berger, Katrin; Keimel, Christian; Helfer, Eric; Haar, Bernd; Eder, Alexander; Mattausch, Hannelore; Rieß, Gisbert

doi:10.1002/app.45374

Cited by 13 publications

(9 citation statements)

References 39 publications

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“…The diffusion coefficient decreases with increasing permeant weight, size (molecular volume) and cross-sectional area of the penetrant. [9][10][11] The shape of the permeant has been reported to have a profound effect on diffusion. [10,11], For example, permeants with linear, flexible, and symmetrical molecules have higher mobility than rigid molecules.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Permeation of Low‐Molecular‐Weight Hydrocarbons through Polyolefins for Testing of a New Developed Method

Berger

Rieß

2022

Macro Chemistry & Physics

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In onshore oil and gas industries polymers are considered as a potential pipe material. One special aspect in this field of application is the resistance of the material against the permeation of low-molecular-weight hydrocarbons. These small molecules may permeate through the material and cause environmental problems. In this contribution, the main influencing parameters on the permeation process of low-molecular-weight hydrocarbons through hig-density polyethylene (HDPE a) re investigated by gravimetric analysis. To bypass the limitations of this well-established method a new measuring method based on gas chromatography-mass spectroscopy (GC-MS) techniques is developed. The main advantages of the newly developed system are demonstrated by test measurements of filled polyethylene (PE) pipes. The comparison of the calculated permeation rates of the tested hydrocarbons using both measuring methods showed a good accordance of the results.

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Section: Introductionmentioning

confidence: 99%

Analysis of Permeation of Low‐Molecular‐Weight Hydrocarbons through Polyolefins for Testing of a New Developed Method

Berger

Rieß

2022

Macro Chemistry & Physics

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“…Crosslinked polyolefin is a value-added material practiced in applications such as wire and cable insulation materials and plastic pipes. [1,2] There are three traditional technologies: peroxide-crosslinking, [3] radiation-crosslinking, [4] and silanecrosslinking. Therein, silane-crosslinking is achieved by grafting vinyl silane (VS) onto the polyethylene (PE) chain with a small amount of peroxide.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of crosslinking in benzoyl peroxide‐initiated functionalization of vinyltriethoxysilane onto polypropylene in the water medium

Yuan

Shao

Liang

et al. 2020

J of Applied Polymer Sci

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Silane grafting and moisture crosslinking is one of the most common methods in the production of crosslinked polyolefin. A remarkable increase in the percentage of gel in the product was observed in benzoyl peroxide‐mediated aqueous suspension grafting of vinyltriethoxysilane onto polypropylene. Aimed to explore the crosslinking reaction mechanism in this functionalization process, comprehensive experiments had been conducted and the grafted products were characterized by mass spectrometry, 1H NMR, and 29Si NMR spectroscopy. Finally, a novel crosslinking mechanism was proposed based on the characterization results.

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“…The peroxide decomposes and forms radicals, which eliminate hydrogen atoms of the polymer chains. Then the silane groups are grafted to the polymer chains and form linkages between the chains [1,3,4]. There are different types of polyethylene with different numbers and types of chain branches depending on process and catalyst [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…For the linkage of the initiator to the talcum surface three steps were necessary and performed according to the study of Gert Boven et al [23]. The silane and peroxide used for the crosslinking experiments were selected on the base of good experiences [4]. Due to the good crosslinking capability of ethylene-octen copolymer, a blend of LDPE and EOC was used.…”

Section: Introductionmentioning

confidence: 99%

Physical Foaming and Crosslinking of Polyethylene with Modified Talcum

et al. 2019

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The aim of this study was the investigation of the use of modified talcum for supporting crosslinking and as novel nucleating agent for physical foaming of polyethylene. For the modification of the talcum, a thermal initiator was linked to the talcum surface. During the extrusion process, the initiator decomposes, and gas and radicals are formed. The gas generates the nucleation of cells and the radicals support the crosslinking process between the polymer chains. The modification of the talcum was performed in three steps: The first step was the grafting of alkoxysilanes onto the talcum surface. The second step was the chlorination of the thermal initiator for an easier linkage, and the last step was the linking between the initiator and the silanes grafted onto the talcum surface. For this study, two investigations were carried out. One investigation was the analysis of the crosslinking effect with the modified talcum. For this purpose, polyethylene plates were compression molded and the viscoelastic properties were measured with a parallel plate rheometer. The use of the modified talcum led to a higher crosslinking density. The second investigation was the physical foaming experiment in an extrusion process with nitrogen as blowing agent using both a pure and the modified talcum as nucleating agents. The foamed samples were characterized in terms of density, cell size and cell density, and compared with each other. The blend with the modified nucleating agent indicated a foam structure with a smaller mean cell size and a lower density compared to the use of the pristine nucleating agent.

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Permeation of hydrocarbons through organosilane crosslinked LDPE

Cited by 13 publications

References 39 publications

Analysis of Permeation of Low‐Molecular‐Weight Hydrocarbons through Polyolefins for Testing of a New Developed Method

Analysis of Permeation of Low‐Molecular‐Weight Hydrocarbons through Polyolefins for Testing of a New Developed Method

Mechanism of crosslinking in benzoyl peroxide‐initiated functionalization of vinyltriethoxysilane onto polypropylene in the water medium

Physical Foaming and Crosslinking of Polyethylene with Modified Talcum

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