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Polymers
Special Issues
Polymer Surface Modification and Adhesive Characteristics
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Polymer Surface Modification and Adhesive Characteristics

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Analysis and Characterization".

Deadline for manuscript submissions: closed (30 March 2023) | Viewed by 6409

Special Issue Editors

Dr. Igor Novák

E-Mail Website
Guest Editor
Polymer Institute of the Slovak Academy of Sciences, 845 41 Bratislava, Slovakia
Interests: adhesion; surface energy; surface modification of polymers; polymer nanocomposites; adhesives; discharge plasma modification of polymers and wood; antibacterial modification of polymer by plasma
Dr. Anton Popelka

E-Mail Website
Guest Editor
Center for Advanced Materials, Qatar University, P.O. Box 2713 Doha, Qatar
Interests: low-temperature plasma technology; polymer science; surface treatment; adhesion; wettability; polymer modification; surface properties

Special Issue Information

Dear Colleagues, 

The polymer surface modification represents contemporary interest because of its importance in various technological applications. Many polymers are known for their excellent mechanical properties that are very important for many applications such as those in packaging, automobile, building, aeronautic, aerospace, electronics, and sport industries. However, poor adhesion characteristics of most polymers are a serious problem in situations where laminates are made or other layers are incorporated. Adhesion represents a multidisciplinary topic including the surface chemistry, physics, rheology, mechanic, fracture analysis and many other fields. Current research activities are associated with unraveling the mechanisms of surface modifications and ensuring long lasting adhesion. 

In this Special Issue, attention is given to novel, advanced, improved or economical effective modification techniques including physical or chemical way. This covers different modification approaches that can be utilized to improve the adhesion characteristics of polymer surfaces, such as low-temperature plasma treatment (both atmospheric and vacuum), plasma assisted grafting, plasma polymerization, flame treatment, ozone treament, photografting, UV photo-oxidation or chemical modification and their effect on the surface properties. The above mentioned interest is only indicative and can by extended by new techniques and approaches. Eventually, comparative studies of surface properties and adhesion characteristics using novel tools and techniques are welcomed for this Special Issue including theoretical modeling or simulations. Moreover, review papers regarding surface modifications of polymers are welcomed as well.

Prof. Dr. Igor Novák
Dr. Anton Popelka
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • surface modification
  • plasma treatment
  • plasma assisted grafting
  • UV photo-oxidation
  • ozone treatment
  • surface properties
  • adhesion characteristics
  • wettability
  • surface free energy
  • surface roughness

Published Papers (3 papers)

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Research

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21 pages, 4086 KiB  
Article
Impact of Non-Accelerated Aging on the Properties of Parylene C
by Franz Selbmann, Christina Scherf, Jörn Langenickel, Frank Roscher, Maik Wiemer, Harald Kuhn and Yvonne Joseph
Polymers 2022, 14(23), 5246; https://doi.org/10.3390/polym14235246 - 01 Dec 2022
Cited by 3 | Viewed by 1966
Abstract
The polymer Parylene combines a variety of excellent properties and, hence, is an object of intensive research for packaging applications, such as the direct encapsulation of medical implants. Moreover, in the past years, an increasing interest for establishing new applications for Parylene is [...] Read more.
The polymer Parylene combines a variety of excellent properties and, hence, is an object of intensive research for packaging applications, such as the direct encapsulation of medical implants. Moreover, in the past years, an increasing interest for establishing new applications for Parylene is observed. These include the usage of Parylene as a flexible substrate, a dielectric, or a material for MEMS, e.g., a bonding adhesive. The increasing importance of Parylene raises questions regarding the long-term reliability and aging of Parylene as well as the impact of the aging on the Parylene properties. Within this paper, we present the first investigations on non-accelerated Parylene C aging for a period of about five years. Doing so, free-standing Parylene membranes were fabricated to investigate the barrier properties, the chemical stability, as well as the optical properties of Parylene in dependence on different post-treatments to the polymer. These properties were found to be excellent and with only a minor age-related impact. Additionally, the mechanical properties, i.e., the Young’s modulus and the hardness, were investigated via nano-indentation over the same period of time. For both mechanical properties only, minor changes were observed. The results prove that Parylene C is a highly reliable polymer for applications that needs a high long-term stability. Full article
(This article belongs to the Special Issue Polymer Surface Modification and Adhesive Characteristics)
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12 pages, 1881 KiB  
Article
Copper Ions Absorbed on Acrylic-Acid-Grafted Polystyrene Enable Direct Bonding with Tunable Bonding Strength and Debonding on Demand
by Roman Günther, Walter Caseri and Christof Brändli
Polymers 2022, 14(23), 5142; https://doi.org/10.3390/polym14235142 - 25 Nov 2022
Cited by 3 | Viewed by 1528
Abstract
Recycling adhesively bonded polymers is inconvenient due to its expensive separation and removal of adhesive residues. To tackle this problem, adhesive technologies are needed allowing debonding on demand and which do not contaminate the surface of the substrate. Direct bonding enabled by oxygen [...] Read more.
Recycling adhesively bonded polymers is inconvenient due to its expensive separation and removal of adhesive residues. To tackle this problem, adhesive technologies are needed allowing debonding on demand and which do not contaminate the surface of the substrate. Direct bonding enabled by oxygen plasma treatment has already achieved substantial adhesion between flat substrates. However, debonding takes place by water, thus limiting the applications of this technology to water-free environments. The work presented in the following shows that this drawback can be overcome by grafting acrylic acid and adding copper(II) ions on the surface of polystyrene. In this process, the number of functional groups on the surface was significantly increased without increasing the surface roughness. The bonding strength between the substrates could be increased, and the process temperature could be lowered. Nevertheless, the samples could be debonded by exposure to EDTA solution under ultrasound. Hence, by combining acrylic acid grafting, variations in the bonding temperatures and the use of copper(II) ions, the bonding strength (5 N to >85 N) and the debonding time under the action of water can be tuned over large ranges (seconds to complete resistance). Full article
(This article belongs to the Special Issue Polymer Surface Modification and Adhesive Characteristics)
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Review

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20 pages, 4212 KiB  
Review
Hydrophobic Recovery of Plasma-Hydrophilized Polyethylene Terephthalate Polymers
by Gregor Primc and Miran Mozetič
Polymers 2022, 14(12), 2496; https://doi.org/10.3390/polym14122496 - 19 Jun 2022
Cited by 12 | Viewed by 2088
Abstract
Oxygen plasma is widely used for enhancing the wettability of numerous polymers, including polyethylene terephthalate (PET). The treatment with plasma containing oxygen will cause surface functionalization with polar functional groups, which will, in turn, improve the wettability. However, the exact mechanisms leading to [...] Read more.
Oxygen plasma is widely used for enhancing the wettability of numerous polymers, including polyethylene terephthalate (PET). The treatment with plasma containing oxygen will cause surface functionalization with polar functional groups, which will, in turn, improve the wettability. However, the exact mechanisms leading to the hydrophilic or even super-hydrophilic surface finish are still insufficiently explored. The wettability obtained by plasma treatment is not permanent, since the hydrophobic recovery is usually reported. The mechanisms of hydrophobic recovery are reviewed and explained. Methods for suppressing this effect are disclosed and explained. The recommended treatment which assures stable hydrophilicity of PET samples is the treatment with energetic ions and/or vacuum ultraviolet radiation (VUV). The influence of various plasma species on the formation of the highly hydrophilic surface finish and stability of adequate wettability of PET materials is discussed. Full article
(This article belongs to the Special Issue Polymer Surface Modification and Adhesive Characteristics)
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