Surface modification of linear low‐density polyethylene film by amphiphilic graft copolymers based on poly(higher α‐olefin)‐graft‐poly(ethylene glycol)

Abstract

In this article, a series of amphiphilic graft copolymers, namely poly(higher a-olefin-co-para-methylstyrene)-graft-poly(ethylene glycol), and poly(higher a-olefin-co-acrylic acid)-graft-poly(ethylene glycol) was used as modifying agent to increase the wettability of the surface of linear low-density polyethylene (LLDPE) film. The wettability of the surface of LLDPE film could be increased effectively by spin coating of the amphiphilic graft copolymers onto the surface of LLDPE film. The higher the content of poly(ethylene glycol) (PEG) segments, the lower the water contact angle was. The water contact angle of modified LLDPE films was reduced as low as 25. However, the adhesion between the amphiphilic graft copolymer and LLDPE film was poor. To solve this problem, the modified LLDPE films coated by the amphiphilic graft copolymers were annealed at 110 for 12 h. During the period of annealing, heating made polymer chain move and rearrange quickly. When the film was cooled down, the alkyl group of higher a-olefin units and LLDPE began to entangle and crystallize. Driven by crystallization, the PEG segments rearranged and enriched in the interface between the amphiphilic graft copolymer and air. By this surface modification method, the amphiphilic graft copolymer was fixed on the surface of LLDPE film. And the water contact angle was further reduced as low as 14.8 . The experimental results of this article demonstrate the potential pathway to provide an effective and durable anti-fog LLDPE film.

Transparent, Hydrophobic Fluorinated Ethylene Propylene Offers Rapid, Robust, and Irreversible Passive Adsorption of Diagnostic Antibodies for Sensitive Optical Biosensing

“…Equilibrium adsorption of IgG onto Teflon FEP and LLDPE was very similar, as seen from the almost overlapping Langmuir isotherms in Figure 5B and best-fitted Langmuir parameters (Table 3). This is due presumably to similar hydrophobicity of the two polymers, showing contact angles with water of 123°2 2 and 120°, 23 respectively. 21 However, it contrasted with the Langmuir isotherms obtained for the glass capillaries having a contact angle of ∼25°, 24 which showed a 2-to 4-fold larger mass of antibody adsorbed per surface area available based on data shown in both Figure 5B and Figure 5C.…”

“…The IgG solutions were incubated inside the Teflon FEP capillaries for 2 h at room temperature. The effect of surface chemistry on IgG adsorption was studied by comparing antibody adsorption in Teflon FEP (contact angle 123 ± 1.6° with water) with LLDPE (CH 3 plastic polymer, contact angle with water ∼120°) and glass capillaries (borosilicate glass, with contact angle with water 25°) at pH 7.4, for 2 h at room temperature.…”

Water drop-surface interactions as the basis for the design of anti-fogging surfaces: Theory, practice, and applications trends

“…In general, the migration of surfactants can be slowed down if bonded to inorganic nanoparticles such as SSNPs [266][267][268] or if added to blends of hydrophilic grafted co-polymers with un-grafted ones [269]. To retain wetting features for longer periods of time, covalent grafting of "bulky" surfactants, also known as "graft co-polymerization", represents a feasible alternative to plasma and ionic implantation treatments, as well as the addition of surfactants per se [270,271]. The applicability of this surface treatment on low surface energy polymers is motivated by the fact that the steric hindrance prevents these molecules from hiding in the bulk, thus hampering surface aging.…”

A Facile Method for Delaying the Migration of Antifogging Agents in Polyethylene Films

“…5 To overcome the fogging problem, many types of methods have been developed based on reducing the effects of surface tension. 6,7 Usually, a PE film is endowed with an antifogging feature by increasing its surface energy, thus rendering it hydrophilic. Under such circumstances, instead of forming discrete scattering droplets, a continuation of the water layer prevents noticeable reduction in transmittance.…”

“…To overcome the fogging problem, many types of methods have been developed based on reducing the effects of surface tension. , Usually, a PE film is endowed with an antifogging feature by increasing its surface energy, thus rendering it hydrophilic. Under such circumstances, instead of forming discrete scattering droplets, a continuation of the water layer prevents noticeable reduction in transmittance. − This can be achieved by two strategies, termed as external topical coating and internal migratory additives. , External topical coating is the coating of a layer of hydrophilic substance on the film surface, while the internal migratory additive strategy incorporates hydrophilic surfactants (glycerol esters, sorbitol esters, etc .)…”