Perspectives for the practical application of surface phenomena in solid polymers

Волынский, А. Л.; Бакеев, Н. Ф.

doi:10.1201/9781315367873-12

Cited by 1 publication

(6 citation statements)

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“…For example, the viscosity of low homologs of aliphatic alcohols or hydrocarbons does not exceed 10 cP whereas the viscosity of PPG 1200 is 270 cP at 20 °C. The effect of the PALE on the mechanism of deformation of polymers is assessed by tensile tests and measurements of porosity upon stretching [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…This evidence allows the conclusion that the selected PALEs show a high crazing-promoting efficiency for polymers due to the depression in their surface energy (the Rehbinder effect in polymers) [ 20 , 31 ] and/or plasticization due to stress-induced swelling [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…Classical crazing (PET) and intercrystalline crazing of PP and HDPE are known to provide the development of a high surface area (up to 100 m 2 /g) due to self-induced nanodispersion of the polymer [ 20 ]. As the tensile strain increases, pore size and craze opening (fibril length) tend to increase.…”

Section: Resultsmentioning

confidence: 99%

“…This work offers an efficient and facile approach for the preparation of mesoporous hydrophilic and filled membranes based on high-tonnage commercial polymers (PP, HDPE, PET) with improved properties via environmental crazing of polymers in PPG, PEG, and water-ethanol solutions of PVA, including those containing salicylic acid (SA). Environmental crazing is a specific mode of plastic deformation of polymers in the presence of physically active liquid environments (PALE) which is accompanied by the development of a nanoscale fibrillar-porous structure [ 20 ]. Environmental crazing proceeds so that the as-formed porous structure is continuously loaded with the PALE and the promoting effect of the PALEs on the plastic deformation of polymers is concerned with the depression of surface energy or plasticization of polymers [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…Environmental crazing is a specific mode of plastic deformation of polymers in the presence of physically active liquid environments (PALE) which is accompanied by the development of a nanoscale fibrillar-porous structure [ 20 ]. Environmental crazing proceeds so that the as-formed porous structure is continuously loaded with the PALE and the promoting effect of the PALEs on the plastic deformation of polymers is concerned with the depression of surface energy or plasticization of polymers [ 20 , 21 , 22 ]. In common practice, PALEs are organic solvents (alcohols, hydrocarbons, chlorinated and aromatic hydrocarbons), emulsions and supercritical fluids whose Hildebrand solubility parameters are close to that of polymers [ 20 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Functionalization and Surface Modification of Mesoporous Hydrophobic Membranes by Oligomers and Target Additives via Environmental Crazing

et al. 2023

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This work offers an ecologically friendly and facile approach for the modification of high-tonnage commercial polymers, including polypropylene (PP), high-density polyethylene (HDPE), and poly(ethylene terephthalate) (PET), and preparation of nanocomposite polymeric membranes via incorporation of modifying oligomer hydrophilic additives, such as poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), polyvinyl alcohol (PVA), and salicylic acid (SA). Structural modification is accomplished via the deformation of polymers in PEG, PPG, and water-ethanol solutions of PVA and SA when mesoporous membranes are loaded with oligomers and target additives. The content of target additives in nanocomposite membranes is controlled by tensile strain, and the level of loading can achieve 35–62 wt.% for PEG and PPG; the content of PVA and SA is controlled by their concentration in the feed solution. This approach allows for the simultaneous incorporation of several additives which are shown to preserve their functional performance in the polymeric membranes and their functionalization. The porosity, morphology, and mechanical characteristics of the prepared membranes were studied. The proposed approach allows an efficient and facile strategy for the surface modification of hydrophobic mesoporous membranes: depending on the nature and content of target additives, their water contact angle can be reduced to 30–65°. Water vapor permeability, gas selectivity, antibacterial, and functional properties of the nanocomposite polymeric membranes were described.

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Section: Resultsmentioning

confidence: 99%