Polymer nanocomposite coatings based on polyhedral oligosilsesquioxanes: route for industrial manufacturing and barrier properties

Männle, Ferdinand; Tofteberg, Terje; Skaugen, Morten; Bu, Huaitian; Peters, Thijs; Dıetzel, Pascal D. C.; Pilz, Monika

doi:10.1007/s11051-011-0435-7

Cited by 21 publications

(22 citation statements)

References 35 publications

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“…Degradation of P-2 within 200–300 °C (T d2 = 238.2 °C, V d2 = 6.10%∙min/°C) may be linked to partial siloxane chain scission/chain transfer as a result of interactions of nucleophilic thiols and electrophilic silicon atoms in the main chain, analogously to the degradation pattern observed for silicones functionalized with γ-chloropropyl groups [ 44 , 45 ]. The next process observed for P-2 was also severe and quite rapid (T d3 = 357.4 °C, V d3 = 2.77%∙min/°C), and we have attributed it to amide bonds degradation (analogously to those reported in the literature [ 34 , 41 , 43 , 46 ]). The residual carboxylic moieties (~30% of the siloxane units) may also participate in the decomposition of amide bonds (acidolysis of amides [ 47 , 48 ]).…”

Section: Resultssupporting

confidence: 80%

“…, and we have attributed it to amide bonds degradation (analogously to those reported in the literature [34,41,43,46]). The residual carboxylic moieties (~30% of the siloxane units) may also participate in the decomposition of amide bonds (acidolysis of amides [47,48]).…”

Section: Samplesupporting

confidence: 80%

“…Thermal degradation characteristics (the prepared materials and their precursor). Thermal degradation of the studied products P-1, P-2 and P-3 starts at T > 120 • C. Within 120-150 • C, traces of moisture and volatiles may desorb from the material, as previously shown for ladder [2-(carboxymethylthio)ethyl]polysilsesquioxanes [40] and octahedral silsesquioxanes grafted with N-ethylhexanamide groups [41]. However, for P-3, the initial weight decrease overlaps with another process with a maximum at 159 • C (19.6 wt.% decrease at 1.7%•min/ • C).…”

Section: Synthesis and Properties Of The Functionalized Polysiloxanessupporting

confidence: 66%

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New Antiadhesive Hydrophobic Polysiloxanes

et al. 2021

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Intrinsic hydrophobicity is the reason for efficient bacterial settlement and biofilm growth on silicone materials. Those unwelcomed phenomena may play an important role in pathogen transmission. We have proposed an approach towards the development of new anti-biofilm strategies that resulted in novel antimicrobial hydrophobic silicones. Those functionalized polysiloxanes grafted with side 2-(carboxymethylthioethyl)-, 2-(n-propylamidomethylthioethyl)- and 2-(mercaptoethylamidomethylthioethyl)- groups showed a wide range of antimicrobial properties towards selected strains of bacteria (reference strains Staphylococcus aureus, Escherichia coli and water-borne isolates Agrobacterium tumefaciens, Aeromonas hydrophila), fungi (Aureobasidium pullulans) and algae (Chlorella vulgaris), which makes them valuable antibacterial and antibiofilm agents. Tested microorganisms showed various levels of biofilm formation, but particularly effective antibiofilm activity was demonstrated for bacterial isolate A. hydrophila with high adhesion abilities. In the case of modified surfaces, the relative coefficient of adhesion for this strain was 18 times lower in comparison to the control glass sample.

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Section: Resultssupporting

confidence: 80%

Section: Samplesupporting

confidence: 80%

Section: Synthesis and Properties Of The Functionalized Polysiloxanessupporting

confidence: 66%

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New Antiadhesive Hydrophobic Polysiloxanes

et al. 2021

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“…The use of commodities in POSS synthesis provides a significantly improved cost/benefit when compared with POSS synthesis, which is based on silanes alone. A high solids air drying paint, where amide substituted POSS is an essential part of the binder system has been commercialized [35].…”

Section: Introductionmentioning

confidence: 99%

Thermal Oxidation of Polyolefins by Mild Pro-Oxidant Additives Based on Iron Carboxylates and Lipophilic Amines: Degradability in the Absence of Light and Effect on the Adhesion to Paperboard

2015

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Marine and inland pollution by non-degradable plastic bags and other plastic articles is a topic of great concern. Natural degradation processes based on oxidation of plastic pollutants could possibly contribute to limit the extent of pollution. Thermal degradation of polyolefins in the absence of light by non-polluting pro-oxidants has not been presented before. In this study, we show that two amines, stearyl amine and [(3-(11-aminoundecanoyl) amino) propane-1-] silsesquioxane (amino-POSS) in combination with ferric stearate (FeSt 3 ) tremendously accelerate the thermal oxidation of polyolefins compared with reference samples. Both amines and FeSt 3 are to a large extent based on renewable resources. Polyethylene and polypropylene samples containing less than 100 ppm of iron and 1% of amine were extremely brittle after 10 days in a circulation oven in the absence of light. No significant degradation could be seen with samples containing iron but no amine. In a different application, the initial oxidation of polyethylene can be used in order to increase its adhesion to cardboard. Excellent adhesion between polyethylene and cardboard is important for liquid packaging based on renewable resources. Amino-POSS has been chosen for food packaging applications due to its expected lower leakage from polyethylene (PE) compared with stearyl amine. Film samples of PE/amino-POSS/FeSt 3 blends were partly oxidized in a circulation oven. The oxidation was documented by Polymers 2015, 7 1523 increased carbonyl index (CI) and melt flow index (MFI). The limited extent of oxidation has been proved by unchanged tensile strength and only moderate changes in elongation at break when compared to reference polyethylene films containing no FeSt 3 or amino-POSS. The PE/amino-POSS/FeSt 3 blends were compression moulded to paperboard. The adhesion of non-aged blends to paperboard decreased with increasing amino-POSS content which is in good compliance with an earlier reported lubricant effect of high amounts of POSS in PE. Thermal ageing of PE/amino-POSS/FeSt 3 films prior to coating however led to a significant increase in adhesion. Improved physical interlocking due to increased MFI and interaction between C=O of the blends and OH of paperboard can explain the adhesion improvement. The films were not brittle after thermal ageing, which makes their use in industrial packaging feasible. A mechanism explaining the role of amines during thermal oxidation of polyolefins in the presence of iron is proposed.

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“…and concentrated phosphoric acid were used without further purification. Amine-POSS, a hybrid organic/inorganic polyhedral oligomeric silsesquioxanes (POSS), has been prepared by a solgel process as reported previously by our group [14].…”

Section: Introductionmentioning

confidence: 99%

Needleless electrospun nanofibers containing microcapsules: a methodology for self-supported microcontainers

Grandcolas¹,

Sunde²,

Pilz³

et al. 2017

IJERA

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The present paper investigates the facile production of electrospun polyvinyl alcohol (PVA) nanofibers containing either micro-sized polymer or hybrid capsules, using a needleless electrospinning system. Oilcontaining microcapsules with diameters of around 3 or 10 µm, respectively, were produced via an oil-in-water miniemulsion and mixed with a PVA solution. Appropriate adjustment of electrospinning parameters enabled a controlled assembly of PVA nanofibers into a network containing microcapsules, without damaging their integrity. The PVA nanofibers have diameters in a range of 200-300 nm and showed good homogeneity. The introduction of microcapsules caused an increase in the PVA nanofiber diameters probably due to an increase in the solution viscosity. The production of such self-supported and loaded microcontainers could be of high interest for various applications.

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Polymer nanocomposite coatings based on polyhedral oligosilsesquioxanes: route for industrial manufacturing and barrier properties

Cited by 21 publications

References 35 publications

New Antiadhesive Hydrophobic Polysiloxanes

New Antiadhesive Hydrophobic Polysiloxanes

Thermal Oxidation of Polyolefins by Mild Pro-Oxidant Additives Based on Iron Carboxylates and Lipophilic Amines: Degradability in the Absence of Light and Effect on the Adhesion to Paperboard

Needleless electrospun nanofibers containing microcapsules: a methodology for self-supported microcontainers

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