Etching and structure transformations in uncured epoxy resin under rf-plasma and plasma immersion ion implantation

Kondyurin, Alexey; Bilek, M.M.M.

doi:10.1016/j.nimb.2010.03.014

Cited by 15 publications

(4 citation statements)

References 23 publications

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“…This sample must contain silicon because the thickness of the residual silk layer (7 nm) is much less than the penetration depth of the nitrogen ions, and the penetration of ions into the substrate results in interfacial mixing. Similar changes in refractive index with PIII treatment have been observed for polystyrene, 43 epoxy resin, 44 PMMA, 45 and polycarbonate. 42 The increase in the refractive index in all of these cases is due to carbonization of the PIII treated polymer.…”

Section: Resultssupporting

confidence: 76%

Plasma Ion Implantation of Silk Biomaterials Enabling Direct Covalent Immobilization of Bioactive Agents for Enhanced Cellular Responses

Kondyurin

Lau

Tang

et al. 2018

ACS Appl. Mater. Interfaces

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Silk fibroin isolated from Bombyx mori cocoons is a promising material for a range of biomedical applications, but it has no inherent cell-interactive domains, necessitating functionalization with bioactive molecules. Here we demonstrate significantly enhanced cell interactions with silk fibroin biomaterials in the absence of biofunctionalization following surface modification using plasma immersion ion implantation (PIII). Further, PIII treated silk fibroin biomaterials supported direct covalent immobilization of proteins on the material surface in the absence of chemical cross-linkers. Surface analysis after nitrogen plasma and PIII treatment at 20 kV revealed that the silk macromolecules are significantly fragmented, and at the higher fluences of implanted ions, surface carbonization was observed to depths corresponding to that of the ion penetration. Consistent with the activity of radicals created in the treated surface layer, oxidation was observed on contact with atmospheric oxygen and the PIII treated surfaces were capable of direct covalent immobilization of bioactive macromolecules. Changes in thickness, amide and nitrile groups, refractive index, and extinction coefficient in the wavelength range 400-1000 nm as a function of ion fluence are presented. Reactions responsible for the restructuring of the silk surface under ion beam treatment that facilitate covalent binding of proteins and a significant improvement in cell interactions on the modified surface are proposed.

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Section: Resultssupporting

confidence: 76%

Plasma Ion Implantation of Silk Biomaterials Enabling Direct Covalent Immobilization of Bioactive Agents for Enhanced Cellular Responses

Kondyurin

Lau

Tang

et al. 2018

ACS Appl. Mater. Interfaces

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“…The booming aerospace, marine, and ordnance industries urgently need new lightweight materials with high specific strength, specific modulus, fatigue resistance and thermal performance . Epoxy has the advantages of being transparent, light, and with high cohesion strength.…”

Section: Introductionmentioning

confidence: 99%

Synergistic reinforcement of epoxy/basalt fiber composites with dimensionally different nanoparticles

et al. 2018

Polymer Engineering & Sci

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Epoxy/basalt fiber composites were modified by 2D montmorillonite (MMT), 0D nanoSiO2, or 2D MMT/ 0D nanoSiO2 double nanoparticles. Mechanical tests showed that all the modified composites had considerably improved interlaminar shear strength and notch impact strength compared with the unmodified epoxy/basalt fiber composites, and that the double nanoparticle‐modified composites displayed the greatest improvement. X‐ray diffraction, transmission electron microscopy, and scanning electron microscopy revealed that co‐addition of 2D MMT and 0D nanoSiO2 into epoxy/basalt fiber composites produced a unique microstructure. The MMT was completely exfoliated into nanoscale mono‐sheets and interacted with nanoSiO2 particles to assemble into networks. The networks trapped many epoxy molecules within them and they tightly surrounded basalt fibers to form buffer layers. These results indicate that double nanoparticles of different dimensionality promote epoxy molecules to infiltrate between, combine with and coat basalt fibers more effectively than single nanoparticles, which facilitates better cooperation of epoxy and basalt fibers in resisting external forces. Modification with dimensionally different nanoparticles is an effective pathway to improve the performance of epoxy/basalt fiber composites and broaden their application fields. POLYM. ENG. SCI., 59:730–735, 2019. © 2018 Society of Plastics Engineers

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“…Moreover, the bands at 1047, 1195, and 1289 cm –1 in this region were associated with C–O group stretching motions. Furthermore, the appearance of new bands in the middle-frequency region (1500–1800 cm –1 ) resulted from the stretch vibration of carbonyl groups and unsaturated CC bonds . In particular, the presence of bands within the range from 1720 to 1750 cm –1 was from postoxidation of PPC films and formation of new carbonyl bonds .…”

Section: Results and Discusionmentioning

confidence: 98%

“…Furthermore, the appearance of new bands in the middle-frequency region (1500−1800 cm −1 ) resulted from the stretch vibration of carbonyl groups and unsaturated CC bonds. 44 In particular, the presence of bands within the range from 1720 to 1750 cm −1 was from postoxidation of PPC films and formation of new carbonyl bonds. 45 The two negative bands at 1219 and 1734 cm −1 in spectra were due to the degradation of C−O and CO bonds and structural transformation.…”

Section: Results and Discusionmentioning

confidence: 99%

Fabrication of Antimicrobial Poly(propylene carbonate) Film by Plasma Surface Modification

Bahramian

Chrzanowski

Kondyurin

et al. 2017

Ind. Eng. Chem. Res.

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Plasma coating was used as a green process for immobilization of thymol, a natural antimicrobial compound, on the surface of poly(propylene carbonate) (PPC). PPC is a partially renewable polymer that is synthesized from CO 2 and degrades into benign products including water and CO 2 and has superior properties for broad ranges of applications. The results of FTIR and water contact angle analyses demonstrated that plasma treatment was efficient for functionalization of PPC and immobilizing thymol. Plasma treatment of the PPC surface reduced thymol elution in 90% alcohol from 60% to 20% (P < 0.05). Maximum antimicrobial activity was achieved with highintensity plasma for 15 min and 1.25 mg/cm 2 thymol as shown by antibacterial and biofilm formation assays. In aqueous media, the antimicrobial activity of coated PPC was maintained for 7 days, while under dry conditions it was preserved for several months. In conclusion, plasma modification was an efficient technique for the fabrication of antimicrobial PPC and it will broaden the application of this polymer for fabrication of biomedical devices and food packaging to decrease the risk of microbial contamination and prolong their shelf life.

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Etching and structure transformations in uncured epoxy resin under rf-plasma and plasma immersion ion implantation

Cited by 15 publications

References 23 publications

Plasma Ion Implantation of Silk Biomaterials Enabling Direct Covalent Immobilization of Bioactive Agents for Enhanced Cellular Responses

Plasma Ion Implantation of Silk Biomaterials Enabling Direct Covalent Immobilization of Bioactive Agents for Enhanced Cellular Responses

Synergistic reinforcement of epoxy/basalt fiber composites with dimensionally different nanoparticles

Fabrication of Antimicrobial Poly(propylene carbonate) Film by Plasma Surface Modification

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