Synthesis and surface activity of high and low surface energy multi-end functional polybutadiene additives

Soft Matter ◽  
2012 ◽  
Vol 8 (12) ◽  
pp. 3487 ◽  
Author(s):  
Solomon M. Kimani ◽  
Sarah J. Hardman ◽  
Lian R. Hutchings ◽  
Nigel Clarke ◽  
Richard L. Thompson
Keyword(s):  
Surface Energy ◽  
Surface Activity ◽  
Low Surface Energy

scholarly journals Influence of PVAc/PVA Hydrolysis on Additive Surface Activity

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 205 ◽  
Author(s):  
Ophélie Squillace ◽  
Rebecca Fong ◽  
Oliver Shepherd ◽  
Jasmine Hind ◽  
James Tellam ◽  
...  
Keyword(s):  
Surface Energy ◽  
Surface Activity ◽  
Polymer Matrix ◽  
Surface Segregation ◽  
High Surface ◽  
Sodium Dodecyl ◽  
Degree Of Hydrolysis ◽  
Low Surface Energy ◽  
Wide Range ◽  
The Matrix

This aims to establish design rules for the influence of complex polymer matrices on the surface properties of small molecules. Here, we consider the dependence of the surface behaviour of some model additives on polymer matrix hydrophobicity. With stoichiometric control over hydrolysis, we generate systematic changes in matrix chemistry from non-polar, hydrophobic PVAc to its hydrolysed and hydrophilic analogue, PVA. With the changing degree of hydrolysis (DH), the behaviour of additives can be switched in terms of compatibility and surface activity. Sorbitol, a polar sugar-alcohol of inherently high surface energy, blooms to the surface of PVAc, forming patchy domains on surfaces. With the increasing DH of the polymer matrix, its surface segregation decreases to the point where sorbitol acts as a homogeneously distributed plasticiser in PVA. Conversely, and despite its low surface energy, octanoic acid (OA) surprisingly causes the increased wettability of PVAc. We attribute these observations to the high compatibility of OA with PVAc and its ability to reorient upon exposure to water, presenting a hydrophilic COOH-rich surface. The surfactant sodium dodecyl sulfate (SDS) does not show such a clear dependence on the matrix and formed wetting layers over a wide range of DH. Interestingly, SDS appears to be most compatible with PVAc at intermediate DH, which is consistent with the amphiphilic nature of both species under these conditions. Thus, we show that the prediction of the segregation is not simple and depends on multiple factors including hydrophobicity, compatibility, blockiness, surface energy, and the mobility of the components.

Cytocompatibility of Carbon Nanofiber Materials for Neural Applications

2003 ◽  
Vol 774 ◽  
Author(s):  
Janice L. McKenzie ◽  
Michael C. Waid ◽  
Riyi Shi ◽  
Thomas J. Webster
Keyword(s):  
Carbon Fiber ◽  
Surface Energy ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Carbon Nanofiber ◽  
Fiber Composite ◽  
Scar Tissue ◽  
Pc 12 Cells ◽  
Low Surface Energy ◽  
Poly Carbonate

AbstractSince the cytocompatibility of carbon nanofibers with respect to neural applications remains largely uninvestigated, the objective of the present in vitro study was to determine cytocompatibility properties of formulations containing carbon nanofibers. Carbon fiber substrates were prepared from four different types of carbon fibers, two with nanoscale diameters (nanophase, or less than or equal to 100 nm) and two with conventional diameters (or greater than 200 nm). Within these two categories, both a high and a low surface energy fiber were investigated and tested. Astrocytes (glial scar tissue-forming cells) and pheochromocytoma cells (PC-12; neuronal-like cells) were seeded separately onto the substrates. Results provided the first evidence that astrocytes preferentially adhered on the carbon fiber that had the largest diameter and the lowest surface energy. PC-12 cells exhibited the most neurites on the carbon fiber with nanodimensions and low surface energy. These results may indicate that PC-12 cells prefer nanoscale carbon fibers while astrocytes prefer conventional scale fibers. A composite was formed from poly-carbonate urethane and the 60 nm carbon fiber. Composite substrates were thus formed using different weight percentages of this fiber in the polymer matrix. Increased astrocyte adherence and PC-12 neurite density corresponded to decreasing amounts of the carbon nanofibers in the poly-carbonate urethane matrices. Controlling carbon fiber diameter may be an approach for increasing implant contact with neurons and decreasing scar tissue formation.

Corrigendum to “Fabrication superhydrophobic composite membranes with hierarchical geometries and low-surface-energy modifications” [Polymer 211 (2020) 123097]

Polymer ◽  
2021 ◽  
Vol 217 ◽  
pp. 123481
Author(s):  
Zhanhui Gan ◽  
Deyu Kong ◽  
Qianqian Yu ◽  
Yifan Jia ◽  
Xue-Hui Dong ◽  
...  
Keyword(s):  
Surface Energy ◽  
Composite Membranes ◽  
Low Surface Energy

scholarly journals Automated pick-and-place of single nanoparticle using electrically controlled low-surface energy nanotweezer

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035219
Author(s):  
Ya-Kun Lyu ◽  
Zuo-Tao Ji ◽  
Tao He ◽  
Zhenda Lu ◽  
Weihua Zhang
Keyword(s):  
Surface Energy ◽  
Low Surface Energy ◽  
Single Nanoparticle ◽  
Pick And Place

scholarly journals Low Surface Energy Polymeric Films from Novel Fluorinated Blocked Isocyanates

2004 ◽  
Vol 37 (2) ◽  
pp. 408-413 ◽  
Author(s):  
L. van Ravenstein ◽  
W. Ming ◽  
R. D. van de Grampel ◽  
R. van der Linde ◽  
G. de With ◽  
...  
Keyword(s):  
Surface Energy ◽  
Polymeric Films ◽  
Low Surface Energy

scholarly journals A Novel Synthetic UV-Curable Fluorinated Siloxane Resin for Low Surface Energy Coating

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 979 ◽  
Author(s):  
Chunfang Zhu ◽  
Haitao Yang ◽  
Hongbo Liang ◽  
Zhengyue Wang ◽  
Jun Dong ◽  
...  
Keyword(s):  
Surface Energy ◽  
Photoelectron Spectroscopy ◽  
Contact Angles ◽  
Proton Nuclear Magnetic Resonance ◽  
Energy Materials ◽  
Uv Curable ◽  
X Ray ◽  
Low Surface Energy ◽  
Low Concentrations ◽  
Siloxane Polymers

Low surface energy materials have attracted much attention due to their properties and various applications. In this work, we synthesized and characterized a series of ultraviolet (UV)-curable fluorinated siloxane polymers with various fluorinated acrylates—hexafluorobutyl acrylate, dodecafluoroheptyl acrylate, and trifluorooctyl methacrylate—grafted onto a hydrogen-containing poly(dimethylsiloxane) backbone. The structures of the fluorinated siloxane polymers were measured and confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. Then the polymers were used as surface modifiers of UV-curable commercial polyurethane (DR-U356) at different concentrations (1, 2, 3, 4, 5, and 10 wt %). Among three formulations of these fluorinated siloxane polymers modified with DR-U356, hydrophobic states (91°, 92°, and 98°) were obtained at low concentrations (1 wt %). The DR-U356 resin is only in the hydrophilic state at 59.41°. The fluorine and siloxane element contents were investigated by X-ray photoelectron spectroscopy and the results indicated that the fluorinated and siloxane elements were liable to migrate to the surface of resins. The results of the friction recovering assays showed that the recorded contact angles of the series of fluorinated siloxane resins were higher than the original values after the friction-annealing progressing.

Superhydrophobic polyaniline hollow spheres with mesoporous brain-like convex-fold shell textures

2015 ◽  
Vol 3 (38) ◽  
pp. 19299-19303 ◽  
Author(s):  
Ruixia Yuan ◽  
Huaiyuan Wang ◽  
Tuo Ji ◽  
Liwen Mu ◽  
Long Chen ◽  
...  
Keyword(s):  
Surface Energy ◽  
Phase Transfer ◽  
Hollow Spheres ◽  
Perfluorooctanoic Acid ◽  
Porous Structures ◽  
Low Surface Energy ◽  
Transfer Method ◽  
Ordered Porous

A novel micelle-mediated phase transfer method is developed to synthesize hollow polyaniline spheres with mesoporous brain-like convex-fold shell textures. High superhydrophobicity is achieved due to the highly ordered porous structures and low surface energy provided by perfluorooctanoic acid.

Improvement of anti-icing properties of low surface energy coatings by introducing phase-change microcapsules

2017 ◽  
Vol 58 (6) ◽  
pp. 973-979 ◽  
Author(s):  
Kongying Zhu ◽  
Xiaohui Li ◽  
Junfeng Su ◽  
Hui Li ◽  
Yunhui Zhao ◽  
...  
Keyword(s):  
Surface Energy ◽  
Phase Change ◽  
Low Surface Energy
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