Loss and recovery in hydrophobicity of silicone rubber exposed to corona discharge

Zhu, Yong; Otsubo, Masahisa; Honda, C.; Tanaka, Shou

doi:10.1016/j.polymdegradstab.2005.10.014

Cited by 74 publications

(44 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has been shown that diffusion of hydrophobic linear LMW silicon molecules from the bulk to the surface of the plastic could increase the contact angle. [6][7][8][9][10] The slight decrease of the contact angle could be a result of decrosslinking and chain scissions on the surface. Degradation of silicone rubbers in a strongly acidic environment, 3 which is present inside the human body, predominantly occurs through hydrolysis.…”

Section: Resultsmentioning

confidence: 99%

“…Chain scission results in loss of hydrophobicity (since hydrophilic groups are formed) and the migrating LMW compounds are responsible for the hydrophobic recovery of the surface. [6][7][8][9][10] These LMW compounds were found to be linear PDMS with methyl and/or hydroxyl end groups. 11,12 In medical use of silicone rubber there are two factors which are the main reasons for degradation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of biomedical polydimethylsiloxanes during exposure to in vivo biofilm environment monitored by FE‐SEM, ATR‐FTIR, and MALDI‐TOF MS

Kaali

Momcilovic

Markström

et al. 2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polymers used for biomedical purposes in medical devices are usually requested to be inert to degradation. This article describes that slow irreversible changes were observed in silicone surfaces exposed to in vivo biofilms even if silicone, in general, is supposed to have excellent long-term properties. Tracheostomy tubes made of silicone rubber were exposed to in vivo biofilm environments in clinical tests for periods of 1, 3, and 6 months. The chemical degradation was monitored by MALDI-TOF MS, ATR-FTIR, and FE-SEM. In addition, the physical changes were monitored by contact angle and hardness measurements. Cyclic polydimethylsiloxane (PDMS) was detected on the surfaces of new (unaged) silicones. On the surfaces of the in vivo samples new compounds, presumably linear methyl-hydroxyl-terminated PDMS, were detected in addition to cyclic PDMS. These compounds may be formed as a result of the hydrolysis of linear dimethyl terminated PDMS, which is also present in the silicone rubber. ATR-FTIR spectroscopy confirmed that hydrolysis had indeed occurred during the in vivo exposure, since SiAOH groups were detected. Furthermore, significant changes in the topography were detected by FE-SEM, indicating the initiation of degradation. No significant changes in the contact angle of the in vivo used samples were observed, but this information may be shielded by the fact that biofilm may remain on the surface, despite the thorough cleaning before the analysis. It is also possible that the surface hydrophobicity was recovered by the diffusion of linear low-molecular-weight compounds from the bulk.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation of biomedical polydimethylsiloxanes during exposure to in vivo biofilm environment monitored by FE‐SEM, ATR‐FTIR, and MALDI‐TOF MS

Kaali

Momcilovic

Markström

et al. 2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…5. The discharge photographs were taken at an interval of 1 ms, and the exposure time was 1/1000 s. From these photograph, some white eroded material (silica) [15] can be found on the eroded sample surface, which were byproducts caused by heating from the arc channel. The intensity of optical emission of the partial arc discharge at the cathode spot in the case of 0.8 mS/cm was strong.…”

Section: Resultsmentioning

confidence: 99%

Studies on erosion of silicone rubber exposed to partial arc discharges

Haji

Zhu

Otsubo

et al. 2008

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

“…This fact seems to confirm that a surface modification is taking place with the APPT treatment, eliminating methyl groups from the surface by linkage scission or reorienting them to the bulk. Zhu et al explained the elimination of methyl groups on silicone surfaces subjected to corona discharge [19] by the fact that the energy of part of the plasma photons is larger than the binding energy of the Si-O-Si and Si-CH 3 linkages. The reorientation of these groups to the bulk is explained on the basis of hydrophobic recovery, encouraging Si-CH 3 to remain on the surface and for oxidized species to re-orient.…”

Section: Chemical Modification Analysis By Atr-ftir and Xpsmentioning

confidence: 99%

Atmospheric Pressure Plasma Hydrophilic Modification of a Silicone Surface

Encinas

Dillingham

Oakley

et al. 2012

The Journal of Adhesion

View full text Add to dashboard Cite

A b e n o j a r , M . A . M a r t í n e z , a n d M . P a n t o j a. A tm o s p h e r i c p r e s s u r e p l a sm a h y d r o p h i l i c m o d i f i c a t i o n o f a s i l i c o n e s u r f a c e , P r e s e n t e d i n p a r t a t t h e 1 s t I n t e r n a t i o n a l C o n f e r e n c e o n S t r u c t u r a l A d h e s i v e B o n d i n g ( A B 2 0 1 1 ) , P o r t o , P o r t u g a l , 7 -8 J u l y 2 0 1 1 .

show abstract

Loss and recovery in hydrophobicity of silicone rubber exposed to corona discharge

Cited by 74 publications

References 7 publications

Degradation of biomedical polydimethylsiloxanes during exposure to in vivo biofilm environment monitored by FE‐SEM, ATR‐FTIR, and MALDI‐TOF MS

Degradation of biomedical polydimethylsiloxanes during exposure to in vivo biofilm environment monitored by FE‐SEM, ATR‐FTIR, and MALDI‐TOF MS

Studies on erosion of silicone rubber exposed to partial arc discharges

Atmospheric Pressure Plasma Hydrophilic Modification of a Silicone Surface

Contact Info

Product

Resources

About