𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The surface treatment of polypropylene molds and its effect on the quality of cast contact lenses

✍ Scribed by Dr. J. Lukášk; T. Fenclová; V. Tyráčkková; J. Vacík

Publisher
Wiley (John Wiley & Sons)
Year
1992
Tongue
English
Weight
534 KB
Volume
3
Category
Article
ISSN
1045-4861

No coin nor oath required. For personal study only.

✦ Synopsis

An investigation of the surface by XPS photoelectron spectroscopy has shown that the process of production of cast contact lenses based on poly(2-hydroxyethyl methacrylateco-diethyleneglycol methacrylate) is accompanied by mass transfer at the lens-mold boundary. This phenomenon, which impairs the compatibility of the lens during its application, can be considerably suppressed by employing a suitable surface modification of polypropylene molds. The surface treatment consisting in the oxidation of the mold surface by an AC corona discharge in the oxygen atmosphere increases hydrophilicity of the material, thus facilitating separation of the lens from the mold. The results of the XPS study were also confirmed microscopically by employing the SEM method. 0 1992

📜 SIMILAR VOLUMES

Effect of surface treatment on the prope
Effect of surface treatment on the properties of polypropylene/nanoboehmite composites
✍ David Bravet; Olivier Guiselin; Gwo Swei 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 704 KB

Boehmite nanoparticles are surface modified with alkyl phosphorous acid to improve their dispersion in polypropylene. Effective grafting is evidenced by NMR, elemental analysis and by the fact that the dispersion ability (or disagglomeration) of grafted boehmite particle in nonpolar solvent is signi

Effect of DC glow discharge treatment on
Effect of DC glow discharge treatment on the surface energy and surface resistivity of thin film of polypropylene
✍ Rajesh Kumar; Raj Kumar Singh; Manoj Kumar; Sudhir Kumar Barthwal 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 442 KB 👁 2 views

## Abstract A change in the surface energy and surface resistivity of a thin film of polypropylene (PP) of thickness 100 μm was investigated, using direct current (DC) glow discharge. The thin film of the PP was treated for various discharge powers and treatment time and the modification in the sur

Ultrathin coating of plasma polymer of m
Ultrathin coating of plasma polymer of methane applied on the surface of silicone contact lenses
✍ Ho, Chung-Peng ;Yasuda, H. 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 885 KB

Silicone rubber has great advantages as a contact lens material because of its very high oxygen permeability, softness, and excellent mechanical strength and durability. Practical application is hampered by inherent characteristics of elastomers, i.e., high tackiness and highly hydrophobic surface p

Dynamic mold surface temperature control
Dynamic mold surface temperature control using induction heating and its effects on the surface appearance of weld line
✍ Shia-Chung Chen; Wen-Ren Jong; Jen-An Chang 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 780 KB

## Abstract Electromagnetic induction heating combined with coolant cooling is used to achieve dynamic mold surface temperature control. A simulation tool was also developed by integration of both thermal and electromagnetic analysis modules of ANSYS, and capability and accuracy were verified exper

Effect of filler content and surface tre
Effect of filler content and surface treatment on the tensile properties of glass-bead-filled polypropylene composites
✍ Liang, J?Z; Li, R?K?Y 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 192 KB 👁 2 views

The tensile properties of polypropylene (PP) ®lled with two A-glass beads with the same size, PP/3000 (glass bead surface pretreated with a silane coupling agent) and PP/3000U (no surface pretreatment), have been measured by using an Instron materials testing machine at room temperature, to identify