Preparation and properties of cyclo‐olefin copolymer/titania hybrids

Abstract

A series of organic-inorganic hybrid materials consisting of an organic cyclo-olefin copolymer (COC) and inorganic titania (TiO 2 ) were successfully synthesized by a sol-gel process. TiO 2 was obtained through the hydrolysis of titanium n-butoxide (TNBT) with the catalysis of HCl. Differential scanning calorimetry analysis indicated that the glass-transition temperature of the hybrids was higher than that of pure COC, and it rose significantly as the TNBT content was increased from 1 to 15 wt %. Scanning electron microscopy observations showed that the morphology of fractured surfaces of the COC/TiO 2 hybrid with 5 wt % TNBT was a single homogeneous phase, indicating that the miscibility between COC and TiO 2 was good for the hybrids. According to ultraviolet-visible analysis, the transmittance of pure COC at 550 nm was high up to 91.7%. The light transmittance of the COC/TiO 2 hybrids was still higher than 80% with the TNBT content up to 5 wt %. The decomposition temperatures of the hybrids, investigated with thermogravimetric analysis, were not affected significantly by the addition of TNBT. The oxygen barrier property of the hybrid films showed significant improvements in comparison with pure COC.

Fabrication of superhydrophobic transparent cyclic olefin copolymer (COC)‐SiO2 nanocomposite surfaces

“…49,53 There are studies that prepare nanocomposites by using COC and metal particles to improve especially mechanical or some other properties of polymers. 54,55 Ma et al used low-temperature sputtering technique to produce COC hydrophilic SiO 2 composites. They changed the surface wettability from hydrophobic to hydrophilic-changed the contact angle from 100.5 0 to 17 0 -by adding hydrophilic SiO 2 particles.…”

“…Its light transmittance is as high as PMMA and PC 49,53 . There are studies that prepare nanocomposites by using COC and metal particles to improve especially mechanical or some other properties of polymers 54,55 . Ma et al used low‐ temperature sputtering technique to produce COChydrophilic SiO 2 composites.…”

Cyclo‐olefin copolymer/poly(acrylonitrile‐butadiene‐styrene) blends: Structure–property relationships and morphological, rheological, and mechanical properties

“…With these variable (or adjustable) properties, COC resins can be used in a wide variety of applications requiring different thermal and mechanical properties such as electrical-electronics applications, optics, and lighting, products for construction, medical, and packaging applications. In the literature, many studies have examined the mechanical, [35,36] rheological, [35,36] and physical properties [37,38] of blends of COCs prepared with different polymers, composites prepared with organic/inorganic fillers, [39,40] and derivatives with different chemical structures. [41,42] It is clear that COCs that do not contain a harmful component, such as bisphenol A, are a good alternative to polycarbonate or other amorphous polymers.…”