CROSS-LINKING OF NATURAL RUBBER WITH 1, 3-DIOXAN

Umrežavanje Prirodnog Kaučuka Cross-linking of Natural Rubber

Zahtjevi koji se postavljaju pred ploveće objekte nužno su doveli do primjene polimera kao konstrukcijskog materijala i kao suvremenog sustava zaštite u brodogradnji i pomorstvu. Prirodni kaučuk je poznat kao važan industrijski materijal koji se dobiva od drveta kaučukovca (Hevea brasiliensis). To je polimerni materijal, po kemijskom sastavu uglavnom cis 1,4-poliizopren, koji se ubraja u skupin...

Groningen Thermoreversible cross - linking of rubber

The Cyclization of Natural Rubber

The effects of solvent, temperature, time, weight percent of catalyst on the rate and mechanism of cyclization of natural rubber (NR) was studied in toluene and xylene solutions having tin tetra chloride catalyst (SnCl4). Iodometric titration show, with 8% SnCl4 (based on polymer weight) cyclization occurs, leaving 27.4% of the total unsaturation. Infrared spectra of c...

Chemical cross linking versus high energy electron beam cross linking of HDPE: electrical properties study

Cross linking of high density polyethylene (HDPE) was first performed via high energy10 Mev electron beam (EB) irradiation. HDPE was also cross linked withDicumyle peroxide (DCP).The gel content of samples was determined by solvent extraction.Degree of cross linking was evaluated by hot set apparatus; as well .In order to clarify the effectof nature of cross linking, correlation of electrical p...

Evaluation of Corneal Aberrometry Parameters Before and After Cross-Linking in Patients with Keratoconus

Background and Objective: In the last decade, cross-linking (CXL) has been widely used for treating people with progressive keratoconus. The present study aimed to compare corneal aberrometry parameters before and after CXL in patients with keratoconus. Materials and Methods: In this cross-sectional study, 67 patients with keratoconus referred to Farshchian Sina Medical Education Center, Hamad...