Internal Structure Changes of Nylon 12 in Balloon Forming Process

Abstract

Medical balloon has been widely used for the treatment of cardiovascular and cerebrovascular diseases, but the theoretical studies in processing process of medical balloon have reported less in the domestic. This paper briefly introduce in the processing process of medical balloon from the nylon 12 as raw materials, through control the conditions of primary molding, secondary molding and final molding process of the operating, then investigate the stress-strain curve of each sample in the molding process by Hydraulic Pressure Tester. And further investigated the material's lattice parameter, melting point, crystallinity and the structure changes of internal groups during the molding process separately by X-ray diffraction (XRD), differential scanning caborimetry (DSC) and infrared transmission spectroscopy (FTIR) experiment. It could be founded that the acting force between the polymeric chain of nylon 12 reduced at first, so that the material has better plasticity and machinability for forming, and then the acting force of polymer chain is enhanced, so that the final balloon has higher strength and stability were discovered during the balloon forming process.

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

“…It can be speculated that the absorption peaks near 692, 728, 764, and 835 nm are related to the vibrational absorption of methylene groups. The absorption peak near 940 nm is related to the vibrational absorption of amide groups 34 – 36 The absorption peaks of PA12 at different concentrations are located similarly.…”

“…The absorption peak near 940 nm is related to the vibrational absorption of amide groups. [34][35][36] The absorption peaks of PA12 at different concentrations are located similarly.…”