High‐frequency welding of thermoplastic LLDPE/PA 6/PE‐g‐MAH ternary blends

Abstract

High frequency (HF) welding of linear low density polyethylene (LLDPE) melt blends with polyamide 6 (PA6) was done at 27.12 MHz using maleic anhydride grafted polyethylene (PE-g-MAH) as compatibilizer. HF welding was not possible for the blends at room temperature, but possible at higher temperatures (50, 808C) although the maximum relaxation frequency was lower than the operating frequency. Greater dielectric constant, dissipation factor, and welding performance were obtained when PA 6 was premixed with PE-g-MAH rather than the one-shot process where all the components were mixed simultaneously. This was interpreted in terms of lowered viscosity of PA 6 phase, which encapsulates the flow effectively and provides great skin effect. Also, the peeling force of resin-resin was greater than resin-nylon mesh due to the higher melting temperature and vacancy of nylon mesh.

Simulative study of polymeric core–shell foam particles for the enlargement of the material portfolio in 3‐D high‐frequency welding

“…A material's ability to generate heat inside an electric field is dependent on its chemical structure and, thus, the presence of dipoles. [ 11 ] The heating inside the electric field is caused by an ongoing reorientation of dipoles and, therefore, heat generation caused by inner friction. [ 12 ] In the case of polymers with symmetric chemical structures, for example, polyethylene, the formation of permanent dipoles is not possible.…”

RF Welding of Dielectric Lossless Foam Particles by the Application of a Dielectric Heatable Coating with High Recycling Potential

“…The proportion of converted electrical energy into thermal energy can be described by the dielectric loss factor. It is influenced by the chemical structure and the presence of dipoles in the polymer [13], the prevailing temperature, as well as the frequency of the applied field. It may also be influenced by newly introduced fillers [14].…”

Preparation of compatibilizer with large specific surface and its application in immiscible polymer blends with ultra‐high molecular weight

“…Generally, the added copolymers are compatible with the two phases, thereby segregating preferentially at the interface and ensuring strong interfacial adhesion. A typical example of this strategy is to use the grafted polyolefin such as maleic anhydride grafted polyolefin (PO‐ g ‐MAH) or glycidyl methacrylate grafted polyolefin (PO‐ g ‐GMA) to compatibilize polyamide/polyolefin (PA/PO) blends , which was processed by melt blending in a double screw extruder and achieved excellent thermal stability and mechanical strength. However, for MC nylon prepared by in situ polymerization of caprolactam, achieving enhanced properties of MC nylon/UHMWPE blends seems to be a formidable challenge.…”