دراسة ثابت العزل الكهربائي والعوامل المؤثرة فيه لنسب مختلفة من خلطات بوليمرية

Abstract

The project involved the preparation of two-polymer blends of high density polyethylene (HPE) and high impact polystyrene (HIPS), with (HIPS) content: (0wt%, 15wt%, 35wt%, 50wt%, 100wt%). For purpose, a single-screw extruder is used in test-sample preparation, followed by use the hot-press several plates extruded a long opposite direction.A comparison is made between properties of blends with those of high density polyethylene (HPE) and high impact polystyrene (HIPS) with aim of arriving at the best physical mixing percentage. The results of comparison have clearly shown that the increasing of content of (HIPS) in (HPE- HIPS) blend after limit ratio deter mind (35wt%) in material prepare lead to negative effect.Then study relation between dielectric constant (εr) and frequency and temperature and percentage moisture absorption. It was found that dielectric constant increases when the temperature and percentage moisture absorption increases, where as dielectric constant (εr) dependent on capacity of prepare polymer blends.The % moisture show the lower value for (HPE- HIPS) blend having (HIPS) content (35wt%).