Modulus and hardness evaluation of polycrystalline superconductors by dynamic microindentation technique

Micro-hardness of surface layer of irradiated Polybutene Terephthalate (PBT)

“…Poisson's ratio (ν) of the polymer was 0.3. The indentation hardness (H IT ) was calculated as maximum load (F max ) to the projected area of the hardness impression (A p ) according to: [7][8][9][10][11][12][13][14][15][16][17] …”

“…270°C), allowing PBT to be processed at lower temperatures. In addition, PBT has a lower glass transition temperature, a faster crystallization rate [1][2][3][4][5][6][7][8].…”

“…Among these reactive modifiers, core-shell structured particles functionalized with epoxy groups were usually chosen for PBT blend systems. Therefore, many research efforts have been put into improving the impact strength of PBT [3][4][5][6][7][8][9][10]. The principle of the radiation process is the ability of the high energy radiation to produce reactive cationts, anoints and free radicals in the material.…”

“…The industrial application of the radiation process (Figure 1 The aim of this paper is to study the effect of ionizing radiation with different doses, on microhardness of surface layer of PBT and compare these results with those of non-irradiated samples. The study is carried out due to the ever-growing employment of this type of polymer PBT [3][4][5][6][7][8][9][10].…”

Mechanical properties of surface layer of unfilled polypropylene

“…This is used in many applications such as radiation-sterilized medical and pharmaceutical components, food packaging materials and cosmetics [5]. A literature survey [6][7][8][9][10][11] indicates that effects of 14.89 MeV electron irradiation on polyethylene and polystyrene in the dose range of 57.6-576 KGy showed a greater red shift in absorption edge of polyethylene as compared to polystyrene [6]. Whereas, the enhancement in the thermal properties, dielectric constant, dielectric loss and crystallinity of 2 MeV and 1.5 MeV electron irradiated polypropylene has also shown considerable modifications [7,8].…”