The observation of PP/EVA blends in which isotactic PP was preradiated with different radiation absorbed doses

Abstract

Isotactic polypropylene (PP) was preradiated by γ ray with different absorbed doses and subsequently blended with ethylene‐vinyl acetate (EVA) co‐polymer to prepare PP/EVA blends. The average molecular weight (Mn) of isotactic PP decreased with the increasing radiation absorbed dose, which indicated that high energy radiation of γ ray broke the isotactic long PP chains into shorter ones. The melt flow rate results evidenced that the processing ability of PP/EVA blends was continuously promoted with the increasing absorbed dose. The β crystal was obtained in the PP/EVA blends by the radiation method. The onset temperatures and peaks of crystallization of PP/EVA blends decreased slightly with the increasing radiation absorbed dose, while high energy radiation was inclined to enhance the crystallinity of PP/EVA blends. The Fourier transform infrared spectroscopy (FTIR) tests confirmed an interesting phenomenon that PP tended to move to the surface of the PP/EVA blends with the increasing radiation absorbed dose. Mechanical tests proved that the PP/EVA blends remained a comparative stable mechanical property under the absorbed dose of 30 kGy. The experimental results indicated that PP/EVA blend was a potential candidate for industrial applying. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45057.

Electron beam irradiation influencing the mechanical properties and water absorption of polycaprolactam (PA6) and polyhexamethylene adipamide (PA66)

“…Therefore, electron beam irradiation technology has been widely used in the modications of polymers. [14][15][16] Sengupta and co-workers 17 prepared PA66 lm by slice compression molding method and then studied the performances of the sample aer irradiation. It was found in the experiment that the crystallinity of the PA lm aer irradiation initially decreased rapidly with the increase of the irradiation dose and then the decreasing speed slowed down.…”

Processing and characterization of polypropylene (PP)/ethylene–vinyl acetate (EVA) blend-based glassy carbon (GC) composites

“…Polymer blends allow joining the best properties of two or more different polymers (or copolymers) in a new material, bypassing some disadvantages of applying the neat material, for example, low impact strength, thermal properties or low capacity in loading some fillers. Polypropylene (PP) and polypropylene based-blends are the main polymers used for packaging [19][20][21], textile industry and household appliances [22]. The advantage of PP is correlated to ease of processing, low cost, reasonable mechanical properties as well as good recyclability.…”

“…The olefinic polymers applied to blend with PP to modify its impact strength are copolymers based on ethylene, like ethylene-vinyl acetate (EVA), which is also a low-cost polyolefin [22,25,26]. The contribution of EVA to improve the impact strength of PP has been proved [20,[25][26][27] such as the immiscibility between both polymers, due to their completely different chemical structures [25,26,28]. To overcome this problem, the addition of a compatibilizer agent may improve the interfacial adhesion between the PP and EVA phases, modifying its morphology, hence increasing the mechanical properties of the PP/EVA blend [26,29].…”