Some effects of foaming of the poly(butylene adipate‐co‐terephthalate) modified by electron radiation

Abstract

Investigation of the effect of electron radiation and foaming agent on some properties of poly(butylene adipate-co-terephthalate) (PBAT) was the aim of the present paper. The mass flow rate, weight-average molecular weight of irradiated PBAT as well as the morphological structure of foamed samples, their density, tensile strength, and specific strength were determined. It was found that irradiation of PBAT induces growth in weight-average molecular weight and decrease in mass flow rate, and as a consequence of this increase in viscosity of this polymer. It was also found that foaming of irradiated PBAT causes formation of homogeneous cellular structure or structure with a clear separation of large and small cells. Simultaneously, the irradiated and foamed PBAT shows smaller density than that of non-irradiated and foamed PBAT. Moreover, electron radiation does not influence tensile strength of the foamed PBAT; however, it increases its specific strength, although only if the content of foaming agent is 1 wt%.

The effects of electron beam radiation on material properties and degradation of commercial PBAT/PLA blend

“…16,28,29 Meanwhile, if the degradation process of PLA will dominate in the system, the M n will significantly decrease. According to the literature, in the case of crosslinked structure formation, the M n and Đ should increase with increasing radiation dose.…”

“…According to the literature, in the case of crosslinked structure formation, the M n and Đ should increase with increasing radiation dose. 16,28,29 Meanwhile, if the degradation process of PLA will dominate in the system, the M n will significantly decrease. 30 As evidenced by the data presented in Table I, the molecular weight of the irradiated and nonirradiated Ecovio films were very similar.…”

“…13,14 It combines good mechanical properties of Ecoflex and ability to fast degrade of PLA. 16 Therefore, the aim of the studies was to determine the structural changes of Ecovio material caused by irradiation at doses 5, 13, and 26 kGy. The aromatic domains present in the PBAT structure should partly preserve the material from degradation initiated by e-beam irradiation.…”

“…However, PLA is known as polymer highly susceptible for radiation, which causes worsening of processing properties and functional qualities. 16 Therefore, the aim of the studies was to determine the structural changes of Ecovio material caused by irradiation at doses 5, 13, and 26 kGy. The thermal, mechanical, morphological, barrier properties, and susceptibility to degradation were studied as a function of irradiation dose.…”

Effect of acetylated cellulose nanocrystals on solid‐state foaming behaviors of chain‐extended poly(butylene adipate‐co‐terephthalate)

“…Furthermore, the crystalline regions of PBAT matrix make it difficult for the foaming agent gas to diffuse and restrict the cell growth. [21] In recent years, various modifications of PBAT including chain extension, [22,23] blending, [24] filling, [25] and cross-linking [26,27] have been developed and reported to overcome the aforementioned drawbacks. In our previous study, [28] PBAT foams with obvious bimodal cellular structure was fabricated by utilizing a crystalline chain extender (ethylene-glycidyl methacrylate copolymer) and the batch supercritical CO 2 foaming technology at a relative low temperature (70, 74, 80, 86 C).…”