Surface modification of granules of polyethylene terephthalate by fluorine-containing urethanes

Structural-morphological characteristics and properties of fluorine-containing surface-modified poly(ethylene terephthalate) films

“…, It was found that addition of PFA considerably increases the degree of crystallinity of PET (the known structures belonging to the triclinic syngony have been identified [2,6]) and the corresponding crystallite size in crystallographic directions 100 and 010 (Table 1), while the starting PET is characterized only by an amorphous halo.…”

“…The use of poly(ethylene tereph thalate) (PET) films to produce materials for a wide range of applications (packaging, electrical engineer ing and electronics, gas separation, and track edged membranes) require special methods for PET stabili zation, which cannot be achieved at present using the available surface or bulk modification with organic and mineral compounds [1][2][3]. In this context, poly and perfluorinated compounds are of certain interest, since they allow one to significantly improve a number of properties (thermal and light resistance, hydrolytic stability) of heterochain polymers when used even at low concentrations (10 -3 -5 wt %) [4][5][6][7][8][9][10][11][12][13][14]. Mean while, fluorinated alcohols used to synthesize modi fied PET are poorly esterified with acids; this impedes industrial production of polyester with improved properties [4,5,15].…”

Dose Dependences of the Mechanical Strength of Polymer Materials

“…At the same time, for the dose interval of 10 4 -10 6 Gy there is a significant difference in σ, most of which occurs at the temperature T = 293 K. With increasing T σ decreases. It can be established from the data and analysis, that the effect of irradiation on strength and inelastic properties of polymers is significant, and first of all, it affects the amorphous phase of the material [9][10][11]. The structure of Mylar has a complex heterogeneous structure of the amorphous regions, with a significant share of interfibrilic amorphous regions separating adjacent microfibrils, along with infibrilic amorphous layers [12,13].…”