Solvent-induced crystallization of amorphous poly(ether ether ketone) by acetone

Preparation and characterization of uniaxial poly(lactic acid)-based self-reinforced composites

“…However, the PLLA fibers only showed a melting peak, without a relaxation peak at T g or T c after ethyl acetate treatment, which confirmed the increase in the crystallinity of PLLA fibers after ethyl acetate treatment. These results indicate that some PLLA chains were dissolved, and that the amorphous phase was partially transformed into crystalline phase in the presence of ethyl acetate [22,23]. It can be seen that the melting peak remained constant after ethyl acetate treatment,…”

Properties of treated papers and plastic film influencing ethyl ester transfer

“…Such phenomenon was reported for acetone sorption into amorphous poly(ether ether) ketone (PEEK), for ethyl acetate sorption into amorphous polystyrene and after sorption of aroma compounds (even at levels <1%) released from orange juice into semi-crystalline polyethylene terephthalate (Berlinet et al, 2005;Chiang et al, 2002;Cornélis et al, 1996). Cornélis et al (1996) explained the increase of PEEK crystallinity by a plasticization effect due to acetone sorption: the mobility of polymer chains was enhanced by disrupting their intermolecular forces, the T g was depressed and the crystallization could occur because at the experimental temperature, the material was between the T g and the melting temperature. In the case of BOPP, ethyl hexanoate sorption had not effect on T g as observed in DSC experiment but at the experimental temperature the polymer was above the T g and below the melting temperature, i.e., in favorable conditions for crystallization.…”

Structural and Thermo-mechanical Evaluation of Two Engineering Thermoplastic Polymers in Contact with Ethanol Fuel from Sugarcane

“…X c integration and calculations were performed according to well-established procedures in the literature 13,[29][30][31] . X c was also calculated from DSC.…”

“…It has high glass transition (T g ≈ 145 °C) and melting (T m = 340 °C) temperatures and has been discussed in the literature since the 1980s 6,[11][12][13][14][15][16] . It can be subjected to a variety of processing routes, has high chemical resistance to many solvents and is employed in a variety of engineering applications (e.g., aerospace, automotive and chemical industries) [17][18][19][20][21][22] .…”