Blends of PET and amorphous thermoplastics (e.g., Polycarbonate , PC) are reported to have a lower degree of cristallinity for PET.
"PET crystallinity and consequently its physical and mechanical properties are highly dependent on processing conditions like processing temperature, cooling rate, stretching process etc." (Bilal DEMİREL, Ali YARAȘ, Hüseyin ELÇİÇEK, Crystallization Behavior of PET Materials, BAÜ Fen Bil. Enst. Dergisi Cilt 13(1) 26-35 (2011), http://fbe.balikesir.edu.tr/dergi/20111/BAUFBE2011-1-3.pdf).
I want to prepare amorphous sheets with 1cm thickness via quenching in a water–ice bath. So I need additives to reduce crystallization rate of PET from the melt state. Is polystyrene a good choice for this purpose?
I just found a paper (http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000600033 , Effect of polystyrene on poly(ethylene terephthalate) crystallization) on the blends of PS (up to 60%) in PET.
These are the conclusions:
"Addition of amorphous PS to semi crystalline PET affects the nonisothermal cold crystallization process of the later, but not the total amount crystallized. "
Please allow me to express my gratitude to you for taking the time to help me.
According to the paper (http://www.tandfonline.com/doi/abs/10.1081/PPT-120002068), rate of crystallization of PET, crystallized from melt, decreases marginally by adding PS but degree of crystallinity of PET has shown a steady increase with the composition in PET–PS blends.