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Solid‐state polymerization of poly(ethylene terephthalate): Effect of organoclay concentration
Author(s) -
Dini Maryam,
Carreau Pierre J.,
Kamal Musa R.,
TonThat MinhTan,
Esmaeili Babak
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23853
Subject(s) - materials science , organoclay , crystallinity , nanocomposite , polyethylene terephthalate , extrusion , crystallization , polymerization , polymer chemistry , ethylene , chemical engineering , polymer , composite material , organic chemistry , chemistry , catalysis , engineering
Poly(ethylene terephthalate) (PET)/Cloisite 30B (C30B) nanocomposites of different organoclay concentrations were prepared using a water‐assisted extrusion process. The reduction of the molecular weight ( M w ) of the PET matrix, caused by hydrolysis during water‐assisted extrusion, was compensated by subsequent solid‐state polymerization (SSP). Viscometry, titration, rheological, and dynamic scanning calorimetry measurements were used to analyze the samples from SSP. The weight‐average molecular weight ( M w ) of PET increased significantly through SSP. PET nanocomposites exhibited solid‐like rheological behavior, and the complex viscosity at high frequencies was scaled with the M w of PET. The Maron–Pierce model was used to evaluate the M w of PET in the nanocomposites before and after SSP. It was found that the extent and the rate of the SSP reaction in nanocomposites were lower than those for the neat PETs, due to the barrier effect of clay platelets. Consequently, the SSP rate of PET increased with decreasing particle size for the neat PET and PET nanocomposites. The effect of the M w of PET on the crystallization temperature, crystallinity, and the half‐time, t ½ , of nonisothermal crystallization was also investigated. With increasing M w of PET, t ½ increased, whereas T c and X c decreased. POLYM. ENG. SCI., 54:2925–2937, 2014. © 2014 Society of Plastics Engineers