The high temperature secondary crystallisation of aged isotactic polypropylene
Apstrakt
The secondary crystallization of aged isotactic polypropylene (iPP) of different morphologies, which occurs during annealing in the vicinity of the melting temperature (140 degreesC), was studied using differential scanning calorimetry (DSC) and density measurements. The results of calorimetric and density measurements were correlated. Kinetics of the high temperature secondary crystallization (HTSC) was studied by using Avrami relations. Avrami exponents, obtained according to the increase in crystallinity after annealing at 140 degreesC, were considered as the measure of the ability of iPP to crystallize secondarily. Depending on the initial morphology of the samples, accelerated ageing influences in different ways the ability of iPP to subsequently crystallize upon annealing. The aged samples with larger amorphous content show a reduced secondary crystallization at high temperature compared with the unaged samples. On the other hand, aging of medium crystalline samples leads to more... pronounced HTSC. (C) 2004 Elsevier Ltd. All rights reserved.
Ključne reči:
isotactic polypropylene / secondary crystallization / DSC / ageing / avrami exponentsIzvor:
Polymer Testing, 2004, 23, 6, 621-627
DOI: 10.1016/j.polymertesting.2004.01.015
ISSN: 0142-9418
WoS: 000223093900003
Scopus: 2-s2.0-3042815219
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Dudić, Duško AU - Đoković, Vladimir AU - Kostoski, Dušan PY - 2004 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2796 AB - The secondary crystallization of aged isotactic polypropylene (iPP) of different morphologies, which occurs during annealing in the vicinity of the melting temperature (140 degreesC), was studied using differential scanning calorimetry (DSC) and density measurements. The results of calorimetric and density measurements were correlated. Kinetics of the high temperature secondary crystallization (HTSC) was studied by using Avrami relations. Avrami exponents, obtained according to the increase in crystallinity after annealing at 140 degreesC, were considered as the measure of the ability of iPP to crystallize secondarily. Depending on the initial morphology of the samples, accelerated ageing influences in different ways the ability of iPP to subsequently crystallize upon annealing. The aged samples with larger amorphous content show a reduced secondary crystallization at high temperature compared with the unaged samples. On the other hand, aging of medium crystalline samples leads to more pronounced HTSC. (C) 2004 Elsevier Ltd. All rights reserved. T2 - Polymer Testing T1 - The high temperature secondary crystallisation of aged isotactic polypropylene VL - 23 IS - 6 SP - 621 EP - 627 DO - 10.1016/j.polymertesting.2004.01.015 ER -
@article{ author = "Dudić, Duško and Đoković, Vladimir and Kostoski, Dušan", year = "2004", abstract = "The secondary crystallization of aged isotactic polypropylene (iPP) of different morphologies, which occurs during annealing in the vicinity of the melting temperature (140 degreesC), was studied using differential scanning calorimetry (DSC) and density measurements. The results of calorimetric and density measurements were correlated. Kinetics of the high temperature secondary crystallization (HTSC) was studied by using Avrami relations. Avrami exponents, obtained according to the increase in crystallinity after annealing at 140 degreesC, were considered as the measure of the ability of iPP to crystallize secondarily. Depending on the initial morphology of the samples, accelerated ageing influences in different ways the ability of iPP to subsequently crystallize upon annealing. The aged samples with larger amorphous content show a reduced secondary crystallization at high temperature compared with the unaged samples. On the other hand, aging of medium crystalline samples leads to more pronounced HTSC. (C) 2004 Elsevier Ltd. All rights reserved.", journal = "Polymer Testing", title = "The high temperature secondary crystallisation of aged isotactic polypropylene", volume = "23", number = "6", pages = "621-627", doi = "10.1016/j.polymertesting.2004.01.015" }
Dudić, D., Đoković, V.,& Kostoski, D.. (2004). The high temperature secondary crystallisation of aged isotactic polypropylene. in Polymer Testing, 23(6), 621-627. https://doi.org/10.1016/j.polymertesting.2004.01.015
Dudić D, Đoković V, Kostoski D. The high temperature secondary crystallisation of aged isotactic polypropylene. in Polymer Testing. 2004;23(6):621-627. doi:10.1016/j.polymertesting.2004.01.015 .
Dudić, Duško, Đoković, Vladimir, Kostoski, Dušan, "The high temperature secondary crystallisation of aged isotactic polypropylene" in Polymer Testing, 23, no. 6 (2004):621-627, https://doi.org/10.1016/j.polymertesting.2004.01.015 . .