Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Ritva Paukkeri"'
Publikováno v:
Polymer. 35:2636-2643
The molecular structure of three isotactic polypropylenes polymerized using either slurry or bulk process and heterogeneous Ziegler-Natta catalysts without external donors was studied in this work. The influence of external donor addition was also ex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4da65448bba4ba72209887db3cbe7ded
https://doi.org/10.1016/0032-3861(94)90392-1
https://doi.org/10.1016/0032-3861(94)90392-1
Autor:
Arja Lehtinen, Ritva Paukkeri
Publikováno v:
Macromolecular Chemistry and Physics. 195:1539-1556
Different extraction techniques were applied to the fractionation of isotactic polypropylene. In solvent gradient extraction experiments two different solvent/non-solvent systems were studied. Investigation of the fractions obtained by GPC, DSC and F
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e15708184fdfc66930a6ca01fe03717
https://doi.org/10.1002/macp.1994.021950507
https://doi.org/10.1002/macp.1994.021950507
Autor:
Arja Lehtinen, Ritva Paukkeri
Publikováno v:
Polymer. 35:1673-1679
Five isotactic polypropylenes produced with different processes and different heterogeneous Ziegler-Natta catalyst systems were fractionated using n-heptane extraction in a Soxhlet apparatus. The unfractionated polymers and their heptane-soluble and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28aa531c12d84c6ed8d2843994152e76
https://doi.org/10.1016/0032-3861(94)90841-9
https://doi.org/10.1016/0032-3861(94)90841-9
Autor:
Ritva Paukkeri, Arja Lehtinen
Publikováno v:
Polymer. 34:4075-4082
Five isotactic polypropylenes, produced by different polymerization processes and with different heterogeneous catalyst systems, were fractionated according to stereoregularity. One of the samples was also fractionated according to molecular weight,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63d3789200aac475ffc3cb4f114bad36
https://doi.org/10.1016/0032-3861(93)90669-2
https://doi.org/10.1016/0032-3861(93)90669-2
Autor:
Arja Lehtinen, Ritva Paukkeri
Publikováno v:
Polymer. 34:4083-4088
The appearance of double melting endotherms in dynamic d.s.c. runs of polypropylene fractions was studied with the aim of relating their appearance to the structure of the polymer. Fractions obtained by fractionation either according to stereoregular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2965fd9b6a89e2e44600c5acb6bb8fe5
https://doi.org/10.1016/0032-3861(93)90670-6
https://doi.org/10.1016/0032-3861(93)90670-6
Publikováno v:
Polymer. 34:2488-2494
Microstructural analysis was carried out on five isotactic polypropylenes produced with different heterogeneous Ziegler-Natta catalyst systems and different polymerization processes. The samples were fractionated according to stereostructure using a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5235d4e0cf3135f11ababfdbb26eaa2e
https://doi.org/10.1016/0032-3861(93)90577-w
https://doi.org/10.1016/0032-3861(93)90577-w
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Autor:
Poulose, Anesh Manjaly, Elnour, Ahmed Yagoub, Kumar, Nadavala Siva, Alhamidi, Abdullah, George, Justin, Al‐Ghurabi, Ebrahim H., Boumaza, Mourad, Al‐Zahrani, Saeed
Publikováno v:
Journal of Applied Polymer Science; 5/5/2021, Vol. 138 Issue 17, p1-9, 9p
Autor:
Weijiao Jiang, Song, Yuchen, Song, Xiuduo, Zhang, Yue, Hu, Bo, Liang, Zhiming, Chen, Xuebing, Chen, Zhengfang, Kang, Jian, Cao, Ya, Xiang, Ming
Publikováno v:
Polymer Science -- Series A; 2020, Vol. 62 Issue 6, p616-629, 14p
Autor:
Lehtinen, Arja, Paukkeri, Ritva
Publikováno v:
Macromolecular Chemistry & Physics; May1994, Vol. 195 Issue 5, p1539-1556, 18p