Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Arja Lehtinen"'
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 46:1577-1588
Effect of molar mass distribution (MMD) and composition distribution (CD) on crystallization behavior of linear low-density polyethylene materials at moderate and high supercooling was studied using differential scanning calorimetry, hot-stage polari
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f41714c0e27de47b7dae0b511b21c777
https://doi.org/10.1002/polb.21494
https://doi.org/10.1002/polb.21494
Publikováno v:
European Polymer Journal. 40:371-378
Crystallisation of high density polyethylene (HDPE) blends with broad bimodal molar mass distribution was investigated by differential scanning calorimetry (DSC) under non-isothermal conditions. The blends were prepared by blending a high molar mass
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::805914ac28e9740acf2084ccd306757d
https://doi.org/10.1016/j.eurpolymj.2003.10.004
https://doi.org/10.1016/j.eurpolymj.2003.10.004
Publikováno v:
European Polymer Journal. 40:359-369
Isothermal crystallisation of high density polyethylene (HDPE) blends and their parent polymers was investigated. The blends having broad bimodal molar mass distributions and various compositions were prepared by blending a high molar mass (Mw=330 kg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c23abd2faadd5e0d592feb8731eb2d7
https://doi.org/10.1016/j.eurpolymj.2003.10.005
https://doi.org/10.1016/j.eurpolymj.2003.10.005
Publikováno v:
Macromolecules. 32:6687-6696
Linear and long chain branched ethene homopolymers and copolymers with 1-hexene were produced with metallocene catalysts. The presence and absence of long chain branching in the polymers was studie...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e160e51bbe8566f13d694fc3d38d5099
https://doi.org/10.1021/ma9907136
https://doi.org/10.1021/ma9907136
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