Correlations of single-point parameters of linear rheology and molecular weight distribution of polypropylene homo- and copolymers

被引:5
|
作者
Gschwendner, Georg [1 ]
Gitsas, Antonis [2 ]
Gahleitner, Markus [2 ]
Moser, Patrick [2 ]
Paulik, Christian [1 ]
机构
[1] Johannes Kepler Univ Linz, Inst Chem Technol Organ Mat, Linz, Austria
[2] Borealis Polyolefine GmbH, Innovat & Technol, Linz, Austria
关键词
molecular weight; parameter correlations; polydispersity; polypropylene; rheology; MELT FLOW INDEX; POLYMER RHEOLOGY; MECHANICAL-PROPERTIES; BEHAVIOR; MWD; POLYDISPERSITY; DEGRADATION; PREDICTION; EXTRUSION; DENSITY;
D O I
10.1002/app.55232
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
For various purposes, it is required to compress the shape of the molecular weight distribution (MWD) of polymers into a limited set of parameters. With increasing molecular weight and polydispersity, the MWD data obtained from chromatography become increasingly unreliable due to deficiencies in the high molecular weight region, making estimation via melt rheology more preferable. A number of empirical parameters obtained from melt rheology can be related back to MWD parameters. The target of this study is to establish the reliability of such relations for polypropylene homo- and copolymers. It is found that correlations between polydispersity from rheological crossover modulus and polydispersity via chromatography are not always valid. Therefore, the range of applicability must be kept in mind when attempting predictions based on these correlations because rheological measurements are sensitive to molecular characteristics in ways different from chromatography. The use of a modified polydispersity index is shown to be more reliable. This works puts to the test the correlation of parameters derived from melt rheology and chromatography, for the case of polypropylenes with different molecular architectures. While the modified polydispersity index provides solid predictions, for broader molecular weight range the applicability of other empirical parameters is less favorable than predicted by theory.image
引用
收藏
页数:7
相关论文
共 23 条
  • [1] Effect of the Molecular Structure of the Polymer and Nucleation on the Optical Properties of Polypropylene Homo- and Copolymers
    Horvath, Zsuzsanna
    Menyhard, Alfred
    Doshev, Petar
    Gahleitner, Markus
    Voeroes, Gyoergy
    Varga, Jozsef
    Pukanszky, Bela
    ACS APPLIED MATERIALS & INTERFACES, 2014, 6 (10) : 7456 - 7463
  • [2] Evaluating the molecular weight distribution of ultrahigh molecular weight polypropylene through rheology
    Ianniello, Vincenzo
    Costanzo, Salvatore
    Pasquino, Rossana
    Ianniruberto, Giovanni
    Gupta, Virendra K.
    Stieglitz, Lucas
    Rieger, Bernhard
    Tervoort, Theo
    Grizzuti, Nino
    PHYSICS OF FLUIDS, 2023, 35 (06)
  • [3] THE INFLUENCE OF MOLECULAR-WEIGHT DISTRIBUTION ON MELT RHEOLOGY OF POLYPROPYLENE
    ZEICHNER, GR
    PATEL, PD
    JOURNAL OF RHEOLOGY, 1982, 26 (01) : 93 - 93
  • [4] RHEOLOGY OF POLYPROPYLENE - INFLUENCE OF MOLECULAR WEIGHT DISTRIBUTION ON MELT ELASTICITY
    PETRAGLIA, G
    COEN, A
    POLYMER ENGINEERING AND SCIENCE, 1970, 10 (02): : 79 - +
  • [5] DETERMINING MOLECULAR WEIGHT OF POLYMETHYLENE METHACRYLATE BY SINGLE-POINT METHOD
    GERNER, MM
    NOVIK, EY
    RYABINA, LV
    BOGUSLAV.IY
    BATOVSKI.VN
    INDUSTRIAL LABORATORY, 1965, 31 (05): : 728 - &
  • [6] Weight losses and molecular weight changes correlated with the evolution of hydroxyacids in simulated in vivo degradation of homo- and copolymers of PLA and PGA
    Hakkarainen, M
    Albertsson, AC
    Karlsson, S
    POLYMER DEGRADATION AND STABILITY, 1996, 52 (03) : 283 - 291
  • [7] Synthesis of ultra-high molecular weight homo- and copolymers via an ultrasonic emulsion process with a fast rate
    Kalita, Uddhab
    Jafari, Vianna F.
    Ashokkumar, Muthupandian
    Singha, Nikhil K.
    Qiao, Greg G.
    COMMUNICATIONS CHEMISTRY, 2024, 7 (01):
  • [8] Material parameters estimation for the rheology to molecular weight distribution conversion of polyethylenes
    Wei, Xiaoling
    Collier, John R.
    Petrovan, Simioan
    Patil, Parag
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2005, 230 : U4096 - U4097
  • [9] Determination of Molecular Weight and Distribution of Tetrafluoroethylene-Hexafluoropropylene Copolymers by a Dynamic Rheology Method
    Shen, Lie
    Li, Xin-Jun
    Li, Jia-Cai
    Yu, Kao-Ming
    JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS, 2012, 51 (1-3): : 383 - 392