Influence of the chain microstructure on the properties of metallocene-based thermoplastic elastic polyolefines [Elektronische Ressource] / Sabine Hild

Informations

• Publié par: universitat_ulm
• Publié le: 01 janvier 2007
• Nombre de lectures: 26
• Langue: English
• Poids de l'ouvrage: 65 Mo

Extrait

Influence of the chain microstructure
on the properties
of metallocene-based
thermoplastic elastic polyolefines
Habilitationsschrift
für das Fach
Makromolekulare Physik
Universität Ulm
Fakultät für Naturwissenschaften
Sabine Hild
Ulm, Mai 2006“Um ein tadelloses Mitglied einer Schafherde sein zu
können, muß man vor allem ein Schaf sein.”
Albert EinsteinTable of contents
Abstract ......................................................................................................................... A-1
1 Overview 1
2 Goals ............................................................................................................................... 5
3 Basics of thermoplastic elastomers ............................................................................. 9
3. 1 Morphology and microstructure 9
3. 2 Chemical structure ............................................................................................... 12
3. 2. 1 Amorphous thermoplastic elastomers ................................................... 13
3. 2. 2 Semicrystallline thermoplastic elastomers ............................................ 14
4 Morphological characterization .................................................................................. 17
4. 1 Scanning force microscopy ................................................................................. 18
4. 1. 1 Tapping Mode imaging .......................................................................... 21
4. 1. 2 Experimental limitations ........................................................................ 25
5 Thermoplastic-elastomeric polyketones .................................................................... 27
5. 1 Polymerization of ethylene-propylene terpolymers .............................................. 28
5. 2 Polymer microstructure ........................................................................................ 29
5. 2. 1 Chain microstructure ............................................................................. 30
5. 2. 2 Crystalline structure .............................................................................. 33
5. 2. 3 Thermal behavior .................................................................................. 37
5. 2. 3. 1 Distribution of amorphous chain segments ........................... 38
5. 2. 3. 2 Distribution of crystallizable chain segments ........................ 40
5. 3 Polymer morphology ............................................................................................ 41
5. 3. 1 Bulk morphology ................................................................................... 42
5. 3. 2 Surface morphology 47
5. 4 Solid state properties ........................................................................................... 50
5. 4. 1 Mechanical properties ........................................................................... 50
5. 4. 2 Surface properties ................................................................................. 54
5. 5 Summary ............................................................................................................. 576 Thermoplastic-elastomeric polypropylenes .............................................................. 59
6. 1 Introduction .......................................................................................................... 59
6. 2 Stereo regular polypropylenes ............................................................................. 62
6. 2. 1 Stereo regularity .................................................................................... 63
6. 2. 2 Stereo regular polypropylenes via metallocene catalysis ..................... 66
6. 2. 3 Isotactic elastomeric polypropenes by homogenous metallocene
catalysis ................................................................................................ 69
6. 2. 4 .............................................................................................................. 72
6. 2. 4. 1 Polymerization mechanism ................................................... 74
6. 2. 4. 2 Chain microstructure ............................................................. 79
6. 3 Crystallization of isotactic polypropylene ............................................................ 80
6. 3. 1 Crystalline microstructure ...................................................................... 80
6. 3. 2 Crystalline forms ................................................................................... 84
6. 4 Properties of low isotactic polypropylenes with randomly distributed
stereoerrors ......................................................................................................... 87
6. 4. 1 Solid state properties of low elastomeric polypropylene containing
statistically distributed stereo errors ...................................................... 88
6. 4. 1. 1 Crystallization properties....................................................... 90
6. 4. 1. 2 Morphology ........................................................................... 92
6. 4. 2 Influence of the sample preparation 95
6. 4. 2. 1 Crystallization and crystalline microstructure ........................ 95
6. 4. 2. 2 Morphology 98
6. 4. 3 Crystallization kinetics ......................................................................... 100
6. 4. 3. 1 Time dependent crystallization and crystalline
microstructure ..................................................................... 101
6. 4. 3. 2 Time dependent changes in morphology ............................ 106
6. 4. 3. 3 Mechanical properties ......................................................... 110
6. 4. 4 Deformation behavior .......................................................................... 111
6. 4. 4. 1 Mechanical induced changes in crystalline phase .............. 113
6. 4. 4. 2 Mechanical induced changes in morphology ...................... 117
6. 4. 5 Summary ............................................................................................. 122
6. 5 Solid state properties of elastic polypropylenes with variable tacticity ............... 124
6. 5. 1 Crystalline microstructure .................................................................... 124
6. 5. 1. 1 Crystallization behavior ....................................................... 124
6. 5. 1. 2 Crystalline phases............................................................... 129
6. 5. 2 Morphology ......................................................................................... 134
6. 5. 2. 1 Dip coated films................................................................... 134
6. 5. 2. 2 Bulk morphology ................................................................. 138