Ionene segmented block copolymers containing imidazolium cations: Structure–property relationships as a function of hard segment content

Polymer ◽  
2010 ◽  
Vol 51 (6) ◽  
pp. 1252-1257 ◽  
Author(s):  
Sharlene R. Williams ◽  
David Salas-de la Cruz ◽  
Karen I. Winey ◽  
Timothy E. Long
Keyword(s):  
Block Copolymers ◽  
Hard Segment ◽  
Structure Property ◽  
Imidazolium Cations ◽  
Structure Property Relationships ◽  
Hard Segment Content

Elastomeric Polyether-Ester Block Copolymers. I. Structure-Property Relationships of Tetramethylene Terephthalate/Polyether Terephthalate Copolymers

1977 ◽  
Vol 50 (4) ◽  
pp. 688-703 ◽  
Author(s):  
J. R. Wolfe
Keyword(s):  
Phase Separation ◽  
Melting Point ◽  
Block Copolymers ◽  
Low Temperature ◽  
Chain Length ◽  
Chemical Structure ◽  
High Water ◽  
Structure Property ◽  
Tear Strength ◽  
Structure Property Relationships

Abstract The properties of elastomeric tetramethylene terephthalate/polyether terephthalate copolymers have been related to the chemical structure, chain length, and concentration in the copolymers of the PTMEG-, PEG-, and PPG-derived polyether units. Low-temperature properties and tear strength are dependent on all three polyether-related variables. Melting point, hardness, and stress at 100% elongation appear to be independent of polyether structure. Polyether glycols of low MW volatilize during copolymer preparation. High-MW polyethers tend to crystallize when present in the copolymers. Polyether glycols of intermediate MW (∼ 1000) yield copolymers with the best resistance to low-temperature stiffening. Copolymer synthesis is most difficult with PPG as the polyether glycol. Inherent viscosities are low, and phase separation occurs at lower polyether MW than with PTMEG or PEG. The PEG-based copolymers exhibit high water swell, particularly at intermediate and high PEG MW. The PTMEG-based copolymers are easiest to synthesize and exhibit the best overall combination of properties.

Structure/property relationships in polystyrene–polyisobutylene–polystyrene block copolymers

2001 ◽  
Vol 367-368 ◽  
pp. 125-134 ◽  
Author(s):  
Dawn M. Crawford ◽  
Eugene Napadensky ◽  
Nora C. Beck Tan ◽  
David A. Reuschle ◽  
David A. Mountz ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Structure Property ◽  
Structure Property Relationships

Structure–property correlations of foul release coatings based on low hard segment content poly(dimethylsiloxane–urethane–urea)

2017 ◽  
Vol 15 (1) ◽  
pp. 185-198 ◽  
Author(s):  
Sangram K. Rath ◽  
Jayesh G. Chavan ◽  
Tanaji K. Ghorpade ◽  
T. Umasankar Patro ◽  
Manoranjan Patri
Keyword(s):  
Hard Segment ◽  
Structure Property ◽  
Hard Segment Content ◽  
Property Correlations

Synthesis and Structure−Property Relationships of Random and Block Copolymers:  A Direct Comparison for Copoly(2-oxazoline)s

2007 ◽  
Vol 40 (16) ◽  
pp. 5879-5886 ◽  
Author(s):  
Martin W. M. Fijten ◽  
Johannes M. Kranenburg ◽  
Hanneke M. L. Thijs ◽  
Renzo M. Paulus ◽  
Bart M. van Lankvelt ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Structure Property ◽  
Structure Property Relationships

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

Approaches for TEM imaging of cavitation in toughened nylon

1989 ◽  
Vol 47 ◽  
pp. 352-353
Author(s):  
Barbara A. Wood
Keyword(s):  
Morphological Characteristics ◽  
Structure Property ◽  
Polymer Systems ◽  
Selective Staining ◽  
Structure Property Relationships ◽  
Rubber Toughened ◽  
Shear Yield ◽  
Controversial Topic ◽  
Selection Of ◽  
Diamond Knife

A controversial topic in the study of structure-property relationships of toughened polymer systems is the internal cavitation of toughener particles resulting from damage on impact or tensile deformation.Detailed observations of the influence of morphological characteristics such as particle size distribution on deformation mechanisms such as shear yield and cavitation could provide valuable guidance for selection of processing conditions, but TEM observation of damaged zones presents some experimental difficulties.Previously published TEM images of impact fractured toughened nylon show holes but contrast between matrix and toughener is lacking; other systems investigated have clearly shown cavitated impact modifier particles. In rubber toughened nylon, the physical characteristics of cavitated material differ from undamaged material to the extent that sectioning of heavily damaged regions by cryoultramicrotomy with a diamond knife results in sections of greater than optimum thickness (Figure 1). The detailed morphology is obscured despite selective staining of the rubber phase using the ruthenium trichloride route to ruthenium tetroxide.

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