Poly , elastomeric

Collins S, Gauthier WJ, Corrigan JF, Nicholas NJ (1995) Elastomeric poly(propylene) influence of catalyst structure and polymerization conditions on polymer structure and properties. Macromolecules 28 3771-3778... 

Collins S, Bailey L, Pigeon M (1998) Synthesis of elastomeric poly(propylene) using unsym-metrical zirconocene catalysts marked reactivity differences of rac - and meso -like dias-tereomers. Macromolecules 31 1000-1009... 

Hild S, Rieger B, Troll C, Cobzaru C (2006) Elastomeric poly(propylene) from dual-side metallocenes reversible chain transfer and its influence on polymer microstructure. Macromol Chem Phys 207 665-683... 

Diblock copolymers, especially those containing a block chemically identical to one of the blend components, are more effective than triblocks or graft copolymers. Thermodynamic calculations indicate that efficient compat-ibilisation can be achieved with multiblock copolymers [47], potentially for heterogeneous mixed blends. Miscibility of particular segments of the copolymer in one of the phases of the bend is required. Compatibilisers for blends consisting of mixtures of polyolefins are of major interest for recyclates. Random poly(ethylene-co-propylene) is an effective compatibiliser for LDPE-PP, HDPE-PP or LLDPE-PP blends. The impact performance of PE-PP was improved by the addition of very low density PE or elastomeric poly(styrene-block-(ethylene-co-butylene-l)-block styrene) triblock copolymers (SEBS) [52]. 

Elastomeric poly acetaldehyde is amorphous and atactic. High resolution NMR studies were carried out in order to determine the actual tacticity of the polymer (4, 5, 23). Poly acetaldehyde consists mainly of heterotactic sequences isotactic sequences are also present in the polymer. The ratio of heterotactic to isotactic varies, but it is usually between 2-3 1. A detailed description of the tacticity determination by high resolution NMR will be given in a subsequent paper by Goodman and Brandrup (23). 

The extreme thermal stability of icosahedral carboranes has long attracted the interest of polymer chemists seeking to develop new materials for high-temperature applications.1 Nevertheless, only the elastomeric poly(carborane-siloxane)s, for example 1, have ever been manufactured on an industrial scale.2 This situation reflects not only the very high cost of carborane-based starting materials, but also a failure to develop linkages between carborane cages which can match the stability of the carborane unit itself. 

Poly vinyl chloride) in plasticizers Thermoplastic elastomeric poly(propylene)... 

Lin, Y. G., Mallin, D. T., Chien, J. C. W., and Winter, H. H. 1991. Dynamic mechanical measurement of crystallization-induced gelation in thermoplastic elastomeric poly(propylene). Macromolecules 24 850-854. 

Elastomeric Poly(dimethylsiloxane) Networks with Numerous Short-Chain Segments... 

FIGURE 8.9 Synthesis of elastomeric poly(ester amide)s derived from l,3-diamino-2-hydroxy-propane based on Ref. [44]. and R represent either a single hydrogen or bond to either the Z-segment or the F-segment via amide bond or ester bond, respectively. 

Amino-acid based biodegradable elastomeric poly(ester amide) fibers... 

Wang, S. Mark, J. E., Reinforcement of Elastomeric Poly(dimethylsiloxane) by Glassy Poly(diphenylsiloxane). J. Mater. Sci. 1990,25, 65-68. 

Biodegradable elastomeric poly(urethane) scaffolds have been fabricated by the inkjet technique (71). As monomers, methylene di-p-phenyl-diisocyanate, polycaprolactone diol, and N,N-bis(2-hy-droxyethyl)-2-aminoethane-sulfonic acid were used. The monomers are shown in Figure 7.4. 

Riffle, J. S. YUgor, I. Banthia, A. K. Wilkes, G. L. Mcgrath, J. E. Elastomeric poly-sUoxane modifiers for epoxy networks. Epoxy Resins Chemistry, ACS Symp., 1983, 221,2. ... 

Guan et al. (2007) have also shown that PURs are suitable matrices for the release of biomolecules. They designed an elastomeric poly(ester urethane)-urea scaffold for the controlled release of fibroblast growth factor (bFG). The PUR matrix was able to maintain bFGF activity for 21 days and to sustain its release over a period of 4 weeks. 

Gauthier, W. J. Collins, S. Elastomeric poly(propylene) Propagation models and relationship to catalyst structure. Macromolecules 1995, 28, 3779-3786. 

Chien, J. C. W. Rieger, B. Sugimoto, R. Malhn, D. T. Rausch, M. D. Homogeneous Ziegler-Natta catalysts and synthesis of anisotactic and thermoplastic elastomeric poly(propenes). Stud. Surf. Sci. Catal. 1990, 56, 535-574. 

Bravakis, A. M. Bailey, L. E. Pigeon, M. Collins, S. Synthesis of elastomeric poly(propylene) using unsymmetrical zirconocene catalysts Marked reactivity differences of roc - and meio -like diastereomers. MocmmofecMfes 1998, 31, 1000-1009. 

Hong Y, Ye SH, Pelinescu AL, Wagner WR. Synthesis, characterization, and paclitaxel release from a biodegradable, elastomeric, poly(ester urethane)urea bearing phosphoryl-choline groups for reduced thrombogenicity. Biomacromolecules 2012 13(ll) 3686-94. 

Similarly, Guan et al. (2007) developed an elastomeric poly (ester urethane)-urea scaffold by a thermally induced phase separation method for the release of bFGF. The scaffold maintained bFGF bioactivity over a period of 21 days and showed a two-phase protein release pattern, characterized by a fast initial release of about 30% in the first 2 days, followed by a slow release over a period of 4 weeks. 

Bioresorbable poly(ester urethanes) have been developed by reacting lysine diisocyanate (LDI) with polyester diols or triols based on D,L-lactide, caprolac-tone, and other copolymers [45]. In these systems, aliphatic polyesters such as PLGA or PCL form the soft segments and the polypeptides form the hard segments [46]. A resorbable elastomeric poly(ester urethane) called Degrapol is available commercially. It is currently being used to develop porous scaffolds for tissue engineering applications. 

In addition to pore size, the mechanical strength of polymer substrates has an influence on the behaviour of cells, as cells sense their environment through the focal adhesions that attach the cytoskeleton to the scaffold.The mechanical properties of elastomeric poly(l,2-butadiene) (PB) honeycomb patterned films can be controlled by crosslinking the films under UV radiation.Crosslinking of the PB films resulted in a 15-fold increase in the elastic modulus but had no effect on the surface properties of the polymer. Murine fibroblasts exhibited stronger adhesions to the crosslinked PB films. When attached to a growth substrate, cells apply a traction force of 30 nN to the surface. Simulation of this force on the... 

Patterning SAMs in the plane of the monolayer is useful in determining the two-dimensional distribution of chemical and physical properties on a surface. There are several methods available for generation of patterned SAMs. (jlCP is a convenient technique that stamps a pattern of SAM directly on a surface (Figure 8) [82,83]. In p,CP, an elastomeric poly(dimethylsiloxane) (PDMS) stamp — fabricated by casting and curing PDMS against masters that present patterned... 

---