Preparation and Characterization of Solution SIBR via Anionic Polymerization

1997 ◽  
Vol 70 (3) ◽  
pp. 295-308 ◽  
Author(s):  
Adel F. Halasa
Keyword(s):  
Block Copolymers ◽  
Anionic Polymerization ◽  
High Performance ◽  
Sequence Distribution ◽  
Soft Systems ◽  
Simultaneous Control ◽  
Elastomeric Materials ◽  
Hard Block ◽  
The Relationship

Abstract Harnessing anionic terpolymerization of styrene, isoprene and butadiene to a degree where one can achieve simultaneous control of composition, microstructure and sequence distribution results in a unique family of elastomeric materials. We now can tailor-make elastomers having diverse viscoelastic responses to suit specific tire applications, in particular, those required for high performance tires. Furthermore, we have demonstrated unique morphologies attainable for SIBR ranging from lamellar to spherical. Such morphologies were reported previously for soft/hard block copolymers, i.e. SBS and SIS, but not for soft/soft systems. It is our contention that this will further contribute to our understanding of the relationship between morphology and cured physical properties.

ELASTOMERIC NANOPARTICLES: EFFECTIVE ADDITIVE FOR HIGH PERFORMANCE RUBBER NANOCOMPOSITES

2020 ◽  
pp. 000-000 ◽  
Author(s):  
Xiang Wang ◽  
Jinliang Qiao ◽  
Zhifeng Zhou ◽  
Jianming Gao ◽  
Guicun Qi ◽  
...  
Keyword(s):  
Automobile Industry ◽  
High Performance ◽  
Rolling Resistance ◽  
Skid Resistance ◽  
Rubber Composites ◽  
Wear Life ◽  
Important Challenge ◽  
The Relationship ◽  
Wet Skid Resistance

ABSTRACT The “magic triangle” is the most important challenge to rubber composites for the automobile industry. According to the magic triangle, it is difficult to improve the rolling resistance (energy saving), wet skid resistance (safety), and wear (life) of a tire simultaneously. However, ∼5% decrease of rolling resistance, >20% increase of wet skid resistance, and 15% decrease of wear were achieved after adding a small amount of elastomeric nanoparticle (ENP). The effect of ENP on the performances of rubber composites was expounded by characterization of the dispersion of filler and the relationship between filler and rubber. The main difference between ENPs and other nanoparticles was that ENPs acted as not only a part of filler but also as a part of rubber in rubber composites.

Side Chain Liquid Crystalline Block Copolymers With Chiral Smectic C* Mesogens

1996 ◽  
Vol 425 ◽  
Author(s):  
Wen Yue Zheng ◽  
Paula T. Hammond
Keyword(s):  
Glass Transition ◽  
Block Copolymers ◽  
Anionic Polymerization ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Glass Transition Temperatures ◽  
Smectic C

AbstractA new series of side chain liquid crystalline-amorphous diblock copolymers has been successfully synthesized using chiral mesogens. Anionic polymerization techniques have been used to make these monodisperse diblock materials. Preliminary studies suggest that these microphase segregated diblock copolymers exhibit a smectic C* phase. This mesophase exists between and above the glass transition temperatures of the two polymer blocks. Synthesis and characterization of these novel materials are discussed.

scholarly journals Isolation and structural characterization of the polypeptide subunits of membrane glycoprotein IIb-IIIa from human platelets

Blood ◽  
1982 ◽  
Vol 59 (1) ◽  
pp. 80-85 ◽  
Author(s):  
RP McEver ◽  
JU Baenziger ◽  
PW Majerus
Keyword(s):  
High Performance ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Structural Features ◽  
Human Platelets ◽  
Membrane Glycoprotein ◽  
Radiolabeled Peptides ◽  
The Relationship ◽  
Peptide Maps

Abstract We have previously demonstrated the isolation of platelet membrane glycoprotein IIb-IIIa by affinity chromatography with a specific monoclonal antibody. We have now separated the polypeptide subunits IIb and IIIa of the isolated glycoprotein by preparative sodium dodecyl sulfate polyacrylamide gel electrophoresis and have compared their structural features. Both IIb and IIIa contain approximately 15% carbohydrate, but IIIa contains a larger percentage of mannose residues, suggesting the presence of high mannose as well as complex N- linked oligosaccharide chains. The amino acid compositions are sufficiently similar to imply areas of sequence homology between the two subunits. To examine further the relationship between the subunits, we digested a mixture of 125I-IIb and 131I-IIIa with trypsin and then separated the radiolabeled peptides by high performance liquid chromatography. The resultant peptide maps of IIb and IIIa are completely different. This indicates that neither subunit is derived from the other and suggests that polypeptides IIb and IIIa are products of separate genes.

scholarly journals Isolation and structural characterization of the polypeptide subunits of membrane glycoprotein IIb-IIIa from human platelets

Blood ◽  
1982 ◽  
Vol 59 (1) ◽  
pp. 80-85 ◽  
Author(s):  
RP McEver ◽  
JU Baenziger ◽  
PW Majerus
Keyword(s):  
High Performance ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Structural Features ◽  
Human Platelets ◽  
Membrane Glycoprotein ◽  
Radiolabeled Peptides ◽  
The Relationship ◽  
Peptide Maps

We have previously demonstrated the isolation of platelet membrane glycoprotein IIb-IIIa by affinity chromatography with a specific monoclonal antibody. We have now separated the polypeptide subunits IIb and IIIa of the isolated glycoprotein by preparative sodium dodecyl sulfate polyacrylamide gel electrophoresis and have compared their structural features. Both IIb and IIIa contain approximately 15% carbohydrate, but IIIa contains a larger percentage of mannose residues, suggesting the presence of high mannose as well as complex N- linked oligosaccharide chains. The amino acid compositions are sufficiently similar to imply areas of sequence homology between the two subunits. To examine further the relationship between the subunits, we digested a mixture of 125I-IIb and 131I-IIIa with trypsin and then separated the radiolabeled peptides by high performance liquid chromatography. The resultant peptide maps of IIb and IIIa are completely different. This indicates that neither subunit is derived from the other and suggests that polypeptides IIb and IIIa are products of separate genes.

Characterization of slide ring materials for dielectric elastomer actuators

2021 ◽  
Author(s):  
Jun Shintake ◽  
Koya Matsuno ◽  
Kazumasa Baba ◽  
Hiromitsu Takeuchi
Keyword(s):  
Electric Fields ◽  
High Performance ◽  
Mechanical Performance ◽  
Dielectric Strength ◽  
Dielectric Elastomer ◽  
Elongation At Break ◽  
Dielectric Elastomer Actuators ◽  
Elastomeric Materials ◽  
Mechanical Performances

Abstract This paper investigates the characteristics of sliding ring materials (SRMs), which are promising elastomeric materials for dielectric elastomer actuators (DEAs). Two different types of SRMs with Young's modulus of 0.8 MPa and 3.3 MPa, respectively, are prepared, and their material and mechanical properties and electro-mechanical performances at electric fields of up to 30 V/um are characterized. For comparison, the same tests are also performed on several commercially available elastomers: Elastosil 2030, Ecoflex 00-30, CF19-2186, and VHB 4905. The results reveal that SRMs demonstrate negligible Mullins effect and hysteresis, while their dielectric strength (62.4‒112.4 V/µm) and viscoelasticity (tan⁡δ 0.07‒0.24 at 10 Hz) are comparable or even superior to those of other elastomers. In addition, elongation at break is found to be 163.8‒172.1%. SRMs exhibit excellent electro-mechanical performance; for instance, one of the two types has an actuation force 293.2 mN at 24.9 V/µm and a strain of 5.2% at 22.3 V/µm. These values are the largest or larger than most of the tested elastomers. The high performance of SRMs results from their dielectric constant, which ranges from 10.3‒13.4, leading to an electro-mechanical sensitivity of up to 15.3 MPa-1. These results illustrate SRMs as attractive material options for DEAs.

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