Novel Piezoelectric Polyimides

1995 ◽  
Vol 413 ◽  
Author(s):  
Joycelyn O. Simpson ◽  
Sharon S. Welch ◽  
Terry L. St.Clair
Keyword(s):  
High Performance ◽  
Elevated Temperatures ◽  
Piezoelectric Properties ◽  
Molecular Design ◽  
State Of The Art ◽  
Piezoelectric Sensor ◽  
Sensor Response ◽  
Piezoelectric Polymers ◽  
The Relationship

ABSTRACTThis research focuses on the synthesis, processing, and characterization of novel high performance piezoelectric polymers. A series of polyimides containing pendant, polar trifluoro (-CF 3) and nitrile (-CN) groups have been synthesized, electroded and poled. Measurements of the piezoelectric sensor response are presented to demonstrate the relationship between dipole concentration and the level of piezoelectricity for these materials. An understanding of the effect of dipole concentration on piezoelectric properties will enable the molecular design of polymers possessing distinct improvements over state of the art piezoelectric polymers including enhanced polarizability, polarization stability at elevated temperatures, and increased mechanical integrity.

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.

High-performance, high-temperature piezoelectric BiB3O6 crystals

2015 ◽  
Vol 3 (2) ◽  
pp. 329-338 ◽  
Author(s):  
Fapeng Yu ◽  
Qingming Lu ◽  
Shujun Zhang ◽  
Hewei Wang ◽  
Xiufeng Cheng ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Temperature Stability ◽  
Piezoelectric Sensor ◽  
High Temperature Stability ◽  
Sensor Applications

BiB3O6 crystals possess large piezoelectric coefficients and high-temperature stability of their piezoelectric properties, which is promising for piezoelectric sensor applications.

Preparation and Characterization of (1-x)BiScO3-xPbTiO3 Ceramics by Two-Step Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 8-10 ◽  
Author(s):  
Ting Ting Zou ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Grain Size ◽  
Low Temperature ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Sintering Aid ◽  
Potential Approach ◽  
Fine Grain ◽  
Sintering Method

High-performance fine-grain (1-x)BiScO3-xPbTiO3 ceramics were prepared by two-step sintering method. Influences of sintering temperature, holding time, and composition on the microstructure and properties were discussed. The BSPT ceramics obtained via two-step sintering reaches density higher than 95% at a low temperature of 800°C without any sintering aid, and the grain size of the ceramics is also effectively controlled. Excellent piezoelectric properties between the composition of x=0.63 and x=0.64 reveals a probable MPB in this range, suggesting a potential approach to pursue high performance BSPT ceramics.

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.

Prokaryotic Expression and Functional Characterization of the 19 kDa Protein in Balanus albicostatus Cement

2013 ◽  
Vol 461 ◽  
pp. 445-450
Author(s):  
Chao Liang ◽  
Yun Qiu Li ◽  
Bi Ru Hu ◽  
Wen Jian Wu
Keyword(s):  
Amino Acid ◽  
Molecular Design ◽  
Functional Characterization ◽  
Blue Staining ◽  
Amino Acid Residues ◽  
Adhesive Ability ◽  
Solid Liquid ◽  
Dental Applications ◽  
The Relationship

Barnacle is a unique sessile crustacean, which produces a multi-protein complex historically called barnacle cement to attach to diverse immersed materials permanently. The proteinaceous cement exhibits powerful adhesive property and special waterproof capability to cure at solid-liquid boundaries, which makes it ideal biomaterial for technical, medical and dental applications. It has been proved that a 19 kDa protein component, termed cp-19k in the cement plays a key role in surface coupling during underwater attachment. To verify whether the bacterial recombinant 19 kDa protein retains the adhesive ability, we cloned and sequenced the Bacp-19k gene in Balanus albicostatus. It encodes 173 amino acid residues, with seven biased ones, Thr, Lys, Gly, Ala, Val, Ser and Leu, comprising about 80% of the total. Two amino acid substitutions (F69L, I106L) were discovered in Bacp-19k due to the polymorphisms in barnacle cp-19ks, compared with the submitted one (GenBank: AB242295.1). Recombinant Bacp-19k was highly expressed in host strain Escherichia coli BL21 (DE3) and purified by affinity chromatography. Adsorption of recombinant Bacp-19k to glass substrata was examined by Coomassie brilliant blue staining. Future study will reveal the relationship between specific structures and functions for molecular design of novel biomimetic underwater adhesives.

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.

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.

THE EFFECT OF MOLECULAR WEIGHT ON THE RELATIVE BIOAVAILABILITY OF HEPARIN

1987 ◽  
Author(s):  
R M Emanuele ◽  
J Fareed
Keyword(s):  
Molecular Weight ◽  
Unfractionated Heparin ◽  
High Performance ◽  
Gel Filtration ◽  
Subcutaneous Administration ◽  
Relative Bioavailability ◽  
Distribution Area ◽  
Time Curve ◽  
The Relationship

Three fractions of different molecular weight (M. W.) were obtained from gel-filtration of porcine mucosal heparin. These fractions along with unfractionated and a low M. W. heparin (CY 216) were compared for relative bioavailability in primates (Macaca mulatta: n = 5). The M. W.'s of all fractions were determined using high performance liquid chromatography - gel permeation and characterizied in terms of mean M. W., peak M. W. and M. W. distribution. Area under the plasma concentration time curve (AUC) was calculated by the trapezoidal method after intravenous and subcutaneous administration and used as an index of bioavailability. For the AUC calculations, plasma heparin concentrations were determined using a Xa/IIa clotting assay (Heptest) and individual callibration curves. Using the AUC data, relative bioavailability was calculated using the following formula:Bioavailability = subcutaneous AUC / dose intravenous AUC / dose Significant differences in the bioavailability of the various molecular weight fractions were observed and inversely related to M. W. The highest M. W. fraction (23,000) showed the least bioavailability at 3 %. The bioavailability of the 13,300 M. W. fraction was 9 % while the 5,100 M. W. fraction was 93 % bioavailable. CY 216 (M. W. 5,400) displayed a relative bioavailability of 88 % while unfractionated heparin (M. W. 12,600) was 40 %. The apparent discrepancy in the bioavailability of the unfractionated heparin is likely due to differences in molecular weight distribution.These studies suggest that the M. W. of heparin preparations influences the relative bioavailability. Heparins of lower M. W. exhibit greater relative bioavailability compared to high M. W. preparations. Furthermore, characterization of both mean M. W. and M. W. distribution are necessary for predicting the bioavailability characteristics of heparin. The relationship between relative bioavailability and the M. W. of heparin may help identify low M. W. heparins as a more efficient agent for subcutaneous regimens in the prophylaxis of venous thrombosis.

scholarly journals Data-Dependent Acquisition and Database-Driven Efficient Peak Annotation for the Comprehensive Profiling and Characterization of the Multicomponents from Compound Xueshuantong Capsule by UHPLC/IM-QTOF-MS

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3431 ◽  
Author(s):  
Tiantian Zuo ◽  
Yuexin Qian ◽  
Chunxia Zhang ◽  
Yuxi Wei ◽  
Xiaoyan Wang ◽  
...  
Keyword(s):  
Ion Mobility ◽  
High Performance ◽  
State Of The Art ◽  
Reversed Phase ◽  
Bioactive Components ◽  
Chemical Complexity ◽  
Chinese Patent ◽  
Peak Annotation ◽  
Ophthalmic Disease

The state of the art ion mobility quadrupole time of flight (IM-QTOF) mass spectrometer coupled with ultra-high performance liquid chromatography (UHPLC) can offer four-dimensional information supporting the comprehensive multicomponent characterization of traditional Chinese medicine (TCM). Compound Xueshuantong Capsule (CXC) is a four-component Chinese patent medicine prescribed to treat ophthalmic disease and angina. However, research systematically elucidating its chemical composition is not available. An approach was established by integrating reversed-phase UHPLC separation, IM-QTOF-MS operating in both the negative and positive electrospray ionization modes, and a “Component Knockout” strategy. An in-house ginsenoside library and the incorporated TCM library of UNIFITM drove automated peak annotation. With the aid of 85 reference compounds, we could separate and characterize 230 components from CXC, including 155 ginsenosides, six astragalosides, 16 phenolic acids, 16 tanshinones, 13 flavonoids, six iridoids, ten phenylpropanoid, and eight others. Major components of CXC were from the monarch drug, Notoginseng Radix et Rhizoma. This study first clarifies the chemical complexity of CXC and the results obtained can assist to unveil the bioactive components and improve its quality control.

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