Phenylethynyl Terminated Arylene Ether Oxadiazole and Triazole Oligomers and Their Cured Polymers

2001 ◽  
Vol 13 (4) ◽  
pp. 313-322 ◽  
Author(s):  
C M Thompson ◽  
P M Hergenrother
Keyword(s):  
Thin Films ◽  
Tensile Properties ◽  
High Performance ◽  
Mechanical Performance ◽  
Tensile Shear ◽  
New Materials ◽  
High Performance Polymers ◽  
Arylene Ether

Several novel phenylethynyl terminated arylene ether oligomers containing oxadiazole and triazole rings were prepared as part of an effort to develop high performance polymers with an attractive combination of properties (e.g. processability and mechanical performance) for future NASA applications. The oligomers displayed low melt viscosities and good solubilities. Thin films cast from solutions of the oligomers and cured for one hour at 350 °Cinairgave good tensile properties. Titanium to titanium (6Al-4V) tensile shear specimens were readily fabricated and provided moderate strengths. The chemistry and properties of these new materials are discussed.

Indole-based high-performance polymeric materials with enhanced mechanical and thermal properties via cation-π interaction

2019 ◽  
Vol 32 (6) ◽  
pp. 662-668
Author(s):  
Xiao-fang Guan ◽  
Cong Liao ◽  
Li Yang ◽  
Guan-jun Chang
Keyword(s):  
Thermal Stability ◽  
Heat Resistance ◽  
Self Assembly ◽  
High Performance ◽  
Mechanical Performance ◽  
Polymeric Materials ◽  
Design Strategy ◽  
Mechanical And Thermal Properties ◽  
Innovative Design ◽  
High Performance Polymers

The preparation of high-performance polymeric materials with both excellent overall mechanical properties and heat resistance remains a considerable challenge. Inspired by the delicate self-assembly processes in nature, a facile strategy is reported for the preparation of high-performance polymeric materials with enhanced mechanical strength and improved thermal stability. In this instance, we successfully constructed a cation- π cross-linked polyimide (Na-poly(aryl indole) imide (Na-PINI)) film with enhanced mechanical performance and heat resistance (∼490°C). This work presents an innovative design strategy for realizing robust polymeric materials with integrated strength and thermal stability; the cation- π interaction is demonstrated to be a new method that may achieve many useful properties for high-performance polymers.

Polymeric Alternatives in Manufacturing Removable Partial Dentures

2017 ◽  
Vol 54 (4) ◽  
pp. 754-756
Author(s):  
Lavinia Cosmina Ardelean ◽  
Cristina Maria Bortun ◽  
Angela Codruta Podariu ◽  
Laura Cristina Rusu
Keyword(s):  
High Performance ◽  
Polymeric Materials ◽  
New Materials ◽  
Alternative Technologies ◽  
High Performance Polymers ◽  
Lower Weight ◽  
Light Curing

Traditionally, removable partial dentures consist of a metallic framework, covered by acrylic saddles, which support acrylic or ceramic teeth. Because their shortcomings, new classes of resins/macromolecular compounds which promise better quality are nowadays available for manufacturing removable partial dentures: urethane-based resins, polyamides, acetal resins, high-performance polymers. Manufacturing these new materials implies alternative technologies like: injection, milling, light-curing. Using these alternative polymeric materials results in dentures with better resistance, elasticity, appearance and lower weight, which provide much more comfort to the patient.

2021 Pioneering Investigator Issue： Mesoporous Polyetherimide Thin Films via Hydrolysis of Polylactide-b-Polyetherimide-b-Polylactide

2021 ◽  
Author(s):  
Dong Guo ◽  
Jocelyn Ariel Riet ◽  
Assad Ullah Khan ◽  
Yichen Guo ◽  
Zhen Xu ◽  
...  
Keyword(s):  
Thin Films ◽  
High Performance ◽  
Covalent Organic Framework ◽  
High Performance Polymers ◽  
Hydrolysis Of ◽  
Organic Framework

Mesoporous polyetherimides are important high-performance polymers. Conventional strategies to prepare porous polyetherimides, and polyimide in general, are based on covalent organic framework or thermolysis of sacrificial polymers. The former produces...

scholarly journals Crosslinked Fluorinated Poly(arylene Ether)s with POSS: Synthesis and Conversion to High-Performance Polymers

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3489
Author(s):  
Yashu He ◽  
Jingting Wang ◽  
Igor S. Sirotin ◽  
Vyacheslav V. Kireev ◽  
Jianxin Mu
Keyword(s):  
Dielectric Constant ◽  
High Performance ◽  
Main Chain ◽  
Dielectric Losses ◽  
Hydrophobic Properties ◽  
Nucleophilic Reaction ◽  
High Performance Polymers ◽  
Low Dielectric ◽  
Arylene Ether ◽  
Chemical Solutions

This study reports on a series of crosslinked poly(arylene ether)s with POSS in the main chain. The fluorinated and terminated poly(arylene ether)s were first synthesized by the nucleophilic reaction of diphenol POSS and decafluorodiphenyl monomers, including decafluorobiphenyl, decaflurobenzophenone, and decafluorodiphenyl sulfone. They were then reacted with 3-hydroxyphenyl acetylene to produce phenylacetylene-terminated poly(arylene ether)s. The polymers were of excellent processability. When heated to a high temperature, the polymers converted into a crosslinked network, exhibiting a low range of dielectric constant from 2.17 to 2.58 at 1 HMz, strong resistance against chemical solutions, low dielectric losses, and good thermal and hydrophobic properties.

Current Options of Making Implant Supported Prosthetic Restorations to Mitigate the Impact of Occlusal Forces

2017 ◽  
Vol 376 ◽  
pp. 66-77
Author(s):  
Horia Octavian Manolea ◽  
Florian Obădan ◽  
Sanda Mihaela Popescu ◽  
Radu Rîcă ◽  
Petre Mărășescu ◽  
...  
Keyword(s):  
High Performance ◽  
High Stress ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
New Materials ◽  
High Stress Concentration ◽  
High Performance Polymers ◽  
Bone Level ◽  
The Impact ◽  
Single Implant

The lack of a periodontium for a dental implant may lead to high stress concentration at the bone level when the implants are prosthetically loaded. The present paper discusses the current possibilities of implant supported prosthesis making in order to mitigate the impact of occlusal forces. The cement layer may serve as an absorber for the strain, but its role is reduced and poses the risk of excess cement retained in the peri-implant tissue. The use of resin materials for the implant supported prosthetic restorations veneering it has been suggested for many years, but their role it is important in the case of full-arch fixed implant-supported prosthesis with cantilever distal extensions and less in single implant restorations. Nowadays, new materials like fiber-reinforced composites and high-performance polymers as PEEK may be used for the framework of the implant supported prosthetic restorations, but also for the implant or the prosthetic abutment realization.

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

Mineral/microfibrillated cellulose composite materials: High performance products, applications, and product forms

TAPPI Journal ◽  
2018 ◽  
Vol 17 (09) ◽  
pp. 507-515 ◽  
Author(s):  
David Skuse ◽  
Mark Windebank ◽  
Tafadzwa Motsi ◽  
Guillaume Tellier
Keyword(s):  
Composite Materials ◽  
High Performance ◽  
Aqueous Suspension ◽  
Production Capacity ◽  
Cost Savings ◽  
Cost Effective ◽  
New Materials ◽  
Wet Strength ◽  
Product Forms ◽  
Cellulose Composite

When pulp and minerals are co-processed in aqueous suspension, the mineral acts as a grinding aid, facilitating the cost-effective production of fibrils. Furthermore, this processing allows the utilization of robust industrial milling equipment. There are 40000 dry metric tons of mineral/microfbrillated (MFC) cellulose composite production capacity in operation across three continents. These mineral/MFC products have been cleared by the FDA for use as a dry and wet strength agent in coated and uncoated food contact paper and paperboard applications. We have previously reported that use of these mineral/MFC composite materials in fiber-based applications allows generally improved wet and dry mechanical properties with concomitant opportunities for cost savings, property improvements, or grade developments and that the materials can be prepared using a range of fibers and minerals. Here, we: (1) report the development of new products that offer improved performance, (2) compare the performance of these new materials with that of a range of other nanocellulosic material types, (3) illustrate the performance of these new materials in reinforcement (paper and board) and viscosification applications, and (4) discuss product form requirements for different applications.

CHEMICAL CONVERSION OF 2.4.6-TRINITROTOLUENE (TNT) TO NEW HIGH PERFORMANCE POLYMERS

2002 ◽  
Vol 5 (1-6) ◽  
pp. 1031-1047
Author(s):  
A. L. Rusanov ◽  
L. G. Komarova ◽  
M. P. Prigozhina ◽  
V. A. Tartakovsky ◽  
S. A. Shevelev ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Conversion ◽  
High Performance Polymers

BERYLCO 25

Alloy Digest ◽  
1973 ◽  
Vol 22 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
Beryllium Copper

Abstract BERYLCO 25 is the standard high-performance beryllium copper alloy most widely used because of its high strength, hardness and excellent spring characteristics. BERYLCO 25 is the updated version of BERYLCO 25S (Alloy Digest Cu-3, November 1952). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-271. Producer or source: Kawecki Berylco Industries Inc..

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