Poly(Enaminonitriles): Novel Materials For Use In Microelectronics

1991 ◽  
Vol 227 ◽  
Author(s):  
J. A. Moore ◽  
Ji-Heung Kim
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
High Temperature ◽  
Dielectric Constants ◽  
Condensation Polymerization ◽  
Aromatic Diamines ◽  
Excellent Thermal Stability ◽  
Good Solubility ◽  
Flexible Films ◽  
By Products

ABSTRACTA series of new poly(enaminonitriles) were synthesized by the condensation polymerization of three different bis(chlorodicyano-vinyl) aromatic monomers with various aromatic diamines. These polymers have moderate to high molecular weight with intrinsic viscosities ranging from 0.35 to 0.77 dl/g and form flexible films. These polymers exhibit good solubility in many organic solvents and excellent thermal stability, retaining their weight up to 400 °C in air. Poly(enaminonitriles) undergo ‘curing’ reactions at high temperature (˜300 °C) to provide insoluble, infusible material without emission of volatile by-products. Dielectric constants of these polymers ranged from 3.5 to 5.2 depending on the structure. Their thermal and dielectric properties are correlated to the structures.

Novel fluorinated hyperbranched polyimides with excellent thermal stability, UV-shielding property, organosolubility, and low dielectric constants

2017 ◽  
Vol 30 (7) ◽  
pp. 872-886 ◽  
Author(s):  
Qing Li ◽  
Shulai Zhang ◽  
Guangfu Liao ◽  
Changfeng Yi ◽  
Zushun Xu
Keyword(s):  
Thermal Stability ◽  
Tensile Modulus ◽  
Contact Angles ◽  
Dielectric Constants ◽  
Condensation Polymerization ◽  
Excellent Thermal Stability ◽  
Good Thermal Stability ◽  
Uv Shielding ◽  
Air Atmosphere ◽  
Hyperbranched Polyimides

A novel fluorinated aromatic triamine, named 1,3,5-tris (4-(2-trifluoromethyl-4-aminophenoxy)phenyl) benzene (TTFAPOPB), with several –CF3 groups, prolonged chain segments, and ether bonds was first successfully synthesized via a three-step reaction. Then a series of fluorinated hyperbranched polyimides (FHBPIs) with terminal amino or anhydride groups were prepared by condensation polymerization, which were derived from three commercial dianhydrides and the obtained triamine. The prepared FHBPIs showed excellent optical properties with the transmittance reaching 94.5% at 800 nm, favorable ultraviolet (UV)-shielding property with only 27% photodegradation of methylene blue solution after intense UV irradiation for 50 min, good thermal stability with glass transition temperature between 225°C and 264°C, and 10% weight loss temperature of 520–555°C and 509–541°C, respectively, in nitrogen and air atmosphere. They also exhibited relatively good mechanical properties with tensile strength, tensile modulus, and elongation at break values of 64.2–84.2 MPa, 1.2–1.5 GPa, and 6–10%, respectively. Moreover, the introduction of –CF3 and hyperbranched architecture reduced the dielectric constants of the FHBPIs to 2.69–2.92 and increased the surface contact angles to more than 98°. Thus, the FHBPIs are promising dielectric or UV-shielding materials.

A Novel Cement Fluid Loss Additive P1402

2014 ◽  
Vol 941-944 ◽  
pp. 1203-1207 ◽  
Author(s):  
Qiang Xiao ◽  
Wen Fa Xiao ◽  
Xin Xin Liu
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
High Temperature ◽  
Reaction Time ◽  
Performance Testing ◽  
Fluid Loss ◽  
Solution Polymerization ◽  
Excellent Thermal Stability ◽  
Aqueous Solution Polymerization ◽  
Fluid Loss Additive

A novel cement fluid loss additive P1402, which synthesized using the monomers of 2-acrylamido-2-methyl-propane sulphonic acid (AMPS), acrylic acid (AA), N,N dimethyl acrylamide (DMAM) and N-Vinyl-2-pyrrolidone (NVP) by the method of aqueous solution polymerization. The ratio of monomers AMPS:AA:DMAM:NVP at 2:1.5:1:1, reaction PH at 10.8, reaction temperature at 65°Cand reaction time about 5 hours. The IR spectrum of P1402 show that the polymer with the structure of all the monomers .The fluid loss performance testing show that the forpolymers P1402 has an excellent thermal stability. The fluid loss additive P1402 has an excellent tolerance to salt and high temperature.

scholarly journals Glycol-functionalized ionic liquids for high-temperature enzymatic ring-opening polymerization

RSC Advances ◽  
2018 ◽  
Vol 8 (63) ◽  
pp. 36025-36033 ◽  
Author(s):  
Hua Zhao ◽  
Lennox O. Afriyie ◽  
Nathaniel E. Larm ◽  
Gary A. Baker
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ionic Liquids ◽  
High Temperature ◽  
High Molecular Weight ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
High Thermal Stability ◽  
Polymerization Reaction

New glycol-functionalized ionic liquids exhibit high thermal stability and are lipase-compatible, leading to a high molecular weight of polyester in the enzymatic ring-opening polymerization reaction.

scholarly journals Synthesis, characterization and properties of phthalonitrile-etherified resole resin

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 500-509
Author(s):  
Dayong Zhang ◽  
Xiaohui Liu ◽  
Xuefeng Bai ◽  
Yinyin Zhang ◽  
Gang Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Weight Loss ◽  
High Temperature ◽  
Room Temperature ◽  
Curing Temperature ◽  
Scanning Calorimetry ◽  
Excellent Thermal Stability ◽  
Bonding Properties ◽  
New Type

AbstractA new type of phthalonitrile-etherified resole resin (PNR) was synthesized from resole resin and 4-nitrophthalonitrile. The differential scanning calorimetry results showed that the curing temperature of PNR is lower than that of phthalonitrile resin. Excellent thermal stability and bonding properties were obtained after curing at 220°C. TGA showed that in air, the temperature of 5% weight loss (T5%) of the cured PNR was 446°C, approximately 41°C higher than that of resole resin (RS), and the char yield at 800°C increased from 4% for RS to 33% for PNR. The shear strengths of PNR at room temperature and high temperature were increased by 8% and 133%, respectively, over those of RS, and after aging at 350°C for 2 h, these values were increased by 262% and 198%, respectively, over those of RS. Its excellent curing behavior, heat resistance and high bonding strength show that PNR can be used as a high temperature-resistant adhesive.

scholarly journals Preparation and Characterization of Narrow Size Distribution PMSQ Microspheres for High-Frequency Electronic Packaging

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4233
Author(s):  
Guodong Meng ◽  
Yimeng Li ◽  
Zhengdong Wang ◽  
Cheng Pan ◽  
Wenwu Gao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Size Distribution ◽  
Electronic Packaging ◽  
High Frequency ◽  
Electronic Circuit ◽  
Dielectric Constants ◽  
Circuit Board ◽  
Narrow Particle Size Distribution ◽  
Excellent Thermal Stability

Polymethylsilsesquioxane (PMSQ) has become a kind of widely studied filler used in the electronic circuit board substrates due to its organic–inorganic hybrid structure, low dielectric constant, and good thermal stability, among other factors. Herein, the PMSQ microspheres were prepared by a two-step acid–base-catalyzed sol–gel method; the influences of reaction conditions including the ratio of water/methyltrimethoxysilane (MTMS), reaction temperature, concentration of the catalyst, and stirring time were systematically investigated; and the optimized reaction condition was then obtained towards a narrow particle size distribution and good sphericity. The microstructure of PMSQ microspheres was analyzed by the infrared spectrum and X-ray diffraction (XRD), which indicated that the as-prepared PMSQ had a ladder-dominant structure. The thermogravimetric analysis (TGA) demonstrated an excellent thermal stability of as-prepared PMSQ microspheres. More specifically, the dielectric constants at high frequency (1~20 GHz) of as-prepared PMSQ microspheres were measured to be about 3.7, which turned out a lower dielectric constant compared to SiO2 powder (≈4.0). This study paves the way to further improve the performance of the electronic circuit board substrates for the application of high-frequency electronic packaging.

Aromatic Poly(ether imide oxadiazole)s

1992 ◽  
Vol 4 (2) ◽  
pp. 73-80 ◽  
Author(s):  
F. W. Mercer
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Aprotic Solvent ◽  
Dielectric Constants ◽  
Aromatic Diamines ◽  
Glass Transition Temperatures ◽  
Good Thermal Stability ◽  
Polar Aprotic Solvent ◽  
Carbonate Reaction ◽  
Poly Imide

Two oxadiazole containing aromatic diamines were synthesized. The diamines were prepared by reaction of aminophenols with 2,5-bis(4-fluorophenyl)-4l3,4-oxadiazole in a polar aprotic solvent in the presence of potassium carbonate. Reaction of the resulting 2,5-bis(4-(aminophenoxy)phenyl)-1,3,4-oxadiazoles with dianhydrides gave a series of polymeric amic acids. Thermal treatment yielded poly(imide ether oxadazole) films which displayed good thermal stability, flexibility, and glass transition temperatures ranging from 241 to 344C. The dielectric constants of the films were characterized as a function of relative humidity.

scholarly journals High performance polyimides with good solubility and optical transparency formed by the introduction of alkyl and naphthalene groups into diamine monomers

RSC Advances ◽  
2017 ◽  
Vol 7 (65) ◽  
pp. 40996-41003 ◽  
Author(s):  
Tianyun Li ◽  
Huahua Huang ◽  
Lei Wang ◽  
Yongming Chen
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Optical Transparency ◽  
Excellent Thermal Stability ◽  
Microwave Assisted ◽  
Good Solubility ◽  
Optically Transparent ◽  
Diamine Monomer

Highly soluble and optically transparent polyimides with excellent thermal stability were prepared by the introduction of alkyl and naphthalene groups into a single diamine monomer under microwave-assisted polymerization.

Steric and electronic modulation of iron catalysts as a route to remarkably high molecular weight linear polyethylenes

2019 ◽  
Vol 48 (47) ◽  
pp. 17488-17498 ◽  
Author(s):  
Randi Zhang ◽  
Mingyang Han ◽  
Yanping Ma ◽  
Gregory A. Solan ◽  
Tongling Liang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Iron Catalysts ◽  
Excellent Thermal Stability

The depicted N,N,N-iron(ii) chloride precatalysts, upon activation with either MAO or MMAO, not only display excellent thermal stability but are also capable of generating exceptionally high molecular weight linear polyethylenes.

High Temperature Stability of MGC’s Gas Turbine Components in Combustion Gas Flow Environments

2005 ◽  
Author(s):  
Narihito Nakagawa ◽  
Hideki Ohtsubo ◽  
Kohji Shibata ◽  
Atsuyuki Mitani ◽  
Kazutoshi Shimizu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Gas Flow ◽  
Temperature Stability ◽  
High Temperature Strength ◽  
High Temperature Stability ◽  
Exposure Test ◽  
Excellent Thermal Stability ◽  
Combustion Gas ◽  
Flow Environment

Melt growth composites (MGCs) have a unique microstructure, in which continuous networks of single-crystal phases interpenetrate without grain boundaries. Therefore, the MGCs have excellent high-temperature strength characteristics, creep resistance, oxidation resistance and thermal stability in an air atmosphere at very high temperature. In order to investigate the recession behavior of MGCs in combustion gas flow environment, we have just started the exposure tests to evaluate the influence of combustion gas flow environment on MGCs. The MGCs have about 95% of the initial flexural strengths after the exposure test for 10 hours at T = 1500 °C, P = 0.1–0.3 MPa, V = 150–250 m/s, PH2O = 15–45 kPa in the combustion gas flow environment. MGCs have excellent thermal stability and water vapor resistance in comparison with conventional ceramic materials such as Si3N4 and Al2O3 under the high temperature combustion gas flow environment.

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