Molecular approach to the development of polyimides with novel structures and properties

Wang, Zhi Yuan; Bender, Timothy P.; Zheng, Hai Bin; Chen, Lian Zhou

doi:10.1002/1099-1581(200008/12)11:8/12<652::aid-pat16>3.0.co;2-2

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…119 Those helicene-based polymers have been investigated since the mid 1990's as almost exclusively polyimides. 120 In 1995, a high-temperature polyimides polymer based on thermal polymerization of several diamines with [5]helicene-5,6,9,10-tetracarboxylic 5,6,9,10-dianhydride was reported. 121 However, the group of Wang in Ottawa was the most involved in the preparation and the characterization of many [5]helicenebased polyimide polymers.…”

Section: Helicene-based Polymers and Copolymersmentioning

confidence: 99%

One hundred years of helicene chemistry. Part 3: applications and properties of carbohelicenes

2013

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Carbohelicenes are a class of fascinating chiral helical molecules which have a rich history in chemistry. Over a period of almost 100 years, chemists have developed many methods to prepare them in a racemic or in a non-racemic form. They also possess a series of interesting chiral, physical, electronic and optical properties. However, their utilization in chemistry or chemistry-related fields has rarely appeared in a detailed and comprehensive review. It is the purpose of this review to collect fundamental applications and functions involving carbohelicenes in various disciplines such as in materials science, in nanoscience, in biological chemistry and in supramolecular chemistry. From the numerous synthetic methodologies reported up to now, carbohelicenes and their derivatives can be tailor-made for a better involvement in several subfields. Among those domains are: nanosciences, chemosensing, liquid crystals, molecular switches, polymers, foldamers, supramolecular materials, molecular recognition, conductive and opto-electronic materials, nonlinear optics, chirality studies and asymmetric synthesis. Helicene chemistry is now at a developmental stage, where sufficient application data are now collected and are extremely useful. They provide many more ideas for setting up the basis for future innovative applications.

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Section: Helicene-based Polymers and Copolymersmentioning

confidence: 99%

One hundred years of helicene chemistry. Part 3: applications and properties of carbohelicenes

2013

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“…Because of the lower reactivity of aromatic amines, in comparison to aliphatic amines, this type of reaction offers certain advantages. When the less basic 2-aminopyridine terminates imide oligomers, this amine can be readily exchanged for other aromatic diamines to form a high molecular weight polyimide through proper stoichiometric control (151)(152)(153)(154). This scenario allows for the formation of otherwise infusible polyimides, via melt processing techniques, and also permits the incorporation of chemical moieties that are susceptible to hydrolysis via the polyamic acid route.…”

Section: Polyimides Via Polymer Conversion One Methods Has Already Beenmentioning

confidence: 99%

Polyimides

Bryant¹

2002

Encyclopedia of Polymer Science and Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five‐ or six‐membered ring. Polyimides are noted for their mechanical properties, chemical resistance, and dielectric strength. They exist as thermoplastics and thermosets. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin‐walled tubing, molding resins, and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba, and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco, and GE), polybenzimidazoles (Hoechst‐Celanese), and some high T g filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance make them suitable for use in high performance applications where failure and replacement costs are high.

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“…From a synthetic point of view, by self-condensation of AB-type monomers one can avoid the strict stoichiometric control, which is required in AA/BB polycondensation systems [28][29][30][31][32][33][34][35][36][37][38][39]. The requirement of stoichiometric equivalence to obtain high molecular weight is easily met using AB-type monomers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of high performance poly(thioether imide)s via aromatic nucleophilic substitution reaction of isomeric AB-type monomers

2015

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A series of isomeric poly(thioether imide)s (PTIs) containing thioether linkages were prepared by aromatic nucleophilic substitution reaction of isomeric N-(4-mercaptophenyl)-3-chlorophthalimide and/or N-(4-mercaptophenyl)-4-chlorophthalimide. The inherent viscosities of these polymers were in the range of 0.38-0.42 dL/g. The glass transition temperature increased with increasing the content of 3-substituted phthalimide unit in the polymer backbone. The 5 % weight loss temperatures of isomeric PTIs (a-e) were 506-531°C in nitrogen and 509-536°C in air, respectively. The isomeric PTIs (b-d) films exhibited good mechanical properties with tensile strength of about 90 MPa, elongation at break of more than 6.0 %, and tensile moduli of more than 2.2 GPa. The storage moduli of PTIs (b-d) almost completely maintained at about 2.0 GPa before reaching the corresponding glass transition temperatures. It is noted that the minimum melt viscosity of these polymers decreased with increasing the content of unsymmetrical 3-and 4-substituted phthalimide unit.

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Molecular approach to the development of polyimides with novel structures and properties

Cited by 12 publications

References 17 publications

One hundred years of helicene chemistry. Part 3: applications and properties of carbohelicenes

One hundred years of helicene chemistry. Part 3: applications and properties of carbohelicenes

Polyimides

Synthesis and characterization of high performance poly(thioether imide)s via aromatic nucleophilic substitution reaction of isomeric AB-type monomers

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