Molecular design and synthesis of thermotropic liquid crystalline poly(amide imide)s with high thermal stability and solubility

Polymer Engineering & Sci

et al. 2018

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Recently, multifunctional films are of particular interest to scientists owing to their diversified properties. Here, we demonstrated that self‐cleaning, self‐extinguishing, and high conductive films were fabricated by simple solvent‐casting method from poly(amide‐imide)/polyaniline composites. The multifunctional films exhibited controllable water contact angles varying from 65° to 120° and high electrical conductivities of over 40 S m−1. Moreover, due to the improved hydrophobicity, the multifunctional films showed self‐cleaning characteristics and were used to collect the dust powders easily and perfectly during the dispensed water droplet rolling off the solid surface. Furthermore, the self‐extinguishing property of the multifunctional films was confirmed by thermogravimetric analysis. The special film composition and morphology are the two important aspects that induce such unusual properties. The polyaniline content can strongly influence the morphology of the composite films, which in turn display different hydrophobicities and conductivities. POLYM. ENG. SCI., 59:E33–E43, 2019. © 2018 Society of Plastics Engineers

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile preparation of multifunctional poly(amide‐imide)/polyaniline films: Combining self‐cleaning, self‐extinguishing, and conductive

Polymer Engineering & Sci

et al. 2018

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“…As shown in Figure 1, aromatic PAI was prepared from diimide diacid and diamine through a Yamazaki–Higashi phosphorylation reaction [7,17], and their structures were confirmed by H-NMR as shown in Figure 2 and Figure 3.…”

Section: Methodsmentioning

confidence: 99%

“…For most of the polymeric materials in our life, their conductivities are very low because a cluster of free electrons could not flow along their backbones. For example, poly(amide-imides) (PAIs) possessing good mechanical and thermal properties have been considered to be excellent engineering materials, but their application in the conductive field has been limited due to their poor conductivity [7,8,9,10,11]. The insulator–conductor transition could be achieved by incorporating conductive fillers into the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Highly Conductive Poly(amide-imide) Composite Films beyond 1000 S m−1 through Ternary Blend Strategy

et al. 2019

Polymers

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Highly conductive thin films with suitable mechanical performances play a significant role in modern electronic industry. Herein, a series of ternary conductive polymer composites were fabricated by incorporating carbon black (CB) into binary conductive polymer composites of poly(amide-imide) (PAI) and polyaniline (PANI) to enhance their mechanical and conductive properties simultaneously. By varying the composition of PAI/PANI/CB ternary films, the conductivity enhanced by two orders of magnitude compared with the sum of PAI/PANI and PAI/CB binary conductive polymer composites, and a high conductivity of 1160 S m−1 was achieved. The improved conductivity is mainly because much more continuous conductive networks were constructed in the ternary conductive polymer composites. With the help of the unusual morphology, the tensile strength was also enhanced by more than 80% from 21 to 38 MPa. The origin for the improved morphology was discussed for further improvement.

“…PAIs (PAI-GABA, PAI-EACA, and PAI-OAUA) were synthesized by phosphorylation polycondensation in accordance with the literature. 22 –27 The synthetic route of PAIs is illustrated in Figure 2. The experimental details are described as below using PAI-EACA as an example.…”

Section: Methodsmentioning

confidence: 99%

Influence of structural modification on the properties of poly(amide–imide)s

Polymers and Polymer Composites

et al. 2019

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In this study, the influence of length of flexible groups on the properties of poly(amide–imide)s (PAIs), three-model polymers (poly(amide–imide)-4-aminobutyric acid, poly(amide–imide)-6-aminocaproic acid, and poly(amide–imide)-11-aminoundecanoic acid) possessing different flexible methylene units ((CH2)3, (CH2)5, and (CH2)10) in the main chain were designed. With increasing the number of methylene units, it is found that the tensile strength of PAIs decreased from 75 MPa to 55 MPa; meanwhile, the elongation at break increased from 6% to 15%. On the other hand, the glass transition temperature decreased from 207°C to 112°C; fortunately, the starting decomposition temperature kept almost same with a high point around 400°C. Furthermore, the PAI with (CH2)10 unit in the main chain is a semicrystalline polymer, while the one with (CH2)5 or (CH2)3 unit is an amorphous material. In other words, the length of the flexible chain in the polymer backbone not only plays an important role in mechanical and thermal performances but also affects their phase transition. These findings highlight the important role of structural modification in high-performance polymers and may help in the further development of novel PAIs for their potential applications in advanced technology.