The Effect of Molecular Isomerism on the Barrier Properties of Polyimides: Perspectives from Experiments and Simulations

Liu, Yiwu; Xie, Fengyun; Huang, Jie; Tan, Jinghua; Chen, Cheng-Liang; Jiang, Linbing; Zhang, Ye

doi:10.3390/polym13111749

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…Moreover, the flat nature of 3BAO structure, , which is very similar to that of 4BAO, allows us to attribute any difference in gas permeation properties observed to the linkage position only. Similar studies have been performed on poly(etherimide)s, polyimides, − thermally rearranged polymers, and poly(benzoxazole- co -imide) . A 3D representation of the imide ring region where the linkage occurs is illustrated in Figure a,c.…”

Section: Introductionmentioning

confidence: 59%

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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The design of new polymeric materials and the search for new classes of polymers for industrial application in membrane-based gas separation have been the focus of several research groups worldwide. Membranes with high productivity and efficiency under harsh operational conditions of pressure and temperature during mixed-gas separation are of great interest. In this paper, we report the preparation of a series of block copolymers of poly(imide−oxadiazole)s built from 6FDA, Durene, and four different 1,3,4-oxadiazole-based monomers. The pureand mixed-gas separation properties of their corresponding membranes were measured. The mixed-gas separation data were collected at a high feed pressure of up to 900 psi. Such mixed-gas separation testing under harsh conditions is required to subject the membranes to environments similar to industrial use. For example, the mixed-gas CO 2 permeability of 6FDA-Durene/6FDA-4BAO(Me) (3:1) was measured at 900 psi to be ∼130 barrer, and the CO 2 /CH 4 selectivity is around ∼24. These results of permeability and selectivity of poly(imide−oxadiazole) membranes at such high gas feed pressure are considered very attractive and are superior to many glassy polymers reported in the literature and that are industrially observed membranes. This work illustrates well a case scenario of structure−property relationship and demonstrates the exclusivity of mixed-gas testing which could not be predicted from the ideal situation of pure-gas testing. In the near future, the mixed-gas separation properties of thin layer composite and hollow fibers will be evaluated.

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Section: Introductionmentioning

confidence: 59%

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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“…TPCPDFPPI displayed a weak and wide dispersing peak, implying its amorphous feature 42 . This was chiefly due to the incorporation of propeller‐shaped moiety and CF 3 units, which increased interchain spacing and disrupted the regularity of PI chains, thereby hindering the crystallization of PI 43,44 . As a result, the solubility of TPCPDFPPI was significantly improved.…”

Section: Resultsmentioning

confidence: 99%

Design, synthesis, and properties of soluble intrinsic black polyimide bearing tetraphenylcyclopentadienone units

Tan,

Shen,

Huang

et al. 2023

Journal of Polymer Science

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Black polyimides (BPIs) have gained increasing attention because of their growing demands in optoelectronic areas. However, the commonly used BPI containing carbon black suffers from the decreases of mechanical and electrical performances. In this work, a soluble intrinsic BPI (TPCPDFPPI) was prepared by the reaction of 4,4′‐(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and a new diamine (TPCPDFPDA) bearing tetraphenylcyclopentadienone (TPCP) connected with benzene and fluorene units. TPCP grafted with benzene and fluorene units acted as a chromophore that shifted the absorption range of PI toward the long‐wave direction. The resulting TPCPDFPPI possessed whole visible‐light absorption characteristic and therefore exhibited high blackness and opacity. Additionally, TPCPDFPPI displayed superior solubility, mechanical and electrical performance. Theoretical calculations exhibited that the visible‐light absorption responsible for the blackness of TPCPDFPPI was chiefly ascribed to the HOMO to LUMO electron transition in the diamines, where the electrons were primarily migrated from the 2,5‐position aryl groups to the cyclopentadienone. This work offers a promising strategy for improving the overall properties of BPIs for photo‐electronic areas.

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“…In particular, we obtained 1.1 × 10 1 , 4.7 × 10 1 , 1.6 × 10 2 g m −2 d −1 , for 0%, 20%, and 50% pre-strain, respectively. Since the previous tests demonstrated a good Mg mechanical integrity at these strains, the effect of stretching-enhanced water permeation may be attributed to a larger free-void volume in the polymeric barriers, [58][59][60] to possible micro-delamination between PDMS and PI, or to the temporarily reduced thickness of the encapsulation during to the deformation, which allows water to penetrate through the encapsulation more rapidly. Additionally, the stress relaxation in the polymers (Figure 5g), the redistribution of stresses, and the plastic deformation around Mg (which occurs rapidly) can play a role in accelerating the water diffusion and the Mg corrosion.…”

Section: Stretchable E-mg Test Cardsmentioning

confidence: 90%

Magnesium Test: Universal and Ultra‐Sensitive Method for Measuring Reliability of Thin‐Film‐Encapsulated Bioelectronic Implants in Physiological Environment

Mariello,

Ayama,

et al. 2024

Adv Funct Materials

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Next‐generation bioelectronic implants require miniaturization, durability, and long‐term functionality. Thin film encapsulations, prepared with inorganic or hybrid organic/inorganic designs, are essential for ensuring protection, low water permeation, adaptability, and structural strength. It is equally important to precisely measure their barrier performance, especially for in vivo use, to ensure the manufacture of reliable bioelectronics. Current monitoring solutions are not adequate: they are bulky, lack sensitivity, and are incompatible with microfabricated devices. Here, a comprehensive method is introduced to quantify the permeability of thin‐film encapsulation for bioelectronic implants both in situ and in real time. This method relies on monitoring the electrical resistance of the Mg film, which experiences corrosion due to water permeation, leading to Mg hydrolysis. An analytical model is proposed that predicts and quantifies this permeation, and is adaptable for various types of encapsulations, including hybrid multilayers. An unprecedented ultra‐low detection limit of 3 × 10−8 g m−2 d−1 at room temperature is demonstrated and the monitoring approach is validated in vivo using polyimide and poly(dimethylsiloxane)‐coated bioelectronics.

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The Effect of Molecular Isomerism on the Barrier Properties of Polyimides: Perspectives from Experiments and Simulations

Cited by 9 publications

References 43 publications

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Design, synthesis, and properties of soluble intrinsic black polyimide bearing tetraphenylcyclopentadienone units

Magnesium Test: Universal and Ultra‐Sensitive Method for Measuring Reliability of Thin‐Film‐Encapsulated Bioelectronic Implants in Physiological Environment

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