Modification of negative auto-photosensitive polyimide

Abstract

This article describes the preparation of a kind of auto-photosensitive polyimide (PSPI) that contains organo-silicone moiety in its main chain. A group of novel auto-photosensitive polyimides were prepared based on the aromatic diamine monomers and 3,3Ј,5,5Ј-benzophenontetracarboxylic dianhydride (BTDA) by the method of solution polycondensation at room temperature and imidized at a high temperature. The properties of PSPIs, such as ultraviolet (UV) absorption, electric and adhesion properties, and moisture absorption, were characterized by UV analysis, a dielectric constant detector, and so on. The relationship between the structure and properties of PSPIs is discussed.

Efficient removal of aqueous Pb(II) ions by magnetic alginate composite microcapsules containing canola straw‐derived biochar as the reinforcing fillers

“…The FT‐IR spectroscopy of γ‐Fe 2 O 3 ferrofluid was presented in Figure 3(A). The peaks at 3446, 562, and 445 cm −1 correspond respectively to the hydroxyl group (OH), the associative alcohol hydroxyl groups, and the FeO bond in γ‐Fe 2 O 3 , while the peaks at 1626 and 1386 cm −1 , specifically attributed to the carboxyl (COOH) 44–46 . It shows that the ferrofluid of γ‐Fe 2 O 3 was successfully prepared, and the surface of γ‐Fe 2 O 3 particles was rich in functional groups such as OH and COOH 47 .…”

“…The peaks at 3446, 562, and 445 cm À1 correspond respectively to the hydroxyl group ( OH), the associative alcohol hydroxyl groups, and the Fe O bond in γ-Fe 2 O 3 , while the peaks at 1626 and 1386 cm À1 , specifically attributed to the carboxyl ( COOH). [44][45][46] It shows that the ferrofluid of γ-Fe 2 O 3 was successfully prepared, and the surface of γ-Fe 2 O 3 particles was rich in functional groups such as OH and COOH. 47 The peaks at ν as C=O (1626 cm À1 ) and ν s C=O (1386 cm À1 ), which originally belonged to the carboxyl group on the surface of γ-Fe 2 O 3 particles, migrated to 1591 and 1381 cm À1 , respectively, in the FT-IR spectrum of C-γ-Fe 2 O 3 .…”

A water-borne photo-sensitive polyimide precursor for an eco-friendly process of preparing organic thin film transistors

“…8,10,11 To introduce the photo-functionality in this process, three representative strategies have been proposed: (1) introduction of a photosensitive functional group into the diamine and dianhydride monomer [16][17][18][19] (2) post-polymerization modification of PAA [20][21][22][23][24] and (3) post-polymerization modification of the PI polymers. 20,25,26 In many cases, the structuring process proceeded using PAA because it has better solubility in common organic solvents that leads to processability via a solution-based process. The carboxylic acid groups of PAA also provide sufficient reaction sites to be conjugated with photoreactive functional groups via covalent or ionic bonding.…”

A photoinitiator‐free photosensitive polyimide with low dielectric constant

“…In fact, only a little part of photoinitiators can be used in illumination process, resulting in a large amount of photoinitiator residues, which leads to decrease the thermal, mechanical, and electrical properties of the PSPIs. Therefore, photoinitiator‐free photosensitive polyimides are highly desired to overcome this problem 9–11…”