Polybenzoxazines in fabrication of separation membranes: A review

Preparation of polybenzoxazine/resorcinarene composites with low dielectric constants

“…Polybenzoxazine (PBZ) is a thermosetting resin with low water absorption, high thermal stability and relatively low dielectric constant. [1][2][3] To meet the requirement of microelectronic field applications, several methods have been reported to further reduce the dielectric constant of PBZ. Low-polarity groups, such as fluorinated groups 4 and siloxane, 5 are introduced to decrease the molar polarizability of the polymers.…”

Exploiting the reversible covalent bonding of boronic acids for self-healing/recycling of main-chain polybenzoxazines

“…2 Therefore, research interest in PBzs and related materials is apparently increasing in polymer and materials science as reflected by the number of scientific publications and patents. 3 Many of the above-stated properties are due to the chain conformations arising from Mannich base bridges (-CH 2 -N(R)-CH 2 -), and the intra-and intermolecular hydrogen bonds between amine and phenolic -OH groups. 4 PBzs are obtained from their corresponding 1,3-benzoxazine (Bz) monomers and the polymerization proceeds by a thermally driven cationic ring opening process (ROP) under either catalytic or non-catalytic conditions.…”

“…2 Therefore, research interest in PBzs and related materials is apparently increasing in polymer and materials science as reflected by the number of scientific publications and patents. 3 Many of the above-stated properties are due to the chain conformations arising from Mannich base bridges (–CH 2 –N(R)–CH 2 –), and the intra- and intermolecular hydrogen bonds between amine and phenolic –OH groups. 4…”

A Simple Solvent-Free Strategy of Polybenzoxazine Film Elaboration with Controllable Performance via Molecular Weight Regulation between Cross-Linking Knots

“…The use of functional monomers is the most widely used approach due to the simplicity of their synthesis. In this case, bifunctional monomers containing two benzoxazine fragments (i.e., bifunctional monomers) are mostly used to obtain PBzs with the desired properties. ,, At the same time, monomers with one benzoxazine moiety are less often used owing to the high fragility of the obtained materials . Nevertheless, such monomers found their use as effective modifying agents for other polymers and materials used for different applications.…”

“…Polybenzoxazines (PBzs), as well as materials based on them, hold a special place among highly cross-linked thermosetting resins. − A number of unique properties of PBz (high thermal and chemical stability, fire resistance, hydrophobicity, low values of the thermal expansion coefficient, friction coefficient, dielectric constant, etc.) combined with the simplicity of their synthesis make these polymers promising for use in different fields, such as electronics, membrane separation, and aerospace engineering. , In addition, the PBz preparation is relatively “green” as compared, for example, with the classical phenolic resin preparation due to the reactive nature of their monomers, high atom economy, and absence of byproduct emissions. , However, PBzs have some disadvantages, namely, their high curing temperature (above 200 °C) and brittleness (common for many thermosets), which degrade their properties, particularly the impact resistance. − Generally, there are several ways to improve the mechanical properties. Among them are introducing flexible aliphatic fragments and “hinge groups” such as −O– or/and −S–, in the PBz structure .…”