Preparation of Janus nanoparticles from block copolymer thin films using triazolinedione chemistry

Abstract

A nanostructured thin film obtained from a polystyrene-block-poly(4-vinylpyridine) diblock copolymer was used as a template to produce Janus-type nanoparticles via triazolinedione-ene click chemistry.

Click chemistry strategies for the accelerated synthesis of functional macromolecules

“…This is an opportunity as main reaction partner of TAD are alkene and electron rich aromatic systems, which are abundant in both natural and synthetic polymers. TAD crosslinking applications can therefore involve (i) Alder-ene reaction with polymer containing isolated alkene 180,492,493 or indole, 177,178 (ii) DielsÀAlder reaction 494 with polymer containing conjugated diene, 174,180,181,494,495 and (iii) electrophilic aromatic substitution with phenol in polypeptide containing tyrosine derivatives. 172 The reversible bond between indole and TAD in Alder-ene reaction has inspired the "transclick" concept.…”

Microgels as Smart Polymer Colloids for Sensing and Environmental Remediation

“…Polymer colloids are an important class of materials due to their widespread applications. − There are numerous examples of colloidal nanoparticles, such as hard cross-linked nanoparticlesresembling a hard-sphere-like behavior with very little deformability; intermediate soft nanomaterials; and soft self-assembled polymer coils, which are easily deformable but possess less structural integrity. − Microgels are a class of solvated micrometer- to nanometer-sized (often termed as nanogels, if the diameter is typically below 100 nm) cross-linked colloidal particles comprising intermediate properties between hard particles and linear solvated polymer coils in a good solvent. − The extent of their hard colloid or macromolecular character is generally regulated by their degree of cross-linking . In the collapsed stage their hard-sphere-like behavior dominates, while, in the swollen stage, they resemble a soft macromolecular coil-like structure with dangling chains on the surface. , The “soft” nature defines its ease of deformability, while retaining its structural integrity.…”