Remarkable untangled dynamics behavior of multicyclic branched polystyrenes

Abstract

The largest mesh size ξ of a multicyclic branched polymer network results in special microrheological behavior and unique viscosity modification applications in solution.

Molecular Engineering of Injectable, Fast Self-Repairing Hydrogels with Tunable Gelation Time: Characterization by Diffusing Wave Spectroscopy

“…Then, the ⟨Δ r 2 (τ)⟩ was obtained by numerically solving the following equations (eq ) ,− where z 0 is the distance of the sample from the incident surface to the place where the diffuse source is located, L is the thickness of the sample, and l * is the sample transport mean free path of the scattered light. k 0 = 2π/λ, and λ is the laser wavelength.…”

Efficient Synthesis and Cyclic Molecular Topology of Ultralarge-Sized Bicyclic and Tetracyclic Polymers

“…Multicyclic polymers have emerged as one of the most promising classes of cyclic polymers because of their complex structures and some uncertain properties. 78 1), respectively. The M n of the tetracyclic polymer (M n,c = 59.6 kg mol −1 ) was lower than that of the four-arm polymer (M n,a = 71.8 kg mol −1 ) (Figure S29).…”

“…Multicyclic polymers have emerged as one of the most promising classes of cyclic polymers because of their complex structures and some uncertain properties. − A tetracyclic polymer c -{ PTNBP 5 -[( b - PTNP 80 ) 4 -( b - PBNP 5 ) 2 ] 2 } was also prepared by successive ROMP via the further alternating addition of monofunctional TNP and difunctional BNP from bicyclic c -[ PTNBP 5 -( b - PTNP 80 ) 4 -( b - PBNP 5 ) 2 ] with four living chain ends (Scheme S5), benefiting from the diversified blocking-cyclization technique and tetrafunctional TNBP . From the 1 H NMR spectra (Figure S28), the actual ratios of [ PTNBP ]/[ PTNP ]/[ PBNP ] were calculated to be 5:616:20 and 5:600:20 for tetracyclic c -{ PTNBP 5 -[( b - PTNP 80 ) 4 -( b - PBNP 5 ) 2 ] 2 } and its four-arm counterpart a - PTNBP 5 -( b - PBNP 10 ) 2 -( b - PTNP 160 ) 4 (entries 15 and 16, Table ), respectively.…”

Rational design of a multi-in-one heterofunctional agent for versatile topological transformation of multisite multisegmented polystyrenes

“…First, the reactive sites present in neighboring polymer segments can endow LMMPs with versatile topological transformations via coupling, cleavage and polymerization. For instance, post-polymerization modification (PPM) enables the incorporation of various homo/heterofunctions and polymer segments, 38–43 an intra/interchain linking reaction affords single-chain folding, 16,44–51 hyperbranched 16,52 and cross-linked polymers, and a graft reaction leads to the formation of binary or multicomponent graft copolymers. 53–59 Second, depending on the synthetic methodologies, the chain length and chemical composition of each segment can be rationally adjusted to meet the requirements of the functions and properties of polymer materials.…”

“…63–65 By virtue of coupling reactions such as DA, NRC and hydroxyl-isocyanate 60,62 addition reactions, the resultant LMMPs with stimuli-labile DA, alkoxyamine and urethane linkers are difficult to transform into intrachain folding and branched polymers via intra/intermolecular cross-linking. Starting from some linear and hyperbranched LMMPs, intriguing multisegmented-to-one-segment (with reduced M n ), 16,17 linear/branched-to-intrachain folding (with similar M n ) 16,49,52 and linear/branched-to-graft (with enhanced M n ) 17,65,66 transitions have been achieved. However, the related types of topological transformations are relatively scarce, and it remains a great challenge to construct abundant architectural polymers with reduced, similar and enhanced molar masses via molecular tailoring and structural rearrangement of the same precursor.…”