Click construction of spiro- and bridged-quatrefoil polymer topologies with kyklo-telechelics having an azide group.
Unprecedented tetracyclic polymer topologies with spiro- and a bridged-type quatrefoil forms are effectively constructed through an alkyne-azide, click-linking reaction by employing a kyklo-telechelic poly(tetrahydrofuran), poly(THF), precursor having an azide group, obtained through an electrostatic self-assembly and covalent fixation (ESA-CF) process, and complementary tetrafunctional alkyne reagents of either a pentaerythritol derivative or a four-armed star telechelic polymer precursor.
Tailored Synthesis of Branched and Network Polymer Structures by Electrostatic Self-Assembly and Covalent Fixation with Telechelic Poly(THF) Having N-Phenylpyrrolidinium Salt Groups
Uniform size poly(THF)s having N-phenylpyrrolidinium salt as a single and both end groups (1 and 2) were synthesized as a reactive precursor to produce star polymers, polymacromonomers, and model n...
Multicyclic polyethers derived from 1,1,1‐tris(4‐hydroxyphenyl)ethane and 2,6‐dihalopyridines
Poly(pyridine ether)s were prepared in two ways: the polycondensation of silylated 1,1,1-tris(4-hydroxyphenyl)ethane (THPE) with 2,6-difluoropyridine (method A) and the polycondensation of free THPE with 2,6-dichloropyridine (method B). With method A, the THPE/difluoropyridine feed ratio was varied from 1.0:1.0 to 1.0:1.6. Cycles, bicycles, and multicycles were the main reaction products, and crosslinking was never observed. When ideal stoichiometry was used exclusively, multicycles free of functional groups were obtained. These multicycles were detectable in matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectra up to B 38 C 76 with a mass of approximately 32,000 Da. With method B, the reaction conditions were varied at a fixed feed ratio to achieve an optimum for the preparation of multicyclic polyethers, but because of the lower reactivity of 2,6-dichloropyridine, a quantitative conversion was not achieved. The reaction products were characterized with MALDI-TOF mass spectrometry, viscosity measurements, and size exclusion chromatography.