Non‐covalent interactions of pyrene end‐labeled star poly(ɛ‐caprolactone)s with fullerene

Abstract

Pyrene end-labeled star poly(E-caprolactone)s (PCLs) with polyhedral oligomeric silsesquioxane (POSS) core were prepared by combination of copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry and ring-opening polymerization techniques. First, E-caprolactone (E-CL) is polymerized by using 1-pyrene methanol as initiator and stannous octoate as catalyst to obtain a-pyrene-x-hydroxyl telechelic PCL with different chain lengths. Then, its hydroxyl group is converted to acetylene functionality by esterification reaction with propargyl chloroformate. Finally, the CuAAC click reaction of a-pyrene-x-acetylene telechelic PCL with POSS-(N 3 ) 8 leads to corresponding pyrene end-labeled star-shaped PCLs. The successful synthesis of pyrene end-labeled star polymers is clearly confirmed by 1 H-nuclear magnetic resonance, Fourier transform infrared, gel permeation chromatograph, differential scanning calorimeter, and thermogravimetric analysis. Furthermore, non-covalent interactions of obtained star polymers with fullerene are investigated in liquid media. Based on Raman spectroscopy and visual investigations, the star polymer having shorter chain length exhibited better and more stable dispersion with fullerene. The amount of pyrene units present per polymer chains can directly influence the dispersion stability of fullerene.

Synthesis of Silsesquioxanes with Substituted Triazole Ring Functionalities and Their Coordination Ability

“…Due to the interesting photoelectronic properties of SQs-based systems with aryl-triazole groups, they could be possibly used as luminescent materials with enhanced thermal resistance [ 29 , 41 , 43 , 44 , 45 ]. One of the promising branches of their application is materials chemistry, e.g., as polymers or dendrimers modifiers/synthons [ 30 , 39 , 42 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. They may be also found in macromolecular SQs-based surfactants of amphiphilic and self-assembly or encapsulation properties [ 31 , 55 , 56 ].…”

Effects of hetero‐armed star‐shaped PCL‐PLA polymers with POSS core on thermal, mechanical, and morphological properties of PLA

“…3.1 | Characterization of SPLA and its precursors SPLA polymers were prepared via "arm first" approaches utilizing combination of ROP and Cu(I)-catalyzed alkyneazide cycloaddition (CuAAC) click reaction starting from clickable alkyne-functionalized polymers (alkyne-PLA and alkyne-PCL) and POSS-(N 3 ) 8 that were separately synthesized via well-known methods. 4,[39][40][41] The preparation of eight-armed star-shaped polymers having PLA and PCL PLA arms (1:1 molar ratio) with different chain lengths (n = 10, 20, 30, and 50) emanating from a POSS core performed through by three reaction steps. In the first step, clickable POSS-(N 3 ) 8 core was successfully prepared by the arm-first approach utilizing nucleophilic substitution reaction of POSS-(Cl) 8 with sodium azide.…”

“…SPLA polymers were prepared via “arm first” approaches utilizing combination of ROP and Cu(I)‐catalyzed alkyne‐azide cycloaddition (CuAAC) click reaction starting from clickable alkyne‐functionalized polymers (alkyne‐PLA and alkyne‐PCL) and POSS‐( N 3 ) 8 that were separately synthesized via well‐known methods 4,39–41 . The preparation of eight‐armed star‐shaped polymers having PLA and PCL PLA arms (1:1 molar ratio) with different chain lengths ( n = 10, 20, 30, and 50) emanating from a POSS core performed through by three reaction steps.…”

Influence of POSS nanoparticles on the microstructure and mechanical properties of carbon fiber reinforced epoxy hybrid composites

“…[16][17][18][19][20][21][22][23] Among them, the POSS nanoparticles are three-dimensional, caged-shaped organosilicon compounds surrounded by functional groups that make them compatible with a polymer matrix. [24][25][26][27][28][29][30][31][32][33] The inclusion of POSS compounds as reinforcing materials into a polymer matrix not only markedly improves the mechanical (e.g., modulus, elasticity, strength, and rigidity) and thermal (e.g., thermal stability and transition temperatures) properties but also reduces the flammability, heat evolution, and viscosity during processing. [25,[31][32][33][34][35][36][37] Thus, they have been commonly used for the formation of functional hybrid composites.…”