Composite Solid Polymer Electrolytes Based on Pluronics: Does Ordering Matter?

Abstract

Composite solids polymer electrolytes (SPEs) based on Pluronic block copolymers, PEO x -b-PPO y -b-PEO x , and silicate organic-inorganic component (OIC) formed in situ have been synthesized and characterized using solid-state NMR, Raman spectroscopy, differential scanning calorimetry (DSC), smallangle X-ray scattering (SAXS), rheology, and electrochemical measurements. Raman spectroscopy, DSC, and rheological data reveal that the block copolymer and OIC are intermixed in the composite SPEs, and the degree of intermixing determines the SPE properties. Comparison of the SAXS and electrochemical results leads us to conclude that ordering in block copolymer-based composite SPEs is not a crucial parameter for the improved conductivity, while the combination of the ratios of the SPE components and their intermixing gives rise to extended interfaces that control the electrochemical performance.

Hybrid and biohybrid silicate based materials: molecular vs. block-assembling bottom–up processes

“…146,147 The systems based on PEO-block copolymers, silica precursors and Li-salts give hybrids exhibiting enhanced conductivity (up to 5 Â 10 À5 S cm À1 ) with improved mechanical properties when compared to equivalent pure PEO-Li salts polymer electrolytes. 148 The use of the sol-gel approach to prepare silica matrices in the presence of polyethers (e.g. poly(oxypropylene) glycol, poly(oxytetramethylene) glycol) was proposed by Kohjiya and co-workers in 1990 149 and applied for developing organic-inorganic hybrids for optical applications.…”

“…148 The use of the sol-gel approach to prepare silica matrices in the presence of polyethers (e.g. poly(oxypropylene) glycol, poly(oxytetramethylene) glycol) was proposed by Kohjiya and co-workers in 1990 149 and applied for developing organic-inorganic hybrids for optical applications.…”

Hexagonal patterns in thin films: Experiments and modeling

“…3a) suggests that the damage is due to plastic deformation. This behavior is associated with the high content of polymer (plasticizer) which endows an elastic-perfectly plastic constitutive relation [20], i.e. the material undergoes elastic deformation up to a fixed yield stress,  y , followed by perfectly plastic deformation.…”

“…The effective elastic modulus of the hardened, dried layer in our composite film is estimated to be 1MPa and its tensile strength to be 100 kPa. [20] The elastic modulus of a glass substrate is ~70 GPa resulting in k~70 . 10 3 .…”

Preparation of stimuli-responsive hydrogel networks with threaded β-cyclodextrin end-capped chains via combination of controlled radical polymerization and click chemistry

“…is 101.6 J g À1 . 50 The enthalpy of fusion of the primary PEG-b-PPG-b-PEG network prepared from thiol-ene click reaction decreases to 21.6 J g À1 , which is still higher than that of 15.3 J g À1 for the sliding-ring PEG-b-PPG-b-PEG-thread-bCD network, and that of 2.6 J g À1 for the sliding-ring PEG-b-PPG-b-PEG-thread-bCD-capped-PMES 53 network. The higher the molar mass of threaded bCD-capped-PMES polymer in the network, the greater the extent of decrease in DH f , consistent with the progressive increase in size and density of the PMES domains.…”