Synthesis of ordered, functional, robust nanoporous membranes from liquid crystalline brush-like triblock copolymers

Abstract

The fabrication of mechanically robust nanoporous polymeric membrane materials with aligned, accessible functionalized nanopores is extremely important for many applications.

Block Copolymer Membranes

“…[55][56][57][58][59] The etching has been recently applied to membranes prepared from copolymers with robust norbornene blocks bearing amines and side chains of polylactide and liquid crystal forming blocks. [60] Particularly interesting approaches were proposed, combining a polymerization-induced phase separation and in situ block copolymer formation, as well as crosslinking strategies, followed by selective etching of segments to form pores. [59,61,62] The combination of block copolymer self-assembly, interfacial polymerization and selective etching is also a promising approach.…”

Grubbs’ and Schrock’s Catalysts, Ring Opening Metathesis Polymerization and Molecular Brushes—Synthesis, Characterization, Properties and Applications

“…There are four commercial products available: (a) l -lactide, LLA, (CAS: 4511-42-6), (b) d -lactide, DLA, (CAS: 13076-17-0), (c) the racemic mixture of d - and l -lactide, DLLA, (CAS: 95-96-5) and meso -lactide (CAS: 13076-19-2). The majority of the studies on lactide bottlebrushes involve PDLLA side chains (23 articles) [ 36 , 49 , 58 , 99 , 111 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 ]. There are only 10 articles with PLLA side chains [ 12 , 34 , 44 , 50 , 56 , 57 , 104 , 108 , 116 , 145 , 146 , 147 , 148 ] and one article where PDLA (and PLLA) side chains are used [ 145 ].…”

Quick and Efficient Thermal Stability Enhancement of Micro‐Phase Separated Structure Formed from ABA Triblock Copolymers by Photo Cross‐Linking Approach

“…The segregation power is determined by the product of degree of polymerization ( N ) and the Flory‐Huggins interaction parameter ( χ ) between the components, and the morphological diagrams dependent on molecular factors, such as N, the block composition, χ , and etc, have been developed both experimentally and theoretically . Based on the tremendous past knowledge, block copolymer‐based structures have been used, or are expected, for applications to various nano‐materials, e. g., patterned substrates, and optical functional materials …”

“…[4][5][6] The segregation power is determined by the product of degree of polymerization (N) and the Flory-Huggins interaction parameter (χ) between the components, and the morphological diagrams dependent on molecular factors, such as N, the block composition, χ, and etc, have been developed both experimentally and theoretically. [7][8][9] Based on the tremendous past knowledge, block copolymer-based structures have been used, or are expected, for applications to various nano-materials, e. g., patterned substrates, [10][11][12] and optical functional materials. [13][14][15] Such micro-phase separated structures composed of block copolymers become disordered gradually with an increase in temperatures, which is related to the dependency of χ on the temperature; χ is roughly expressed χ = A + B/T, where A and B is regarded as enthalpic term and entropic term, respectively.…”