scholarly journals Tuning thermal properties and microphase separation in aliphatic polyester ABA copolymers

2015 ◽  
Vol 6 (9) ◽  
pp. 1445-1453 ◽  
Author(s):  
J. P. MacDonald ◽  
M. P. Parker ◽  
B. W. Greenland ◽  
D. Hermida-Merino ◽  
I. W. Hamley ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Block Copolymers ◽  
Ring Opening ◽  
Microphase Separation ◽  
Aliphatic Polyester

Four alkyl substituted β-lactones were investigated in ring opening polymerisation to produce a family of poly(3-hydroxyalkanoate)s and their block copolymers.

scholarly journals The crystallinity, thermal properties and microscopic morphology of di-block copolymers of l-lactide and several acrylates

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 31934-31946 ◽  
Author(s):  
Wei-Wei Wang ◽  
Long Jiang ◽  
Wu-Yang Ren ◽  
Chun-Mei Zhang ◽  
Chang-Zhen Man ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Block Copolymers ◽  
Microphase Separation ◽  
Microscopic Morphology

Di-block copolymers of l-lactide and (meth)acrylate were synthesized from PLLA macroinitiators, and the microphase separation of copolymers was observed.

Phase Separation in Thermosetting Blends of Epoxy Resin with PS-b-PCL and PI-Si Block Copolymers

2014 ◽  
Vol 936 ◽  
pp. 95-98
Author(s):  
Jin Dian Ding ◽  
Wei Zhen Li ◽  
Tian Qi Jiang ◽  
Zong Lian Xia ◽  
Wen Jun Gan
Keyword(s):  
Phase Separation ◽  
Block Copolymers ◽  
Diblock Copolymer ◽  
Ring Opening ◽  
Microphase Separation ◽  
Ring Opening Polymerization ◽  
Lithium Aluminum ◽  
Ps I ◽  
Atomic Transfer Radical Polymerization ◽  
Copolymer Poly

Amphiphilic Diblock Copolymer Poly(styrene-b-ε-Caprolactone) were Synthesized. Firstly, Polystyrene was Synthesized via Sequential Atomic Transfer Radical Polymerization (ATRP), and then the Tetra Hydro Lithium Aluminum (LiAlH4) was Used as a Reducing Agent in Tetra Hydro (THF) to Reduce Polystyrene to the Pre-Polymer Monohydroxy-Terminated Polystyrene (PS-OH). as Following, Amphiphilic Diblock were Obtained by Ring Opening Polymerization. and the Structure of Diblock Polymer was Investigated by FTIR. Furthermore, the Block Copolymers were Added into the Mixture of Epoxy and me-THPA. and the Optical Microscopy(OM) Shows that the Microphase Separation Occured in this System and the PS-b-PCL can Promote the Phase Separation in the System.

scholarly journals Precise Synthesis and Thin Film Self-Assembly of PLLA-b-PS Bottlebrush Block Copolymers

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1412
Author(s):  
Eunkyung Ji ◽  
Cian Cummins ◽  
Guillaume Fleury
Keyword(s):  
Thin Film ◽  
Block Copolymers ◽  
Self Assembly ◽  
Ring Opening ◽  
Periodic Structures ◽  
One Pot ◽  
Ordered Structures ◽  
Carbonyl Chloride ◽  
Thin Film Patterning ◽  
Nanoporous Templates

The ability of bottlebrush block copolymers (BBCPs) to self-assemble into ordered large periodic structures could greatly expand the scope of photonic and membrane technologies. In this paper, we describe a two-step synthesis of poly(l-lactide)-b-polystyrene (PLLA-b-PS) BBCPs and their rapid thin-film self-assembly. PLLA chains were grown from exo-5-norbornene-2-methanol via ring-opening polymerization (ROP) of l-lactide to produce norbornene-terminated PLLA. Norbonene-terminated PS was prepared using anionic polymerization followed by a termination reaction with exo-5-norbornene-2-carbonyl chloride. PLLA-b-PS BBCPs were prepared from these two norbornenyl macromonomers by a one-pot sequential ring opening metathesis polymerization (ROMP). PLLA-b-PS BBCPs thin-films exhibited cylindrical and lamellar morphologies depending on the relative block volume fractions, with domain sizes of 46–58 nm and periodicities of 70–102 nm. Additionally, nanoporous templates were produced by the selective etching of PLLA blocks from ordered structures. The findings described in this work provide further insight into the controlled synthesis of BBCPs leading to various possible morphologies for applications requiring large periodicities. Moreover, the rapid thin film patterning strategy demonstrated (>5 min) highlights the advantages of using PLLA-b-PS BBCP materials beyond their linear BCP analogues in terms of both dimensions achievable and reduced processing time.

Redox-active polymer-nanoparticle hybrid materials

2000 ◽  
Vol 72 (1-2) ◽  
pp. 67-72 ◽  
Author(s):  
Keith J. Watson ◽  
Jin Zhu ◽  
SonBinh T. Nguyen ◽  
Chad A. Mirkin
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Hybrid Materials ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Polymer Chains ◽  
Electrochemical Studies ◽  
Redox Active ◽  
Gel Permeation ◽  
Current Rectification

Ring-opening metathesis polymerization was used to modify organic soluble gold nanoparticles with redox-active polymers. A gel-permeation chromatography study revealed that each nanoparticle is modified with approximately 11 polymer chains. Electrochemical studies of nanoparticles modified with block copolymers of two different redox-active groups revealed that each monomer is electrochemically accessible, while no current rectification was observed.

Effect of Block Molecular Weight on the Mechanical Properties of PA1010-b-PEG Segmented Block Copolymers

2012 ◽  
Vol 512-515 ◽  
pp. 2127-2130
Author(s):  
Li Huo ◽  
Cai Xia Dong
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Block Copolymers ◽  
Microphase Separation ◽  
Soft Segment ◽  
Mechanical Measurements ◽  
Wide Range ◽  
Hard Block ◽  
Higher Temperature ◽  
Hard Segments

The mechanical properties were investigated of a series of PA-PEG thermalplastic elastomer based on PA1010 and polytetramethylene glycol (PEG) with varying hard and soft segment content. Dynamic mechanical measurements of these polymers have carried out over a wide range of temperatures. The block copolymers exhibit three peaks, designated as α, β and γ in the tanδ-temperature curve. The α transition shifts to higher temperature with increasing hard block molecular weight. However, at a constant hard molecular weight, the α transition shifts to higher temperature and the damping increases on increasing the soft segment molecular weight. DMA results show that the block copolymers exhibit a microphase separation structure and both soft and hard segments were found to be crystallizable. The degree of phase separation increases with increasing hard block molecular weight.

Phase behaviors of side chain liquid crystalline block copolymers

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1514-1521 ◽  
Author(s):  
Xiaokang Li ◽  
Feng Huang ◽  
Tao Jiang ◽  
Xiaohua He ◽  
Shaoliang Lin ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Liquid Crystalline ◽  
Microphase Separation ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Side Chain ◽  
Phase Behaviors

The microphase separation of side chain liquid crystalline (SCLC) block copolymers was studied using dissipative particle dynamics (DPD) simulations.

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