Regular Network Pattern Evolution Observed in Phase Separation in Low-Molecular-Weight LC and LC Block Copolymer Mixture

2009 ◽  
Vol 42 (15) ◽  
pp. 5442-5445 ◽  
Author(s):  
Osamu Sato ◽  
Yusuke Inagaki ◽  
Sungmin Kang ◽  
Masatoshi Tokita ◽  
Junji Watanabe
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Block Copolymer ◽  
Low Molecular Weight ◽  
Regular Network ◽  
Network Pattern

Multiscale Dewetting of Low-Molecular-Weight Block Copolymer Ultrathin Films

2002 ◽  
Vol 23 (3) ◽  
pp. 205-209 ◽  
Author(s):  
Donovan N. Leonard ◽  
Phillip E. Russell ◽  
Steven D. Smith ◽  
Richard J. Spontak
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Ultrathin Films ◽  
Low Molecular Weight

scholarly journals Phase separation effects and the nematic–isotropic transition in polymer and low molecular weight liquid crystals doped with nanoparticles

Soft Matter ◽  
2013 ◽  
Vol 9 (13) ◽  
pp. 3578 ◽  
Author(s):  
Maxim V. Gorkunov ◽  
Georgiy A. Shandryuk ◽  
Alina M. Shatalova ◽  
Irina Yu. Kutergina ◽  
Alexey S. Merekalov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Liquid Crystals ◽  
Low Molecular Weight

Nematic–nematic phase separation from uniform nematic domain in polymer LC and low-molecular-weight LC mixture showing network lattice formation in pinning stage

Soft Matter ◽  
2011 ◽  
Vol 7 (15) ◽  
pp. 6998 ◽  
Author(s):  
Takayuki Sugiyama ◽  
Osamu Sato ◽  
Sungmin Kang ◽  
Masatoshi Tokita ◽  
Junji Watanabe
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Nematic Phase ◽  
Low Molecular Weight ◽  
Lattice Formation

Macroporous Thermosets via Chemically Induced Phase Separation

1996 ◽  
Vol 431 ◽  
Author(s):  
J. Kiefer ◽  
R. Porouchani ◽  
D. Mendels ◽  
J. B. Ferrer ◽  
C. Fond ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
New Technology ◽  
Curing Temperature ◽  
Low Molecular Weight ◽  
Closed Cell ◽  
Chemically Induced

AbstractWe have explored a new technology based on chemically induced phase separation that yields porous epoxies and cyanurates with a closed cell morphology and micrometer sized pores with a narrow pore size distribution. When the precursor monomers are cured in the presence of a low molecular weight liquid, the desired morphology results from a phase separation and a chemical quench. After phase separation, the porosity is achieved by thermal removal of the secondary liquid phase, specifically by diffusion through the crosslinked matrix. In respect to the thermodynamics and kinetics, the origin of the phase separation process can be identified as nucleation and growth. The influence of internal and external reaction parameters, such as chemical nature of the low molecular weight liquid, its concentration and the curing temperature on the final morphology are presented. Thus, the morphology can be controlled ranging from a monomodal to bimodal pore size distribution with pore sizes inbetween 1 to 10 μm. These porous thermosets are characterized by a significantly lower density, without any loss in thermal stability compared to the neat matrix. Such new materials demonstrate great interest for lowering the dielectric constant and for improving the fundamental understanding of the role of voids in stress relaxation and toughening.

Topological coarsening of low-molecular-weight block copolymer ultrathin films by environmental AFM

Polymer ◽  
2002 ◽  
Vol 43 (25) ◽  
pp. 6719-6726 ◽  
Author(s):  
Donovan N Leonard ◽  
Richard J Spontak ◽  
Steven D Smith ◽  
Phillip E Russell
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Ultrathin Films ◽  
Low Molecular Weight

Phase Behavior of Triblock Copolymers upon Incorporation of Non-Parent, Midblock-Associating Additives

1996 ◽  
Vol 461 ◽  
Author(s):  
J. H. Laurer ◽  
J. F. Mulling ◽  
R. Bukovnik ◽  
R. J. Spontak
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Phase Behavior ◽  
Triblock Copolymer ◽  
Triblock Copolymers ◽  
Thermoplastic Elastomer ◽  
Low Molecular Weight ◽  
Repulsive Interactions

ABSTRACTAddition of a block-selective homopolymer to a microphase-ordered block copolymer is known to result in preferential swelling of the chemically compatible microdomain. In this work, we examine the miscibility between a triblock copolymer and a relatively low-molecular-weight, chemically dissimilar, midblock-associating homopolymer and demonstrate that the homopolymer molecules residing in the swollen midblock matrix self-assemble to avoid repulsive interactions with neighboring microdomains. We extend this investigation to include systems composed of a very low-molecular-weight, midblock-associating additive (an oil). At high oil concentrations, the glassy copolymer endblocks micellize, resulting in the formation of a thermoplastic elastomer gel.

Ionic Conductivity of Low Molecular Weight Block Copolymer Electrolytes

2013 ◽  
Vol 46 (3) ◽  
pp. 914-921 ◽  
Author(s):  
Rodger Yuan ◽  
Alexander A. Teran ◽  
Inna Gurevitch ◽  
Scott A. Mullin ◽  
Nisita S. Wanakule ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymer ◽  
Ionic Conductivity ◽  
Low Molecular Weight ◽  
Block Copolymer Electrolytes

scholarly journals Hyperbranched Silicone MDTQ Tack Promoters

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4133 ◽  
Author(s):  
Sijia Zheng ◽  
Shuai Liang ◽  
Yang Chen ◽  
Michael A. Brook
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Complex Mixtures ◽  
Low Molecular Weight ◽  
Structure Property ◽  
Chain Entanglement ◽  
Silicone Gel ◽  
Structure Property Relationships ◽  
Branch Density

Low molecular weight, highly crosslinked silicone resins are widely used as reinforcing agents for highly transparent elastomers and adhesion/tack promoters in gels. The resins are complex mixtures and their structure / property relationships are ill defined. We report the synthesis of a library of 2, 3 and 4-fold hyperbranched polymeric oils that are comprised of linear, lightly branched or highly branched dendronic structures. Rheological examination of the fluids and tack measurements of gels filled with 10, 25 or 50% dendronic oils were made. Viscosity of the hyperbranched oils themselves was related to molecular weight, but more significantly to branch density. The properties are driven by chain entanglement. When cured into a silicone gel, less densely branched materials were more effective in improving tack than either linear oils or Me3SiO-rich, very highly branched oils of comparable molecular weight, because the latter oils underwent phase separation.

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