Stimuli-degradable cross-linked polymers synthesized by radical polymerization using a size-complementary [3]rotaxane cross-linker

2013 ◽  
Vol 46 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Keisuke Iijima ◽  
Yasuhiro Kohsaka ◽  
Yasuhito Koyama ◽  
Kazuko Nakazono ◽  
Satoshi Uchida ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Cross Linker

Photodegradable cross-linked polymer derived from a vinylic rotaxane cross-linker possessing aromatic disulfide axle

2013 ◽  
Vol 85 (4) ◽  
pp. 835-842 ◽  
Author(s):  
Yasuhito Koyama ◽  
Takahiro Yoshii ◽  
Yasuhiro Kohsaka ◽  
Toshikazu Takata
Keyword(s):  
Crown Ether ◽  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Vinyl Monomer ◽  
Hydroxymethyl Group ◽  
Cross Links ◽  
Cross Linker ◽  
The Cross ◽  
Vinyl Group ◽  
Site Selective

A new concept for photodegradable cross-linked polymers utilizing characteristics of rotaxane cross-links and aromatic disulfides is proposed. The cross-linked polymer is obtained by the radical polymerization of a vinyl monomer in the presence of a [3]rotaxane-type cross-linker having two radically polymerizable groups. The [3]rotaxane-type cross-linker was prepared in 93 % yield by the typical rotaxane-forming reaction using a dumbbell-shaped aromatic disulfide possessing a bis(ammonium salt) moiety and a crown ether wheel tethered by a hydroxymethyl group (96 %) and the subsequent vinyl group-endowment (80 %). The radical polymerization of methyl methacrylate (MMA) in the presence of the cross-linker (0.1 mol %) at 60 °C afforded solvent-insoluble polymer in 90 % yield. When the polymer was swollen to a gel in dimethylformamide (DMF) and a small part of the gel was UV-irradiated, the gel was promptly solubilized, probably via the photochemical scission of the S–S linkage of the interlocked aromatic disulfide, causing the efficient decomposition of the rotaxane cross-links. The recovered poly(methyl methacrylate) bearing a small amount of crown ether moiety has a molecular weight of Mn 170 kg/mol (Mw/Mn 2.1) that indicated the occurrence of the site-selective photodegradation.

A vinylic rotaxane cross-linker for toughened network polymers from the radical polymerization of vinyl monomers

2017 ◽  
Vol 8 (12) ◽  
pp. 1878-1881 ◽  
Author(s):  
J. Sawada ◽  
D. Aoki ◽  
M. Kuzume ◽  
K. Nakazono ◽  
H. Otsuka ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Vinyl Monomers ◽  
Network Polymers ◽  
Cross Linker ◽  
Vinyl Group

A [2]rotaxane cross-linker with one vinyl group in each component was synthesized as a vinylic cross-linker for highly toughened network polymers.

Amphiphilic polymer conetworks prepared by controlled radical polymerization using a nitroxide cross-linker

2010 ◽  
Vol 48 (19) ◽  
pp. 4141-4149 ◽  
Author(s):  
Weijie Zhao ◽  
Ming Fang ◽  
Junpo He ◽  
Junyu Chen ◽  
Wei Tang ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Amphiphilic Polymer ◽  
Controlled Radical Polymerization ◽  
Cross Linker

Biopolymer monolith for protein purification

2019 ◽  
Vol 219 ◽  
pp. 154-167 ◽  
Author(s):  
Yoshiko Miura ◽  
Hirokazu Seto ◽  
Makoto Shibuya ◽  
Yu Hoshino
Keyword(s):  
Phase Separation ◽  
Protein Purification ◽  
Protein Adsorption ◽  
Radical Polymerization ◽  
Cross Linker ◽  
Polymerization Induced Phase Separation

Porous glycopolymers, “glycomonoliths”, were prepared by radical polymerization based on polymerization-induced phase separation with an acrylamide derivative of α-mannose, acrylamide and cross-linker in order to investigate protein adsorption and separation.

A polyester–polystyrene hybrid connected by dynamic covalent bonds prepared via radical polymerization of styrene in a “RAFT gel”

2014 ◽  
Vol 5 (11) ◽  
pp. 3689-3696 ◽  
Author(s):  
Daiki Yoshimura ◽  
Shinji Yamada ◽  
Akinori Takasu
Keyword(s):  
Radical Polymerization ◽  
Chain Transfer ◽  
Vinyl Monomers ◽  
Covalent Bonds ◽  
Reversible Addition ◽  
Cross Linker

We cross-linked the polyester chains with 1,1-thiocarbonyldiimidazole to form a reversible addition–fragmentation chain-transfer (RAFT) gel, in which the trithiocarbonate moiety acted as a cross-linker. The “RAFT gel” was then swollen in vinyl monomers and styrene was radically polymerized within the gel, in which the polyester and polystyrene segments were miscible at the segment level.

The Mechanical Properties of Inorganic/Organic Co-Crosslinked PDMAEMA Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 38-41
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Jun Hong Yang
Keyword(s):  
Mechanical Properties ◽  
Radical Polymerization ◽  
Compression Strength ◽  
Cross Linker

The nanosized Ov-POSS particles were added into the PDMAEMA hydrogels crosslinked by BIS in situ radical polymerization as a co-crosslinker. Both cross-linker makes a non-ignorable effect on the mechanical properties. With the increase of Ov-POSS, the mechincal properties were improved obviously comparing to the gels only crosslinked by BIS. The increased BIS is also conducive to the enhancement of tensile and compression strength of gels.

scholarly journals Prevention of Oxygen Inhibition of PolyHIPE Radical Polymerization Using a Thiol-Based Cross-Linker

2017 ◽  
Vol 3 (3) ◽  
pp. 409-419 ◽  
Author(s):  
Michael E. Whitely ◽  
Jennifer L. Robinson ◽  
Melissa C. Stuebben ◽  
Hannah A. Pearce ◽  
Madison A.P. McEnery ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Oxygen Inhibition ◽  
Cross Linker
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