A Novel Network Polymer ⇄ Linear Polymer Reversible System. A New Cross-Linking System Consisting of a Reversible Cross-Linking−Depolymerization of a Polymer Having a Spiro Orthoester Moiety in the Side Chain

1996 ◽  
Vol 29 (13) ◽  
pp. 4819-4819 ◽  
Author(s):  
Takeshi Endo ◽  
Takashi Suzuki ◽  
Fumio Sanda ◽  
Toshikazu Takata
Keyword(s):  
Linear Polymer ◽  
Side Chain ◽  
Cross Linking ◽  
Reversible System ◽  
Network Polymer ◽  
System A

scholarly journals Cellular Orientation on Repeatedly Stretching Gelatin Hydrogels with Supramolecular Cross-Linkers

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2095
Author(s):  
Dae Hoon Lee ◽  
Yoshinori Arisaka ◽  
Asato Tonegawa ◽  
Tae Woong Kang ◽  
Atsushi Tamura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Cellular Response ◽  
Linear Polymer ◽  
Cross Linking ◽  
Adherent Cells ◽  
Cell Cultivation ◽  
Supramolecular Compound ◽  
Synthetic Materials ◽  
Cyclic Molecules

The cytocompatibility of biological and synthetic materials is an important issue for biomaterials. Gelatin hydrogels are used as biomaterials because of their biodegradability. We have previously reported that the mechanical properties of gelatin hydrogels are improved by cross-linking with polyrotaxanes, a supramolecular compound composed of many cyclic molecules threaded with a linear polymer. In this study, the ability of gelatin hydrogels cross-linked by polyrotaxanes (polyrotaxane–gelatin hydrogels) for cell cultivation was investigated. Because the amount of polyrotaxanes used for gelatin fabrication is very small, the chemical composition was barely altered. The structure and wettability of these hydrogels are also the same as those of conventional hydrogels. Fibroblasts adhered on polyrotaxane–gelatin hydrogels and conventional hydrogels without any reduction or apoptosis of adherent cells. From these results, the polyrotaxane–gelatin hydrogels have the potential to improve the mechanical properties of gelatin without affecting cytocompatibility. Interestingly, when cells were cultured on polyrotaxane–gelatin hydrogels after repeated stress deformation, the cells were spontaneously oriented to the stretching direction. This cellular response was not observed on conventional hydrogels. These results suggest that the use of a polyrotaxane cross-linking agent can not only improve the strength of hydrogels but can also contribute to controlling reorientation of the gelatin.

Side-Chain Cholesteric Liquid Crystalline Elastomers Derived from a Mesogenic Cross-Linking Agent

2003 ◽  
Vol 36 (24) ◽  
pp. 9060-9066 ◽  
Author(s):  
Jian-She Hu ◽  
Bao-Yan Zhang ◽  
Ying-Gang Jia ◽  
Song Chen
Keyword(s):  
Liquid Crystalline ◽  
Side Chain ◽  
Cross Linking ◽  
Cholesteric Liquid Crystalline

Anionic Cross-Linking of Polymers Having an Epoxy Group in the Side Chain with Bicyclic and Spirocyclic Bis(γ-lactone)s

1997 ◽  
Vol 30 (9) ◽  
pp. 2532-2538 ◽  
Author(s):  
Keunwo Chung ◽  
Toshikazu Takata ◽  
Takeshi Endo
Keyword(s):  
Epoxy Group ◽  
Side Chain ◽  
Cross Linking

Pulses of Fast Electrons as a Tool To Synthesize Poly(acrylic acid) Nanogels. Intramolecular Cross-Linking of Linear Polymer Chains in Additive-Free Aqueous Solution

2003 ◽  
Vol 36 (7) ◽  
pp. 2484-2492 ◽  
Author(s):  
Slawomir Kadlubowski ◽  
Jaroslaw Grobelny ◽  
Wielislaw Olejniczak ◽  
Michal Cichomski ◽  
Piotr Ulanski
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Polymer Chains ◽  
Linear Polymer ◽  
Cross Linking ◽  
Fast Electrons ◽  
Poly Acrylic Acid

Study on Synthesis and Characterization of Unsaturated Polyester by Enzyme-Catalyzed

2013 ◽  
Vol 575-576 ◽  
pp. 67-70
Author(s):  
Fen Juan Shao ◽  
Qun Yang ◽  
Lan Ying Li ◽  
Da Nian Lu
Keyword(s):  
High Temperature ◽  
Unsaturated Polyester ◽  
Soxhlet Extraction ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Cross Link ◽  
H Nmr ◽  
Ft Ir

Unsaturated polyester was prepared with adipic acid (AA), fumaric acid (FA), itaconic acid (IA) and 1, 6-hexanediol (HD) by enzyme-catalyzed polmerization. The insoluble gel fraction (Qs), as the cross-linking degree of cured unsaturated polyesters which could be self-cross-linked at high temperature through C=C in it, was got by Soxhlet Extraction. The properties were investigated by FT-IR, 1H NMR, DSC, XRD and so on. The results indicated that the C=C in unsaturated diacids reduced the acitvity of N435, which affected the polmerization. With the introduction of C=C of IA or FA, the Mn of polyester reduced. The C=C could self-cross-link under high temperature for lengthy time. The higher the temperature and the longer the time, the Qs increased. As the C=C of IA was in the side chain, it could move easily. Then Qs of poly (AA-co-IA-co-HD) was higher than ploy (AA-co-FA-co-HD). With the increased content of unsaturated diacid, Qs increased. And the biodegradation of cross-linked polyesters became worse.

Cross-Linking Behavior of Diskotic Side-Chain Polymers in Solution

2004 ◽  
Vol 37 (20) ◽  
pp. 7839-7845 ◽  
Author(s):  
Marcel W. C. P. Franse ◽  
Klaas te Nijenhuis ◽  
Jan Groenewold ◽  
Stephen J. Picken
Keyword(s):  
Side Chain ◽  
Cross Linking

Preparation of polyferrocenylsilane via thermal ROP, synthesis of polyferrocenylsilane with methacrylate side chain and its photochemical cross-linking properties

2006 ◽  
Vol 60 (11) ◽  
pp. 1416-1419 ◽  
Author(s):  
Jian-Jun Wang ◽  
Li Wang ◽  
Xue-Jie Wang ◽  
Tao Chen ◽  
Hao-Jie Yu ◽  
...  
Keyword(s):  
Side Chain ◽  
Cross Linking
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