scholarly journals Poly[n]catenanes: Synthesis of molecular interlocked chains

Science ◽  
2017 ◽  
Vol 358 (6369) ◽  
pp. 1434-1439 ◽  
Author(s):  
Qiong Wu ◽  
Phillip M. Rauscher ◽  
Xiaolong Lang ◽  
Rudy J. Wojtecki ◽  
Juan J. de Pablo ◽  
...  
Keyword(s):  
Hydrodynamic Radius ◽  
Molar Mass ◽  
Soft Materials ◽  
High Yield ◽  
Synthetic Approach ◽  
Interlocked Molecules ◽  
High Molar Mass ◽  
Product Number ◽  
Linear Poly

As the macromolecular version of mechanically interlocked molecules, mechanically interlocked polymers are promising candidates for the creation of sophisticated molecular machines and smart soft materials. Poly[n]catenanes, where the molecular chains consist solely of interlocked macrocycles, contain one of the highest concentrations of topological bonds. We report, herein, a synthetic approach toward this distinctive polymer architecture in high yield (~75%) via efficient ring closing of rationally designed metallosupramolecular polymers. Light-scattering, mass spectrometric, and nuclear magnetic resonance characterization of fractionated samples support assignment of the high–molar mass product (number-average molar mass ~21.4 kilograms per mole) to a mixture of linear poly[7–26]catenanes, branched poly[13–130]catenanes, and cyclic poly[4–7]catenanes. Increased hydrodynamic radius (in solution) and glass transition temperature (in bulk materials) were observed upon metallation with Zn2+.

Characterization of ultra-high molar mass hyaluronan: 1. Off-line static methods

Polymer ◽  
1998 ◽  
Vol 39 (25) ◽  
pp. 6611-6620 ◽  
Author(s):  
Raniero Mendichi ◽  
Alberto Giacometti Schieroni ◽  
Cesare Grassi ◽  
Alberto Re
Keyword(s):  
Molar Mass ◽  
High Molar Mass

scholarly journals Gums—Characteristics and Applications in the Food Industry

2020 ◽  
Author(s):  
Diego Aires da Silva ◽  
Giselle Cristine Melo Aires ◽  
Rosinelson da Silva Pena
Keyword(s):  
Galacturonic Acid ◽  
Food Industry ◽  
Molar Mass ◽  
Thermodynamic Characteristics ◽  
Food Products ◽  
Moisture Retention ◽  
High Molar Mass ◽  
Chemical Structures ◽  
Complex Carbohydrates

Gums, or polysaccharides, are complex carbohydrates, soluble in water, which can form gels and mucilages. They have high molar mass and can be formed by galactose, arabinose, rhamnose, xylose, galacturonic acid, among others. They have gelling characteristics, thickening, moisture retention, emulsification and stabilization. Polysaccharides are widely used in the formulation of food products, due to their wide versatility. Its diversity of applications is closely linked to its chemical structures. The characterization of structural molecules allows the knowledge of the properties of polysaccharides or glycoconjugates. In this sense, this chapter addresses knowledge about chemical, molecular, rheological, thermodynamic characteristics that are extremely important to identify the use and applications of polysaccharides in the context of elaboration and innovation in the food industry.

Synthesis and characterization of high-molar-mass star-shaped poly(l-lactide)s

Polimery ◽  
2018 ◽  
Vol 63 (7/8) ◽  
pp. 488-494 ◽  
Author(s):  
Adam Michalski ◽  
Grzegorz Lapienis
Keyword(s):  
Molar Mass ◽  
Synthesis And Characterization ◽  
Mass Star ◽  
High Molar Mass

Thermally stable optically transparent copolymers of 2-methylene-1,3-dioxepane and N-phenyl maleimide with degradable ester linkages

e-Polymers ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 217-226 ◽  
Author(s):  
Yinfeng Shi ◽  
Seema Agarwal
Keyword(s):  
Ring Opening ◽  
Molar Mass ◽  
Charge Transfer Complex ◽  
Resonance Spectroscopy ◽  
Mechanistic Studies ◽  
Scanning Calorimetry ◽  
Reaction Conditions ◽  
Radical Ring ◽  
High Molar Mass

AbstractThe copolymers of 2-methylene-1,3-dioxepane (MDO) and N-phenyl maleimide (NPM) prepared by radical polymerization with high thermal stability, glass transition temperature and optical transparency are presented. The polymers made under specific reaction conditions, i.e., 120°C and high amounts of MDO, had degradable ester units, which were formed via radical ring-opening polymerization of MDO. The formation of charge-transfer complex between MDO and NPM also led to the formation of high-molar-mass copolymers by simple mixing and heating of monomers without the use of any initiator. Structural characterization of the copolymers including mechanistic studies was carried out using nuclear magnetic resonance spectroscopy, and their thermal properties were studied using differential scanning calorimetry and thermogravimetric analysis.

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