scholarly journals Sub-zero temperature mechanically stable low molecular weight hydrogels

2018 ◽  
Vol 6 (44) ◽  
pp. 7274-7279 ◽  
Author(s):  
Alice E. R. Fayter ◽  
Matthew I. Gibson ◽  
Emily R. Draper
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Low Molecular Weight ◽  
Zero Temperature

We show here a low molecular weight hydrogelator based on a functionalised dipeptide which is stable down to temperatures of −12 °C despite being made from >99% water. With the addition of glycerol this can be lowered further to −40 °C. At these colder temperatures there is no effect on the mechanical properties of the gels.

Tuneable mechanical properties in low molecular weight gels

Soft Matter ◽  
2011 ◽  
Vol 7 (20) ◽  
pp. 9721 ◽  
Author(s):  
Lin Chen ◽  
Jaclyn Raeburn ◽  
Sam Sutton ◽  
David G. Spiller ◽  
James Williams ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Low Molecular Weight

Research on Chemical Modification of Wood of Fast-Growing Poplar

2013 ◽  
Vol 749 ◽  
pp. 461-465
Author(s):  
De Jun Shen ◽  
Chang Hai Yu ◽  
Zhen Xing
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Structural Material ◽  
Chemical Modification ◽  
Orthogonal Test ◽  
Low Molecular Weight ◽  
Wood Structure ◽  
Optimum Conditions ◽  
Fast Growing ◽  
Performance Requirements

This topic is considered to modify the fast-growing Poplar to improve the properties, in order to fully meet the performance requirements for the structural material. This study aims to improve the dimensional stability and some other mechanical properties through impregnated with the low-molecular-weight PF resin. Through design orthogonal test in different mole ratio of Formaldehyde and Phenol, different amount of NaOH and PVA, we make PF resin to impregnate Poplar and pressing into laminated timber to measure bonding strength, MOR, MOE. The study indicated that: the optimum conditions of the low molecular weight PF resin for modify Poplar are: mole ratio of Formaldehyde and Phenol is 2.4, mole ratio of NaOH and phenol is 0.05, amount of PVA is 3% of the phenol. Under this condition Poplar specimen got the biggest increase in various properties and it can satisfy the requirements of the outdoor wood structure.

Improved mechanical properties of polyacrylamide hydrogels created in the presence of low-molecular-weight hydrogelators

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 90010-90013 ◽  
Author(s):  
Yutaka Ohsedo ◽  
Makiko Taniguchi ◽  
Kowichiro Saruhashi ◽  
Hisayuki Watanabe
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Low Molecular Weight ◽  
Polyacrylamide Hydrogels

It was found that the crushing stress of the obtained polyacrylamide hydrogels was enhanced by using the molecular gel as removable templates.

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