Water‐Responsive Shape Memory Polyurethane Block Copolymer Modified with Polyhedral Oligomeric Silsesquioxane

2006 ◽  
Vol 45 (4) ◽  
pp. 453-461 ◽  
Author(s):  
Yong Chae Jung ◽  
Hyang Hwa So ◽  
Jae Whan Cho
RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90212-90219 ◽  
Author(s):  
Pengfei Yang ◽  
Guangming Zhu ◽  
Xuelin Shen ◽  
Xiaogang Yan ◽  
Jing Nie

A POSS–PCL shape memory network is synthesized. The cage-like POSS not only serves as a chemical netpoint, also causes improvement in mechanical properties. Optimized networks exhibit both excellent tensile strength and nearly complete recovery.


2020 ◽  
Vol 11 (36) ◽  
pp. 5819-5832
Author(s):  
Bingjie Zhao ◽  
Honggang Mei ◽  
Sixun Zheng

Organic–inorganic polyethylene (PE) telechelics with polyhedral oligomeric silsesquioxane termini were synthesized via the combination of acyclic diene metathesis, ring-opening metathesis polymerization and hydrogenation reactions.


2010 ◽  
Vol 123-125 ◽  
pp. 169-172
Author(s):  
Steven Spoljaric ◽  
Robert A. Shanks

Dye-coupled polyhedral oligomeric silsesquioxane (POSS) were prepared and the coloured POSS particles were ultrasonically solution dispersed in poly(styrene-b-butadiene-b-styrene) (SBS). POSS molecules contained either isobutyl or phenyl groups to provide selective compatibility with either the soft (butadiene) or hard (styrene) phase within the block copolymer. The composition and thermal stability were characterised using thermogravimetry. Colour coordinates were measured. Tensile mechanical properties, creep and recovery were determined. Creep was modeled using the 4-element model of Maxwell and Kelvin-Voigt, while recovery correlated with the stretched-exponential function of Kohlrausch, Williams and Watts.


Polymer Korea ◽  
2019 ◽  
Vol 43 (1) ◽  
pp. 106-112
Author(s):  
Haneum Park ◽  
Jiwon Lee ◽  
Jeongwan Chae ◽  
Jeong-Seon Sang ◽  
Kyung Wha Oh ◽  
...  

2011 ◽  
Vol 44 (17) ◽  
pp. 6793-6799 ◽  
Author(s):  
Vikram K. Daga ◽  
Eric R. Anderson ◽  
Samuel P. Gido ◽  
James J. Watkins

Author(s):  
Vivaan Patel ◽  
Jacqueline Maslyn ◽  
Saheli Chakraborty ◽  
Gurmukh K Sethi ◽  
Irune Villalengua ◽  
...  

Abstract We have studied the cycle life of two polyhedral oligomeric silsesquioxane-b-poly(ethylene oxide)-b-polyhedral oligomeric silsesquioxane (POSS-PEO-POSS) block copolymer electrolytes differing primarily in molecular weights and composition using lithium/polymer/lithium symmetric cells. The higher molecular weight electrolyte, labeled H, has a higher storage modulus, Gel. However, the volume fraction of the conducting phase in the low molecular weight electrolyte, labeled L, is higher and this leads to a four-fold increase in limiting current density, iL. Measurement of ionic conductivity provides insight into the reason for the observed differences in limiting current density. The average lifetime of symmetric cells with electrolyte L was slightly higher than that of cells with electrolyte H. The combined effect of mechanical and electrochemical properties of electrolytes on the stability of lithium electrodeposition was quantified by examining two dimensionless parameters, i/iL and Gel/GLi, introduced in the theory developed by Barai and Srinivasan [Phys. Chem. Chem. Phys., 19, 20493–20505 (2017)]. This theory predicts the regime of stable lithium electrodeposition as a function of these two parameters. Despite large differences in Gel and iL between the two electrolytes, we show that similar cell lifetimes are consistent with the theoretical predictions of unstable lithium electrodeposition without resorting to any adjustable parameters.


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