Liquid Crystalline Polyurethane Elastomers Containing Mesogenic Azobenzene Pendant Groups for Photomechanical Actuators

2012 ◽  
Vol 531 ◽  
pp. 580-583
Author(s):  
Lin Juan Yu ◽  
Ren Gui Peng ◽  
Yuan Zhen Wang ◽  
Yue E Liu ◽  
Ying Kui Yang
Keyword(s):  
Liquid Crystalline ◽  
Uv Light ◽  
Mechanical Analysis ◽  
Poly Ethylene Glycol ◽  
Polyurethane Elastomers ◽  
Uv Light Irradiation ◽  
Potential Applications ◽  
Linear Poly ◽  
Thermal Polycondensation ◽  
Poly Ethylene

A liquid crystalline polyurethane elastomer (LCPUE) film has been successfully fabricated by thermal polycondensation of azobenzene mesogenic monomer containing bishydroxyl groups with tolylene 2,4-diisocyanate, linear poly(ethylene glycol) and star pentaerythritol ethoxylate as a cross-linker. The thermotropic film of LCPUE was found to show reversible photoisomerism behavior and could be bent towards the direction of UV-light irradiation. The mechanical force generated in the LCPUE film upon photoirradiation was calculated to be 260–285 kPa according to the dynamic mechanical analysis. Thus this material may promise potential applications in remote light-controlled actuators.

Synthesis and Photocatalytic Activity of Rod-Shaped Mesoporous TiO2 Using Poly (ethylene glycol) as Templates

2013 ◽  
Vol 634-638 ◽  
pp. 2272-2275
Author(s):  
Chang Wang Shao ◽  
Guo Wei Zhou ◽  
De Lan Xu ◽  
Bin Sun
Keyword(s):  
Photocatalytic Activity ◽  
Ethylene Glycol ◽  
Uv Light ◽  
Light Irradiation ◽  
Homogeneous Precipitation ◽  
Poly Ethylene Glycol ◽  
Structure Directing Agent ◽  
Uv Light Irradiation ◽  
Poly Ethylene ◽  
Xrd Patterns

Rod-shaped TiO2 was synthesized via homogeneous precipitation by using PEG and urea as the structure directing agent and precipitation agent, respectively. The prepared samples were characterized by XRD, TEM, and FESEM. The XRD patterns of the samples indicated that the crystalline phase was anatase. TEM and FESEM images revealed the morphology of prepared TiO2 samples were rod-shaped, and densely packed with plenty of spherical-shaped units. RTS3 exhibited the highest photocatalytic activity for degradation of papermaking wastewater under UV light irradiation. CODCr percent degradation was about 75% under UV light irradiation in 12 h for RTS3.

scholarly journals Bottlebrush-architectured poly(ethylene glycol) as an efficient vector for RNA interference in vivo

2019 ◽  
Vol 5 (2) ◽  
pp. eaav9322 ◽  
Author(s):  
Dali Wang ◽  
Jiaqi Lin ◽  
Fei Jia ◽  
Xuyu Tan ◽  
Yuyan Wang ◽  
...  
Keyword(s):  
Rna Interference ◽  
Ethylene Glycol ◽  
Target Genes ◽  
Area Under The Curve ◽  
Fold Increase ◽  
Small Interfering Rnas ◽  
Poly Ethylene Glycol ◽  
Linear Poly ◽  
Poly Ethylene

Nonhepatic delivery of small interfering RNAs (siRNAs) remains a challenge for development of RNA interference–based therapeutics. We report a noncationic vector wherein linear poly(ethylene glycol) (PEG), a polymer generally considered as inert and safe biologically but ineffective as a vector, is transformed into a bottlebrush architecture. This topology provides covalently embedded siRNA with augmented nuclease stability and cellular uptake. Consisting almost entirely of PEG and siRNA, the conjugates exhibit a ~25-fold increase in blood elimination half-life and a ~19-fold increase in the area under the curve compared with unmodified siRNA. The improved pharmacokinetics results in greater tumor uptake and diminished liver capture. Despite the structural simplicity these conjugates efficiently knock down target genes in vivo without apparent toxic and immunogenic reactions. Given the benign biological nature of PEG and its widespread precedence in biopharmaceuticals, we anticipate the brush polymer–based technology to have a significant impact on siRNA therapeutics.

Enzymatically crosslinked hydrogels based on linear poly(ethylene glycol) polymer: performance and mechanism

2017 ◽  
Vol 8 (45) ◽  
pp. 7017-7024 ◽  
Author(s):  
Kaixuan Ren ◽  
Bin Li ◽  
Qinghua Xu ◽  
Chunsheng Xiao ◽  
Chaoliang He ◽  
...  
Keyword(s):  
Horseradish Peroxidase ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Linear Poly ◽  
Poly Ethylene ◽  
Performance And Mechanism

A horseradish peroxidase-catalyzed hydrogel based on a double-end tyramine conjugated linear poly(ethylene glycol) polymer is developed and clarified.

Dynamic Mechanical Behaviour of Poly Ethylene Glycol Plasticized Polylacticacid

2012 ◽  
Vol 576 ◽  
pp. 224-227
Author(s):  
M.R. Kaiser ◽  
Hazleen Anuar ◽  
Shamsul Bhari A. Razak
Keyword(s):  
Ethylene Glycol ◽  
Mechanical Analysis ◽  
Partial Replacement ◽  
Potential Candidate ◽  
Poly Ethylene Glycol ◽  
Screw Extruder ◽  
Dynamic Mechanical ◽  
Molecular Weights ◽  
Twin Screw ◽  
Poly Ethylene

Polylacticacid (PLA), produced from annually renewable, natural resources is a potential candidate for the partial replacement of petroleum based polymers and also for its biodegradability. PLA is well known for its better mechanical, thermal property but unfortunately the brittleness and rigidity limit its applicability. For a great number of applications such as packaging, fibers, films, etc., it is of high interest to formulate new PLA grades with improved flexibility and better impact properties. In order to develop PLA-based biodegradable packaging, the physico-mechanical properties of commercially available PLA should be modified using plasticizers. For this, PLA was melt-mixed with poly ethylene glycol (PEG) of 600 molecular weights by twin screw extruder. The thermal properties of plasticized PLA were characterized by utilization of dynamic mechanical analysis. The result shows that with addition of plasticizer glass transition temperature (Tg) is decreased sharply and the storage modulus was also decreased.

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