scholarly journals Ultrasonic Degradation of Polystyrene for Tailoring Molecular Weight and Polydispersity of Polystyrene Fragments

2020 ◽  
Author(s):  
Jana Zimmermann ◽  
David Kruppa ◽  
Michael Fischlschweiger ◽  
Sabine Beuermann ◽  
Sabine Enders
Keyword(s):  
Molecular Weight ◽  
Ultrasonic Degradation

A high-molecular weight exopolysaccharide from the Cs-HK1 fungus: Ultrasonic degradation, characterization and in vitro fecal fermentation

2020 ◽  
Vol 246 ◽  
pp. 116636
Author(s):  
Yu-Heng Mao ◽  
Ang-Xin Song ◽  
Long-Qing Li ◽  
Yan Yang ◽  
Zhong-Ping Yao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ultrasonic Degradation

Analysis on Influencing Factors of Degradation of Water Treatment with Ultrasonic Wave Based on GPC

2014 ◽  
Vol 484-485 ◽  
pp. 501-506
Author(s):  
Hou Wang Li ◽  
Shu Sha Zhao
Keyword(s):  
Molecular Weight ◽  
Water Treatment ◽  
Ultrasonic Wave ◽  
Influencing Factors ◽  
Pollution Control ◽  
Ultrasonic Frequency ◽  
Long Duration ◽  
Ultrasonic Technology ◽  
Ultrasonic Degradation ◽  
Frequency Power

To promote the application of the ultrasonic technology in pollution control, the introduction and the analysis of development of this technology, the basic theory of ultrasonic degradation and the influencing factors of ultrasonic degradation were studied in this paper. The analysis of molecular weight and distribution of wastewater and the elaboration of the influences of the ultrasonic frequency, power and the duration on the degradation were conducted by GPC. And an objective and reasonable explanation was advanced: in a certain range, proper increase of the ultrasonic frequency, power or duration would enhance its degradation; but excessive increase of the frequency, power or the increase of temperature due to long duration would decrease the degradation.

Ultrasonic degradation of aqueous dextran: Effect of initial molecular weight and concentration

2012 ◽  
Vol 90 (1) ◽  
pp. 447-451 ◽  
Author(s):  
Qingsong Zou ◽  
Yuanyuan Pu ◽  
Zhong Han ◽  
Nan Fu ◽  
Suxia Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ultrasonic Degradation ◽  
Aqueous Dextran

Ultrasonic degradation for molecular weight reduction of pharmaceutical cellulose ethers

2011 ◽  
Vol 83 (2) ◽  
pp. 843-851 ◽  
Author(s):  
D.J. Goodwin ◽  
D.R. Picout ◽  
S.B. Ross-Murphy ◽  
S.J. Holland ◽  
L.G. Martini ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Weight Reduction ◽  
Cellulose Ethers ◽  
Ultrasonic Degradation

scholarly journals Use of ultrasonic degradation to study the molecular weight influence of polymeric admixtures for mortars

2013 ◽  
Vol 47 ◽  
pp. 1046-1052 ◽  
Author(s):  
Thomas Poinot ◽  
Kawtar Benyahia ◽  
Alexandre Govin ◽  
Thomas Jeanmaire ◽  
Philippe Grosseau
Keyword(s):  
Molecular Weight ◽  
Ultrasonic Degradation

Molecular weight kinetics and chain scission models for dextran polymers during ultrasonic degradation

2017 ◽  
Vol 156 ◽  
pp. 71-76 ◽  
Author(s):  
Yuanyuan Pu ◽  
Qingsong Zou ◽  
Dianzhi Hou ◽  
Yiping Zhang ◽  
Shan Chen
Keyword(s):  
Molecular Weight ◽  
Chain Scission ◽  
Ultrasonic Degradation

Ultrasonic Degradation of Dextran in Aqueous Solution

2011 ◽  
Vol 396-398 ◽  
pp. 1624-1627 ◽  
Author(s):  
Qing Song Zou ◽  
Yuan Yuan Pu ◽  
Su Xia Li ◽  
Qing Wang ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Ultrasonic Treatment ◽  
Degradation Rate ◽  
Ultrasonic Power ◽  
Operational Parameters ◽  
Ultrasonic Device ◽  
Initial Stage ◽  
Ultrasonic Degradation

An ultrasonic device with frequency of 20 kHz was used to investigate the effect of different operational parameters such as ultrasonic power, temperature and initial molecular weight on dextran degradation. Results show that the molecular weight of dextran can be controlled by ultrasonic treatment. Higher the ultrasonic power and lower the temperature could increase the degradation rate (R).The initial molecular weight plays an important role in at the initial stage of dextran degradation (within 20 minutes). A smilar limiting molecular weight (Mw≈8.7×104) was obtained after 2 hours ultrasonic treatment for four different initial molecular weight dextrans, suggesting that the limiting molecular weight is independent on the initial molecular weight of dextran. Ultrasonic treatment can be used as a safe, simple and effective method to control the molecular weight of dextran.

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