Role of Molecular Weight Distribution on Charge Transport in Semiconducting Polymers

2014 ◽  
Vol 47 (20) ◽  
pp. 7151-7157 ◽  
Author(s):  
Scott Himmelberger ◽  
Koen Vandewal ◽  
Zhuping Fei ◽  
Martin Heeney ◽  
Alberto Salleo
Keyword(s):  
Molecular Weight ◽  
Charge Transport ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Semiconducting Polymers

Molecular Weight Distribution in Emulsion Polymerization:  Role of Active Chain Compartmentalization

1998 ◽  
Vol 31 (21) ◽  
pp. 7172-7186 ◽  
Author(s):  
Alessandro Ghielmi ◽  
Giuseppe Storti ◽  
Massimo Morbidelli ◽  
W. Harmon Ray
Keyword(s):  
Molecular Weight ◽  
Emulsion Polymerization ◽  
Molecular Weight Distribution ◽  
Weight Distribution

Molecular Weight Dependence of Relaxation Spectra of Amorphous Polymers in the Rubbery Region. VIII. Comparisons of Experimental Relaxation Spectra of Commercial Synthetic Rubbers with those Estimated from Molecular Weight Distributions

1967 ◽  
Vol 40 (2) ◽  
pp. 484-492 ◽  
Author(s):  
Genichi Yasuda
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Mechanical Relaxation ◽  
General Validity ◽  
Relaxation Spectra ◽  
Molecular Weight Distributions ◽  
Synthetic Rubber ◽  
Weight Distributions

Abstract Synthetic rubber of different species, types, and degrees of mastication were used to examine the general validity of the proposed relationship between mechanical relaxation spectra in the rubbery region and molecular weight distribution. Results show that the proposed relationship can be well used to discuss quantitatively the role of molecular weight distribution in the theoretical behavior of a raw rubber while being processed.

Extraction and Partial Purification of Protease from Bilimbi (Averrhoa bilimbi L.)

2013 ◽  
Vol 10 (2) ◽  
pp. 29
Author(s):  
Normah Ismail ◽  
Nur' Ain Mohamad Kharoe
Keyword(s):  
Molecular Weight ◽  
Protein Content ◽  
Ammonium Sulfate ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Protease Activity ◽  
Protein Concentration ◽  
Temperature Stability ◽  
Partial Purification ◽  
Ammonium Sulfate Precipitation

Unripe and ripe bilimbi (Averrhoa bilimbi L.) were ground and the extracted juices were partially purified by ammonium sulfate precipitation at the concentrations of 40 and 60% (w/v). The collected proteases were analysed for pH, temperature stability, storage stability, molecular weight distribution, protein concentration and protein content. Protein content of bilimbi fruit was 0.89 g. Protease activity of both the unripe and ripe fruit were optimum at pH 4 and 40°C when the juice were purified at 40 and 60% ammonium sulfate precipitation. A decreased in protease activity was observed during the seven days of storage at 4°C. Molecular weight distribution indicated that the proteases protein bands fall between IO to 220 kDa. Protein bands were observed at 25, 50 and 160 kDa in both the unripe and ripe bilimbi proteases purified with 40% ammonium sulfate, however, the bands were more intense in those from unripe bilimbi. No protein bands were seen in proteases purified with 60% ammonium sulfate. Protein concentration was higher for proteases extracted with 40% ammonium sulfate at both ripening stages. Thus, purification using 40% ammonium sulfate precipitation could be a successful method to partially purify proteases from bilimbi especially from the unripe stage. 

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