Synthesis and Mesogenic Properties of a Novel Hyperbranched Triphenylene-Based Discotic Liquid Crystal

2010 ◽  
Vol 428-429 ◽  
pp. 62-66
Author(s):  
Chun Xiu Zhang ◽  
Jia Ling Pu ◽  
Zhi Qun He ◽  
Ming Zhang ◽  
Hao Wu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
Weight Distribution ◽  
Synthesis Method ◽  
Optical Microscope ◽  
Terminal Group ◽  
One Pot ◽  
Discotic Liquid Crystal ◽  
End Capping ◽  
Hyperbranched Macromolecule

A novel triphenylene-based hyper-branched macromolecule was synthesized from the functional compound-2, 6, 10-trihydroxy-3, 7, 11–tris (pentyloxy) triphenylene serving as core, using α,ω-dibromodecane as spacer and 1-bromopentane as terminal group for end capping by using a very simple synthesis method, one-pot reaction. The structure of the hyperbranched macromolecule was determined by FTIR and 1HNMR. The molecule weight and the molecular weight distribution were measured by GPC. Mesophase and their structural orders were determined using a polarized optical microscope and a differential scanning calorimeter.

Producing bimodal molecular weight distribution polymers through facile one-pot/one-step RAFT polymerization

2012 ◽  
Vol 50 (19) ◽  
pp. 4103-4109 ◽  
Author(s):  
Hongjuan Jiang ◽  
Lifen Zhang ◽  
Jian Qin ◽  
Wei Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Raft Polymerization ◽  
One Pot ◽  
One Step

scholarly journals Fluorinated triphenylenes and a path to short tailed discotic liquid crystals: synthesis, structure and transport properties

2021 ◽  
Author(s):  
Zhe Li ◽  
Mitchell Powers ◽  
Kayla Ivey ◽  
Sonya Adas ◽  
Brett Ellman ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Transport Properties ◽  
Synthesis Method ◽  
Discotic Liquid Crystals ◽  
Discotic Liquid Crystal

We present a versatile synthesis method capable of creating triphenylene discotic liquids with enhanced control of the number and type of tails. The compounds obtained from this method include a discotic liquid crystal with unusually short methoxy tails.

Preparation and Physicochemical Properties of Concrete Slump-Loss Resistance Agent for Small Slump

2010 ◽  
Vol 168-170 ◽  
pp. 2158-2164
Author(s):  
Guo Rong Duan ◽  
Guo Hong Huang ◽  
Xin Wang ◽  
Ying Gong
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
Molecular Weight Distribution ◽  
Cement Paste ◽  
Weight Distribution ◽  
Synthesis Method ◽  
Retention Performance ◽  
Wide Range ◽  
Loss Resistance ◽  
Gel Permeation

By the application of esterification-polymerization two-step synthesis method, comb-shaped polycarboxylate slump-loss resistance agent XBT for small slump concrete is prepared by controlling ester ratio. The experimental results of concrete and fresh cement paste indicate that XBT has excellent function of plasticity retention in small slump concrete. The experiment of gel permeation liquid chromatogram shows that XBT has wide range of molecular weight distribution, which may be the source of fine plasticity retention performance in the small slump concrete. The combined experiment between ultraviolet and conductivity indicates that there is strong adsorptive action between XBT and Ca2+, and their adsorptive characteristics may be closely related to the plasticity retention properties.

Inverse Design of Molecular Weight Distribution in Controlled Polymerization via a One-Pot Reaction Strategy

2020 ◽  
Vol 53 (15) ◽  
pp. 6409-6419 ◽  
Author(s):  
Hong Liu ◽  
Yao-Hong Xue ◽  
You-Liang Zhu ◽  
Feng-Long Gu ◽  
Zhong-Yuan Lu
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Inverse Design ◽  
Controlled Polymerization ◽  
One Pot

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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