Characterization of Industrial Polymers and Polymer Mixtures by Turbidimetric Measurements at the Lower Critical Solution Temperature

1986 ◽  
pp. 77-82
Author(s):  
Phi-Thi Tu-Anh ◽  
H. Phuong-Nguyen ◽  
G. Delmas
Keyword(s):  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Polymer Mixtures ◽  
Critical Solution Temperature

Synthesis and Characterization of Comb-Type Grafted Hydrogels

2012 ◽  
Vol 602-604 ◽  
pp. 1274-1284
Author(s):  
Ping Zhang ◽  
Shi Pu Li ◽  
Xin Yu Wang ◽  
Hong Lian Dai
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectroscopy ◽  
Lower Critical Solution Temperature ◽  
Ammonium Persulfate ◽  
Solution Temperature ◽  
Synthesis And Characterization ◽  
Critical Solution Temperature

The grafted hydrogels of N-isopropylacrylamide (IPAAm) with 2-hydroxyethylacrylate (HEA) was prepared in an aqueous solution using ammonium persulfate (APS) and N,N,N’,N’-tetramethylethylene diamine (TEMED) as an accelerator. Lower critical solution temperature (LCST) and swelling ratios were measured as a function of temperature. The properties of the hydrogels contained pyrenyl probe in water were investigated by fluorescence spectroscopy.

Characterization of the molecular weight distribution of polypropylene and polyethylene by turbidity at the lower critical solution temperature

1994 ◽  
Vol 72 (2) ◽  
pp. 390-397 ◽  
Author(s):  
Takouhi Bohossian ◽  
Geneviève Delmas ◽  
Henri Benoît
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Lower Critical Solution Temperature ◽  
Scattered Light ◽  
Solution Temperature ◽  
Atactic Polypropylene ◽  
Critical Solution Temperature ◽  
A New Technique

The characterization in butane of noncrystalline atactic polypropylene (ncPP) (1) with a narrow molecular weight distribution (MWD) is presented. It uses a new technique based on a thermogram, consisting of turbidity peaks developed in a solution at a Lower Critical Solution Temperature (LCST) during a step-by-step temperature increase. Several refinements concerning the analysis of data have been added to the expressions used in earlier work on polyethylene. The relation between the volume of the concentrated phase and the attenuation of light has been developed from an expression of the scattered light by a biphasic system. The thermograms gave a good agreement in Mw and Mw/Mn for four well-characterized ncPP samples. Wide MWD isotactic PP samples (2) were also analyzed in a mixture of butane and 2-methylbutane. Solution behavior at the LCST of 1 and 2 was compared.

A polyelectrolyte-containing copolymer with a gas-switchable lower critical solution temperature-type phase transition

2019 ◽  
Vol 10 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Jin-Jin Li ◽  
Yin-Ning Zhou ◽  
Zheng-Hong Luo ◽  
Shiping Zhu
Keyword(s):  
Phase Transition ◽  
Cloud Point ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A polyelectrolyte-containing copolymer with a CO2/N2-switchable cloud point, resulting from the gas-induced alternation of hydrophilicity, was prepared.

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