The intrinsic viscosity of dilute solutions of stiff polymers

1975 ◽  
Vol 63 (10) ◽  
pp. 4505-4514 ◽  
Author(s):  
U. M. Titulaer ◽  
J. M. Deutch
Keyword(s):  
Intrinsic Viscosity ◽  
Dilute Solutions

Synthesis of star hydrophobically-modified acrylamide copolymers and its some properties in brine

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Ming Duan ◽  
Shenwen Fang ◽  
Liehui Zhang
Keyword(s):  
Shear Rate ◽  
Intrinsic Viscosity ◽  
Apparent Viscosity ◽  
Intramolecular Interaction ◽  
Three Dimensional ◽  
Dilute Solutions ◽  
Hydrophobically Modified ◽  
Star Copolymers ◽  
Huggins Constant ◽  
Acrylamide Copolymers

AbstractStar copolymers of acrylamide (AM) and N,N-dimethyl-Nvinylnonadecan- 1- aminium chloride (C18DMAAC) were synthesized by photopolymerization in water. Some properties of these star hydrophobically modified acrylamide copolymers (SHMPAM) with different C18DMAAC contents and the linear hydrophobically modified acrylamide copolymers (LHMPAM) in brine were characterized. The increase in C18DMAAC content resulted in decreased intrinsic viscosity and increased Huggins constant for SHMPAM. Similar results were observed for LHMPAM. With similar intrinsic viscosity and C18DMAAC content, the Huggins constant of SHMPAM was much higher than that of LHMPAM, which might be due to the fact that SHMPAM had much stronger intramolecular interaction in dilute polymer solutions. In semi-dilute solutions, the apparent viscosity of SHMPAM was increased with increasing C18DMAAC content, which was similar to that of LHMPAM. However SHMPAM exhibited higher apparent viscosity than LHMPAM because it had more arms and thus had more chances to form three-dimensional networks in semi-dilute solutions. In the flowinduced scission experiment, SHMPAM exhibited superior shear stability in comparison with LHMPAM. When the extensional shear rate was ≈ 40000 s-1, the reduction ratios of the apparent viscosities of the four SHMPAMs after the scission were about 80%. In contrast, when the extensional shear rate was ≈20000 s-1, the reduction ratio of the apparent viscosity of LHMPAM-0.40 had already reached around 80%.

Properties of Solutions of Rodlike Chains from Dilute Solutions to the Nematic State

1988 ◽  
Vol 134 ◽  
Author(s):  
Guy C. Berry
Keyword(s):  
Physical Chemistry ◽  
Intrinsic Viscosity ◽  
Rheological Behavior ◽  
Nematic Phase ◽  
Infinite Dilution ◽  
Chain Conformation ◽  
Dilute Solutions ◽  
Concentrated Solutions ◽  
Nematic State ◽  
Rodlike Polymers

ABSTRACTCertain aspects of the physical chemistry of solutions rodlike polymers are reviewed. The range of concentrations includes infinite dilution ([ŋ]c<<l), dilute solutions ([ŋ,]c<l), moderately concentrated solutions (l<[ŋ]c<[ŋ]cNI), and concentrated solutions (c<cN,), where [ŋ] is the intrinsic viscosity and cNI. is the concentration required for a stable nematic phase. Studies of chain conformation are emphasized at infinite dilution, and rheological behavior is emphasized for more concentrated isotropic and nematic solutions. Both theoretical and experimental considerations are included.

Synthesis and solution behaviors of star hydrophobically modified acrylamide copolymers

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Liehui Zhang ◽  
Ming Duan ◽  
Shenwen Fang ◽  
Peng Zhang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Intrinsic Viscosity ◽  
Apparent Viscosity ◽  
Intramolecular Interaction ◽  
Water Solution ◽  
Three Dimensional ◽  
Dilute Solutions ◽  
Hydrophobically Modified ◽  
Huggins Constant ◽  
Acrylamide Copolymers

Abstract Star copolymers of acrylamide and N,N-dimethyl-N-vinyl­nonadecan-1-aminium chloride (C18DMAAC) were synthesized by photopolymerization in water. Solution behaviors of these star hydrophobically modified acrylamide copolymers (SHMPAMs) with different C18DMAAC contents and the linear hydrophobically modified acrylamide copolymers (LHMPAMs) were characterized. The increase in C18DMAAC content resulted in decreased intrinsic viscosity and increased the Huggins constant for SHMPAMs. Similar results were observed for LHMPAMs. With similar intrinsic viscosity and C18DMAAC content, the Huggins constant of SHMPAMs was much higher than that of LHMPAMs, which could be due to the fact that SHMPAMs had much stronger intramolecular interaction in dilute polymer solutions. In semi-dilute solutions, the apparent viscosity of SHMPAMs was increased with increasing C18DMAAC content, which was similar to that of LHMPAMs. However, SHMPAMs exhibited higher apparent viscosity than LHMPAMs because it had more arms and thus had more chances to form three-dimensional networks in semi-dilute solutions. In the flow-induced scission experiment, SHMPAMs exhibited superior shear stability in comparison with LHMPAMs. When the strain rate was ≈40,000 s-1, the reduction ratios of the apparent viscosities of the four SHMPAMs after the scission were approximately 80%. By contrast, when the strain rate was ≈20,000 s-1, the reduction ratio of the apparent viscosity of LHMPAM-0.40 had already reached around 80%.

Dilute solutions of nylon 12—II. Relationship between intrinsic viscosity and molecular weight

1978 ◽  
Vol 14 (10) ◽  
pp. 807-810 ◽  
Author(s):  
B. Lánská ◽  
M. Bohdanecký ◽  
J. Šebenda ◽  
Z. Tuzar
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Dilute Solutions ◽  
Nylon 12
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