Polymerization of Rodlike Micelles

Kline, S. J.

doi:10.1021/la981451o

Cited by 109 publications

(166 citation statements)

References 31 publications

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“…This enhanced stability may be, in part, due to the nature of the polymerized material. Observed stability is similar to that of the described cationic, rodlike polymeric micelles [21].…”

Section: Polymeric Micellessupporting

confidence: 81%

Preparation of polymeric nanoparticles using a new polymerizable surfactant

et al. 2011

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Abstract:A novel polymerizable surfactant (so-called surfmer) was synthesized and characterized according to its structure, surface activity and polymerization ability. Polymeric micelles (size of 6 and 130 nm) appeared in the polyreaction initiated by free radicals from VA-044. In the presence of the monomer (i.e., methyl methacrylate) microemulsion systems were formed that in turn were transformed into latex entities (size -40 nm). Additionally, an emulsion polymerization was performed with the use of n-hexadecane as an oil phase resulting in the production of nanocapsules (size in the range -165-220 nm). The shape and morphologies of the nanoobjects were confirmed using Atomic Force Microscopy (AFM).

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“…This enhanced stability may be, in part, due to the nature of the polymerized material. Observed stability is similar to that of the described cationic, rodlike polymeric micelles [21].…”

Section: Polymeric Micellessupporting

confidence: 81%

Preparation of polymeric nanoparticles using a new polymerizable surfactant

et al. 2011

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“…The creation of the pCTVB aggregates has been described previously [Kline 1999], with all materials coming from the same sources identified. Additional cetyl trimethyl ammonium bromide (CTAB) surfactant was purchased from Fluka, and was thrice recrystalized in ethanol and acetone to ensure purity.…”

Section: Methodsmentioning

confidence: 99%

Surface rheology and interface stability.

Yaklin¹,

Cote²,

Moffat³

et al. 2010

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We have developed a mature laboratory at Sandia to measure interfacial rheology, using a combination of home-built, commercially available, and customized commercial tools. An Interfacial Shear Rheometer (KSV ISR-400) was modified and the software improved to increase sensitivity and reliability. Another shear rheometer, a TA Instruments AR-G2, was equipped with a du Noüy ring, bicone geometry, and a double wall ring. These interfacial attachments were compared to each other and to the ISR. The best results with the AR-G2 were obtained with the du Noüy ring. A Micro-Interfacial Rheometer (MIR) was developed in house to obtain the much higher sensitivity given by a smaller probe. However, it was found to be difficult to apply this technique for highly elastic surfaces. Interfaces also exhibit dilatational rheology when the interface changes area, such as occurs when bubbles grow or shrink. To measure this rheological response we developed a Surface Dilatational Rheometer (SDR), in which changes in surface tension with surface area are measured during the oscillation of the volume of a pendant drop or bubble. All instruments were tested with various surfactant solutions to determine the limitations of each. In addition, foaming capability and foam stability were tested and compared with the rheology data. It was found that there was no clear correlation of surface rheology with foaming/defoaming with different types of surfactants, but, within a family of surfactants, rheology could predict the foam stability. Diffusion of surfactants to the interface and the behavior of polyelectrolytes were two subjects studied with the new equipment. Finally, surface rheological terms were added to a finite element Navier-Stokes solver and preliminary testing of the code completed. Recommendations for improved implementation were given. When completed we plan to use the computations to better interpret the experimental data and account for the effects of the underlying bulk fluid. 4 ACKNOWLEDGMENTSThe authors gratefully acknowledge the support of the Laboratory Directed Research and Development (LDRD) Program. We would like to thank Edna S. Wong for her assistance in getting the Langmuir trough operational for the ISR. Rekha Rao (1512) was instrumental in the initial stages of developing the modeling approach and is a coauthor of Appendix C.5

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“…According to Kline,6,7) since CTAPVB forms short rodlike micelles at a = 0, the micellar solution shows low viscosity. Table I contains the lengths of CTAPVB rodlike micelles (L R ) at a = 0 formed in water, evaluated from SANS data obtained previously.…”

Section: Ph Dependence Of Micellar Structurementioning

confidence: 99%

“…Table I contains the lengths of CTAPVB rodlike micelles (L R ) at a = 0 formed in water, evaluated from SANS data obtained previously. 6) Kline assumed that CTAPVB micelles formed with N less than 1600 were rigid cylinders and the micelles bearing N more than 2700 were semi-flexible Table I. Number average molecular weight (M n ), distribution of molecular weight (M w /M n ) and degree of Polymerization (N ) for esterified HPVB, solvent used for polymerization; contour length of PVB -chain (l c ) and length of the rodlike micelles of CTAPVB at a = 0 (L R ).…”

Section: Ph Dependence Of Micellar Structurementioning

confidence: 99%

“…Number average molecular weight (M n ), distribution of molecular weight (M w /M n ) and degree of Polymerization (N ) for esterified HPVB, solvent used for polymerization; contour length of PVB -chain (l c ) and length of the rodlike micelles of CTAPVB at a = 0 (L R ). # calculated from Kline's SANS data 6) cylinders. According to him, we also assumed micelles of The h 0 value increased with increasing a and exceeded ca.…”

Section: Ph Dependence Of Micellar Structurementioning

confidence: 99%

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Viscoelastic Behavior of Aqueous Solutions of Charged Hybrid Threadlike Micelles

Nakamura

Takase

Shikata

2010

J. Soc. Rheol., Jpn

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We investigated the linear and non-linear viscoelastic behavior of aqueous solutions of hybrid threadlike micelles formed by cetyltrimethylammonium poly (p-vinylbenzoate) (CTAPVB) and some additive simple salts at various pH values. The system showed marked viscoelasticity at lower pH values ca. 2.5. The obtained mechanical relaxation time of the system was proportional to the molecular weight of the incorporated CTAPVB, and lengthened strongly depending on the species of anions in the order of the Hofmeister series. Remarkable stress overshoot phenomena related to strain-hardening were observed under start-up shear flow experiments at high shear rates. Distinct shearthickening never found in the previously studied threadlike micellar systems was observed in the system. The essential mechanism for viscoelastic behavior unique to the present hybrid threadlike micellar system was discussed.

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Polymerization of Rodlike Micelles

Cited by 109 publications

References 31 publications

Preparation of polymeric nanoparticles using a new polymerizable surfactant

Preparation of polymeric nanoparticles using a new polymerizable surfactant

Surface rheology and interface stability.

Viscoelastic Behavior of Aqueous Solutions of Charged Hybrid Threadlike Micelles

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