Two-Component Gelators and Nucleating Agents for Polypropylene Based upon Supramolecular Assembly

In the past 10 years, the molecular self-assembly and network formation of small molecule gelators has become one of the most active frontiers of the emergent area of nanochemistry. Increasingly, research efforts have begun to focus on multicomponent gelators, which rely on the initial interaction of distinct individual components to form a complex that subsequently self-assembles into a fibrous supramolecular polymer. In true two-component systems, an individual component can be present in isotropic solution, and only on addition of the second component will a gel actually form. In some cases, however, two-component gels are reported in which the second component significantly modifies the behaviour of a known gelator. Both systems are discussed in this article. The additional level of supramolecular control in the hierarchical self-assembly of two-component gels confers exquisite tunability and controllability. Functionality can be readily built into the material by simple variation of one of the individual components. This article discusses the key approaches used to control self-assembly by manipulating single molecular-recognition events and illustrates how controlling the transcription of information from the molecular to the macroscopic level by the simple addition of a second component allows complex functional materials to be selectively assembled from simple building blocks.

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“…[4] Shinkai and co-workers have also made use of barbiturate derivatives to generate two-component gels.…”

Section: Two-component Organogelatorsmentioning

confidence: 99%

Two‐Component Gel‐Phase Materials—Highly Tunable Self‐Assembling Systems

Hirst

Smith

2005

Chemistry A European J

352

134

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“…They are commonly used in the polymer industry to shorten injection‐molding cycle times, thus reducing production costs, generating smaller spherulites, and thus improving the optical and mechanical properties, as is the case for iPP 11. A large number of compounds were reported to nucleate the α form of iPP,10–14 and several others act as nucleating agents of the β form,15–27 depending on the dispersion and concentration of the additives and the cooling rates.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient nucleating additive for isotactic polypropylene studied by differential scanning calorimetry

Marco

Gómez

Ellis

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The influence of an organic phosphate derivative in the crystallization of the monoclinic phase of isotactic polypropylene was studied by differential scanning calorimetry. To analyze the nucleation activity of the additive, the self-nucleation process of the pure polymer was also studied by thermal techniques. A large increase in crystallization temperatures was obtained even for the lowest concentration of the additive, and its nucleating efficiency is the highest observed for ␣-nucleating agents in isotactic polypropylene. The nucleating agent was also observed to increase the stability of the crystals formed.

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“…Higher T m , ΔH, and lower ΔS values suggested that the GG organogels were more stable than the MG organogels. [37,38] Addition of drug did not cause any significant variation in the thermal properties of both the types of organogels.…”

Section: Thermal Analysismentioning

confidence: 92%

Development of mustard oil- and groundnut oil-based span 40 organogels as matrices for controlled drug delivery

Satapathy

Sagiri

Pal

et al. 2013

Designed Monomers and Polymers

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The present study deals with the development and characterization of sorbitan monopalmitate (SM) organogels using mustard oil (MO) and groundnut oil (GO) as the apolar phase. In both the cases, the organogels containing ≥ 20% (w/w) SM were found to be stable for prolonged period. The microscopic studies showed the presence of aggregates of tubular shaped gelator fibers in the gel architecture. Fourier transform infrared spectroscopy indicated formation of intermolecular hydrogen bonding amongst the oil and gelator molecules. Differential scanning colorimetry studies indicated that the thermal stability of GO organogels was found to be more than the MO organogels. Gels showed pseudoplastic flow, with shear thinning and thixotropic behavior. The drug release from the organogels followed Higuchian kinetics with non-Fickian diffusion. The pH values of organogels were found to be near the human skin pH and highly hemocompatible. Metronidazole loaded organogels have shown good antimicrobial activity against Bacillus subtilis. Based on the preliminary studies, the developed organogels may be tried as drug carriers.

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Two-Component Gelators and Nucleating Agents for Polypropylene Based upon Supramolecular Assembly

Cited by 48 publications

References 31 publications

Two‐Component Gel‐Phase Materials—Highly Tunable Self‐Assembling Systems

Two‐Component Gel‐Phase Materials—Highly Tunable Self‐Assembling Systems

Highly efficient nucleating additive for isotactic polypropylene studied by differential scanning calorimetry

Development of mustard oil- and groundnut oil-based span 40 organogels as matrices for controlled drug delivery

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