From Heterogeneous to Homogeneous Nucleation of Isotactic Poly(propylene) Confined to Nanoporous Alumina

Duran, Hatïce; Steinhart, Martin; Butt, Hans‐Jürgen; Floudas, George

doi:10.1021/nl200153c

Cited by 181 publications

(281 citation statements)

References 38 publications

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“…On the other hand, once the copolymer is infiltrated in the AAO nanopores, confinement causes a dramatic reduction of the PEO block crystallization temperature. A similar behavior has been reported for PEO and other polymers that have been infiltrated in AAO templates, like PP, PE, sPS and PVDF . In the case of

B {normald}_{21} - b - E {normalO}_{79}^{257}

diblock copolymer within a 35 nm AAO template, the crystallization temperature of the PEO block experience a reduction of 72.2 °C upon infiltration of the material.…”

Section: Resultssupporting

confidence: 75%

Confinement Induced First Order Crystallization Kinetics for the Poly(ethylene oxide) Block within A PEO‐b‐PB Diblock Copolymer Infiltrated within Alumina Nano‐Porous Template

Michell

Blaszczyk-Lezak

Mijangos

et al. 2014

Macromolecular Symposia

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Summary We report homogeneous nucleation and first order crystallization kinetics for the PEO block within a PEO‐b‐PB diblock copolymer infiltrated within alumina nanopores. For the highly confined heterogeneity free PEO block nano‐domains, the overall crystallization kinetics is dominated by nucleation and therefore becomes first order. The nucleation mechanism changes from heterogeneous nucleation for the PEO block within the uninfiltrated copolymer (since it has a composition with 79% PEO that conforms a percolated matrix) to homogeneous nucleation for confined and isolated heterogeneity free nanodomains.

show abstract

B {normald}_{21} - b - E {normalO}_{79}^{257}

diblock copolymer within a 35 nm AAO template, the crystallization temperature of the PEO block experience a reduction of 72.2 °C upon infiltration of the material.…”

Section: Resultssupporting

confidence: 75%

Confinement Induced First Order Crystallization Kinetics for the Poly(ethylene oxide) Block within A PEO‐b‐PB Diblock Copolymer Infiltrated within Alumina Nano‐Porous Template

Michell

Blaszczyk-Lezak

Mijangos

et al. 2014

Macromolecular Symposia

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“…The molten polymer and polymer solution flowing ability depends strongly on filtration methods . Confinement of AAO porous walls alters the polymer molecular orientation and dynamics of polymer chains , and affects the nanostructure crystallization , glass temperature , polymer tacticity , and electron transportation . Modification of the AAO surface chemistry alters the polymer molecular chain orientation .…”

Section: Introductionmentioning

confidence: 99%

One-dimensional polymer nanofiber arrays with high aspect ratio obtained by thermal nanoimprint method

et al. 2016

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Polymer surface modification that mimicks natural behaviors has been a subject of great interest. Fabrication of polymer nanofiber arrays with various applications has been studied intensively. Avoidance of chemical solvents, reduction of processing time, improvement of the nanofiber size distribution and aspect ratios, and improvement of reproducibility have been sought for industrial value creation. This study examines an alternative fabrication methods for polymer nanofiber arrays using a combination of anodic aluminum oxide (AAO) nanoporous template and thermal nanoimprinting lithography for simple, precise processing. Based on those results, nanofiber arrays were fabricated with 40‐µm‐thick film and 50–100 nm fiber diameter polystyrene (PS) and polypropylene (PP). For this study, 50‐nm diameter PS nanofibers with 50 µm maximum length and a maximum aspect ratio of 1,000 were produced in addition to PP nanofibers having 130 µm maximum length and an aspect ratio of 2,600. The nanofiber lengths were affected considerably by molten polymer flow related to imprint processing conditions, polymer properties, AAO properties, and surface wettability between AAO and molten polymers. Moreover, AAO nanoconfinement demonstrated molecular orientation alignment of polymers that affect thermal properties, crystallinity, and mechanical properties of the obtained polymer nanofiber arrays. POLYM. ENG. SCI., 57:214–223, 2017. © 2016 Society of Plastics Engineers

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“…It is also sensitive on the structure of the crystalline phase to be formed. Given the growing evidence of textured crystallization of molecular building blocks, encompassing not only the spherical systems presented here, but also rod-like (nalkanes 66,67 , n-alcohols 68,69 , liquid crystalline 70 ) as well as polymeric molecular species [71][72][73] , we believe that our finding is of particular interest with regard to the effective control of crystalline orientation in templating matter by nanoporous templates 3 .…”

Section: Discussionmentioning

confidence: 75%

Capillary condensation, freezing, and melting in silica nanopores: A sorption isotherm and scanning calorimetry study on nitrogen in mesoporous SBA-15

2012

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Condensation, melting and freezing of nitrogen in a powder of mesoporous silica grains (SBA-15) has been studied by combined volumetric sorption isotherm and scanning calorimetry measurements. Within the mean field model of Saam and Cole for vapor condensation in cylindrical pores a liquid nitrogen sorption isotherm is well described by a bimodal pore radius distribution. It encompasses a narrow peak centered at 3.3 nm, typical of tubular mesopores, and a significantly broader peak characteristic of micropores, located at 1 nm. The material condensed in the micropores as well as the first two adsorbed monolayers in the mesopores do not exhibit any caloric anomaly. The solidification and melting transformation affects only the pore condensate beyond approx. the second monolayer of the mesopores. Here, interfacial melting leads to a single peak in the specific heat measurements. Homogeneous and heterogeneous freezing along with a delayering transition for partial fillings of the mesopores result in a caloric freezing anomaly similarly complex and dependent on the thermal history as has been observed for argon in SBA-15. The axial propagation of the crystallization in pore space is more effective in the case of nitrogen than previously observed for argon, which we attribute to differences in the crystalline textures of the pore solids.

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From Heterogeneous to Homogeneous Nucleation of Isotactic Poly(propylene) Confined to Nanoporous Alumina

Cited by 181 publications

References 38 publications

Confinement Induced First Order Crystallization Kinetics for the Poly(ethylene oxide) Block within A PEO‐b‐PB Diblock Copolymer Infiltrated within Alumina Nano‐Porous Template

Confinement Induced First Order Crystallization Kinetics for the Poly(ethylene oxide) Block within A PEO‐b‐PB Diblock Copolymer Infiltrated within Alumina Nano‐Porous Template

One-dimensional polymer nanofiber arrays with high aspect ratio obtained by thermal nanoimprint method

Capillary condensation, freezing, and melting in silica nanopores: A sorption isotherm and scanning calorimetry study on nitrogen in mesoporous SBA-15

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