Crystal growth rate in ultrathin films of poly(ethylene oxide)

Dalnoki-Veress, Kari; Forrest, James A.; Massa, Michael V.; Pratt, Andrew; Williams, Adrian C.

doi:10.1002/polb.10018

Cited by 68 publications

(78 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, chains may be effectively pinned at surfaces (external or internal), thereby providing fixed contact points, which restrict molecular motion. Such interfacial effects have been proposed on the basis of diffusivity studies 10,14 and crystallization studies [11][12][13]15 and the literature suggests that pinning at interfaces is more likely than purely spatial confinement. There is no doubt that in our system the silica nano-spheres provide an enormous internal interfacial area, which, if the latter mechanism is effective, would provide a ready explanation for the reduction in growth rates.…”

Section: Discussionmentioning

confidence: 99%

“…This retardation in chain dynamics has been explained primarily through increased interfacial effects. [10][11][12][13][14][15] We have also previously observed an increase in glass transition temperature, T g , in amorphous polyurethanes filled with nanoscopic spheres of silica. 16 In the present work we focus on crystal growth rates, measured as the radial growth rate of spherulites.…”

mentioning

confidence: 99%

“…Additionally this is a material a) which has been used widely as an intercalating material in the nanocomposite community and b) in which crystalliza- tion in confined geometries has been examined previously. 15,19,[23][24][25][26] EXPERIMENTAL Materials Nano-silica, having an average particle diameter of about 12 nm, was obtained from Nissan Chemical Co. as ∼30 wt% dispersion in methylethylketone (MEK). The distribution of diameters ranged from 10-20 nm.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Spherulite Crystallization in Poly(ethylene oxide)–Silica Nanocomposites. Retardation of Growth Rates through Reduced Molecular Mobility

Waddon¹,

Petrovìć²

2002

Polym J

View full text Add to dashboard Cite

ABSTRACT:The spherulitic crystallization of nanocomposites of poly(ethylene oxide) (PEO) and silica nano-sphere filler particles was investigated using optical microscopy and differential scanning calorimetry (DSC). It was found that spherulite growth rates were retarded by the presence of the silica nano-particles. This was interpreted in terms of reduced molecular mobility caused by either geometric constraints in the confined small volumes between particles, or by an increase of the interfacial surface area at which polymer chains were pinned. There was an indication of lowering of final crystallinity and increase of amorphous content for heavily filled higher molecular weight polymer. Implications for conductivities of PEO when used as a solid electrolyte in applications such as batteries are considered.KEY WORDS Nanocomposites / Crystallization / Poly(ethylene oxide) (PEO) / Spherulite / Mobility / Constraint / Conductivity / In recent years well-defined particles with one or more dimensions on the scale of nanometers have been developed using various techniques. There is great interest in using such nano-particles in numerous applications, for example, optical, magnetic, electronic, and catalyst supports. 1, 2 A number of groups have used nano-particles in polymer composites in place of conventional fillers with the goals of improving properties, such as mechanical, barrier and thermal. In particular, there has been a significant level of interest in the use of clays as filler materials (e.g., ref 3-9). The incorporation of such nano-sized particles into host materials offers the possibility of producing materials justifiably termed "nanocomposites".There are three obvious but important differences between conventionally filled polymer composites and polymer nanocomposites. First, for fillers at the nanosize scale, traditional continuum materials science in which materials properties scale with volume fraction is no longer applicable. Second, for materials filled with even moderate volume fractions of nano-sized particles, the separation between particles will also be on the scale of nanometers. In the case of polymer matrices, this may be the same size scale as the pertinent chain parameters of the host polymer such as, for instance, the r.m.s. end-to-end chain distance or radius of gyration. At high enough loadings this may be expected to eventually introduce constraints on the topology of the chain, affecting chain dynamics and properties dependent on chain dynamics. Third, the incorporation of nanometer sized particles into a matrix introduces an enormous interfacial surface area into the system at which chain segments may be effectively pinned.There have been a number of studies using changes in diffusion properties or crystallizability reporting decreases in chain mobility when polymers are confined within thin films. This retardation in chain dynamics has been explained primarily through increased interfacial effects. [10][11][12][13][14][15] We have also previously observed an increase in glass tra...

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Spherulite Crystallization in Poly(ethylene oxide)–Silica Nanocomposites. Retardation of Growth Rates through Reduced Molecular Mobility

Waddon¹,

Petrovìć²

2002

Polym J

View full text Add to dashboard Cite

show abstract

“…Of the most commonly studied semi-crystalline polymeric materials, the crystallization of thin fi lms of poly(ethylene glycol) (PEG) have been extensively studied by a variety of techniques such as quartz crystal microbalance, [ 3 ] differential scanning calorimetry, [ 17 ] atomic force microscopy, [ 3,18 ] cross polarized optical microscopy [ 19 ] and x-ray scattering. Shi et al conducted a number of studies investigating the interplay between crystallization and phase separation in blends of PEG and PMMA, [ 20 ] however, these studies have concerned the phase separation and crystallization in polymer melts, and as such are only two component binary systems, which do not show the rich variety of morphologies accessible through solution processed systems.…”

Section: Doi: 101002/adma201302657mentioning

confidence: 99%

In Situ Studies of Phase Separation and Crystallization Directed by Marangoni Instabilities During Spin‐Coating

et al. 2013

View full text Add to dashboard Cite

Results of a pioneering study are presented in which for the first time, crystallization, phase separation and Marangoni instabilities occurring during the spin-coating of polymer blends are directly visualized, in real-space and real-time. The results provide exciting new insights into the process of self-assembly, taking place during spin-coating, paving the way for the rational design of processing conditions, to allow desired morphologies to be obtained.

show abstract

“…24 Both PLLA and PEO are semi-crystalline polymers with very different crystallization temperatures. [25][26][27] Reported crystallization temperatures of PLLA range from 80 to 130 o C. 28 At these temperatures, however, PEO is still in its molten state. The crystallization behaviors of PLLA/PEO blends are of great interest.…”

Section: Introductionmentioning

confidence: 99%

The relationship between morphology and impact toughness of poly(l-lactic acid)/poly(ethylene oxide) blends

Schultz

Chan

2015

Polymer

View full text Add to dashboard Cite

show abstract

Crystal growth rate in ultrathin films of poly(ethylene oxide)

Cited by 68 publications

References 20 publications

Spherulite Crystallization in Poly(ethylene oxide)–Silica Nanocomposites. Retardation of Growth Rates through Reduced Molecular Mobility

Spherulite Crystallization in Poly(ethylene oxide)–Silica Nanocomposites. Retardation of Growth Rates through Reduced Molecular Mobility

In Situ Studies of Phase Separation and Crystallization Directed by Marangoni Instabilities During Spin‐Coating

The relationship between morphology and impact toughness of poly(l-lactic acid)/poly(ethylene oxide) blends

Contact Info

Product

Resources

About