Tuning polymer crystallinity via the appropriate selection of inorganic nanoadditives

Papananou, Hellen; Perivolari, Eleni; Chrissopoulou, K.; Anastasiadis, Spiros H.

doi:10.1016/j.polymer.2018.10.018

Cited by 58 publications

(56 citation statements)

References 53 publications

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“…5a of ref. 21) showed that crystallinity starts decreasing at 4 >$10%; this is also in good agreement with the predicted value of 4 cr $ 11% using eqn (13). For the smallest particle of 14 nm the predicted value is 4 cr $ 2.42%; experimental values based on XRD measurement (Fig.…”

Section: Experimental Relevance and Future Prospectssupporting

confidence: 86%

Unravelling the effects of size, volume fraction and shape of nanoparticle additives on crystallization of nanocomposite polymers

Jabbarzadeh

Halfina

2019

Nanoscale Adv.

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Unravelling the eff ects of size, volume fraction and shape of nanoparticle additives on crystallization of nanocomposite polymers Nanoparticles can be added to polymer melts to make nanocomposites. This may lead to a two-tier crystallization with an initial enhancement of crystallization that depends on the particle shape, and confi nement-induced retardation of crystallization at a later stage that depends on the interparticle free space. This interparticle free space is a function of nanoparticle size and volume fraction and governs the fi nal crystallinity in the confi nement limit. Large scale molecular simulations have revealed the eff ects of particle shape, size and volume fraction.

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Section: Experimental Relevance and Future Prospectssupporting

confidence: 86%

Unravelling the effects of size, volume fraction and shape of nanoparticle additives on crystallization of nanocomposite polymers

Jabbarzadeh

Halfina

2019

Nanoscale Adv.

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“…In almost all PNCs CF is slightly increased, whereas T c strongly increases, from 110 °C up to 123 °C ( Table 1 ). This increase can be understood in terms of the fillers offering sites for additional crystallization (inset scheme to Figure 5 a) and acting, in this way, as additional crystallization nuclei, as has been found in different [ 7 , 38 , 39 , 55 , 56 , 57 , 58 , 59 ] and similar polymers [ 34 , 36 , 37 ]. In Figure 5 a, the stronger increase in nucleation is recorded in the graphene containing PNCs (P10Gr, P10Gr05S, P10Gr10S), while the effect of silica is significantly more limited (P10S, P10Gr25S).…”

Section: Resultsmentioning

confidence: 72%

Calorimetric and Dielectric Study of Renewable Poly(hexylene 2,5-furan-dicarboxylate)-Based Nanocomposites In Situ Filled with Small Amounts of Graphene Platelets and Silica Nanoparticles

et al. 2020

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Poly(hexylene 2,5 furan-dicarboxylate) (PHF) is a relatively new biobased polyester prepared from renewable resources, which is targeted for use in food packaging applications, owing to its great mechanical and gas barrier performance. Since both properties are strongly connected to crystallinity, the latter is enhanced here by the in situ introduction in PHF of graphene nanoplatelets and fumed silica nanoparticles, as well as mixtures of both, at low amounts. For this investigation, we employed Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and dielectric spectroscopy (BDS). The fillers were found to improve crystallization in both the rate (increasing Tc) and fraction (CF), which was rationalized via the concept of fillers acting as crystallization agents. This action was found stronger in the case of graphene as compared to silica. BDS allowed the detection of local and segmental dynamics, in particular in PHF for the first time. The glass transition dynamics in both BDS (α relaxation) and DSC (Tg) are mainly dominated by the relatively high CF, whereas in the PHF filled uniquely with silica strong spatial confinement effects due to crystals were revealed. Finally, all samples demonstrated the segmental-like dynamics above Tg, which screens the global chain dynamics (normal mode).

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“…The effect of nanoparticle size on the crystallization of poly(ethylene oxide) PEO/silica nanocomposites has been studied by Papananou et al [11]. They have shown that for the same %v of nanoparticles, the amount of crystallinity decreases by decreasing the particle size, and that depending on the particle size there is a particular volume fraction where the crystallization will be impeded by the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

The Origins of Enhanced and Retarded Crystallization in Nanocomposite Polymers

Jabbarzadeh

2019

Nanomaterials

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Controlling the crystallinity of hybrid polymeric systems has an important impact on their properties and is essential for developing novel functional materials. The crystallization of nanocomposite polymers with gold nanoparticles is shown to be determined by free space between nanoparticles. Results of large-scale molecular dynamics simulations reveal while crystallinity is affected by the nanoparticle size and its volume fraction, their combined effects can only be measured by interparticle free space and characteristic size of the crystals. When interparticle free space becomes smaller than the characteristic extended length of the polymer molecule, nanoparticles impede the crystallization because of the confinement effects. Based on the findings from this work, equations for critical particle size or volume fraction that lead to this confinement-induced retardation of crystallization are proposed. The findings based on these equations are demonstrated to agree with the results reported in experiments for nanocomposite systems. The results of simulations also explain the origin of a two-tier crystallization regime observed in some of the hybrid polymeric systems with planar surfaces where the crystallization is initially enhanced and then retarded by the presence of nanoparticles.

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Tuning polymer crystallinity via the appropriate selection of inorganic nanoadditives

Cited by 58 publications

References 53 publications

Unravelling the effects of size, volume fraction and shape of nanoparticle additives on crystallization of nanocomposite polymers

Unravelling the effects of size, volume fraction and shape of nanoparticle additives on crystallization of nanocomposite polymers

Calorimetric and Dielectric Study of Renewable Poly(hexylene 2,5-furan-dicarboxylate)-Based Nanocomposites In Situ Filled with Small Amounts of Graphene Platelets and Silica Nanoparticles

The Origins of Enhanced and Retarded Crystallization in Nanocomposite Polymers

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