Polypropylene random copolymer/MWCNT nanocomposites: Isothermal crystallization kinetics, structural, and morphological interpretations

Verma, Pawan Kumar; Choudhary, Veena

doi:10.1002/app.41734

Cited by 21 publications

(16 citation statements)

References 62 publications

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“…The reported n and k values are summarized in S1–S3. An alternative way to calculate k from t 1/2 (designated as k ′ in Tables S1–S3) is given as :

k^{'} = \frac{true}{\ln 2}

…”

Section: Resultssupporting

confidence: 84%

“…The Avrami index n is in between 2 and 3 for both neat PP and PP/f‐MWNT nanocomposites (Tables S1–S3, Fig. d) which is similar to the reported values of isotactic PP and their nanocomposites in the literature . For polymers, the ideal Avrami index is expected to be 3 and 4 for heterogeneous and homogenous nucleation, respectively, for the three‐dimensional growth .…”

Section: Resultssupporting

confidence: 84%

“…S2. The fitting was performed not considering the deviations from linearity due to the onset of secondary crystallization at longer t that cannot be described by Avrami equation . The reported n and k values are summarized in S1–S3.…”

Section: Resultsmentioning

confidence: 99%

“…In general, there are two mutually opposite effects of fillers on the crystallization behavior, namely: heterogeneous nucleation ability and crystal growth retardation, both of which are related to the filler concentration and dispersion quality. Various approaches have been adopted to modify the surface chemistry of fillers through polymer grafting or chemical functionalization in order to improve their dispersion quality . The effect of these surface modifications on the crystallization and melting behavior as compared with their unmodified counterparts is summarized in Tables and .…”

Section: Introductionmentioning

confidence: 99%

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Effect of interfacial chemistry on crystallization of polypropylene/multiwall carbon nanotube nanocomposites

Wang

Gulgunje

Ghoshal

et al. 2019

Polymer Engineering & Sci

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This study systematically investigates the polymer–carbon nanotube (CNT) interaction when the interphase is tailored. Maleic anhydride‐grafted‐polypropylene (MA‐g‐PP) or polypropylene (PP) was noncovalently coated onto acid functionalized multiwall nanotube (f‐MWNT) through solution mixing. These coated f‐MWNTs were melt microcompounded with neat PP to form PP/f‐MWNT nanocomposites. The effects of functional groups and the thin layer of solution processed polymers, namely, MA‐g‐PP or PP, at the PP/f‐MWNT interface on crystallization and on melting behavior of matrix PP were investigated. The results were compared with a pristine MWNT (p‐MWNT) incorporated system. It was shown that PP coated CNTs can serve as a strong nucleating agent for templated polymer crystal growth. Unlike other PP nanocomposites in the literature, a relatively high shift of 7°C in melting peak maximum (Tp), along with a sharp melt endotherm was achieved with the addition of 0.3 wt% f‐MWNT via PP/f‐MWNT master batch. This indicates refinement of matrix PP crystalline region due to the tailored f‐MWNT surface chemistry. With a designed self‐seeding and templated crystal growth approach, columnar crystalline interphases were found surrounding MWNT which melted at 10.5°C higher temperature than neat PP crystallized without undergoing the same heat treatment protocol. POLYM. ENG. SCI., 59:1570–1584 2019. © 2019 Society of Plastics Engineers

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“…The reported n and k values are summarized in S1–S3. An alternative way to calculate k from t 1/2 (designated as k ′ in Tables S1–S3) is given as :

k^{'} = \frac{true}{\ln 2}

…”

Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of interfacial chemistry on crystallization of polypropylene/multiwall carbon nanotube nanocomposites

Wang

Gulgunje

Ghoshal

et al. 2019

Polymer Engineering & Sci

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show abstract

“…Three samples for each specimen type of %10 mg were subjected to a heating scan of 25-420 C, at a rate of 10 C min À1 , to evaluate the glass transition (T g ) and melting (T m ) temperatures, where the melting temperature and heat of fusion were taken from the second heating cycle to eliminate the influence of thermal history. [30] The degree of crystallinity (χ c ) of the samples was calculated [31] by…”

Section: Thermophysical and Surface Properties Of 3d-printed Peek Sammentioning

confidence: 99%

Additively Manufactured Polyetheretherketone (PEEK) with Carbon Nanostructure Reinforcement for Biomedical Structural Applications

et al. 2020

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This study is focused on carbon nanostructures (CNS), including both carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs), reinforcement of medical‐grade polyetheretherketone (PEEK), and in vitro bioactivity for biomedical structural applications. CNS/PEEK scaffolds and bulk specimens, realized via fused filament fabrication (FFF) additive manufacturing, are assessed primarily in the low‐strain linear‐elastic regime. 3D printed PEEK nanocomposites are found to have enhanced mechanical properties in all cases while maintaining the desired degree of crystallinity in the range of 30–33%. A synergetic effect of the CNS and sulfonation toward bioactivity is observed—apatite growth in simulated body fluid increases by 57% and 77%, for CNT and GNP reinforcement, respectively, doubling the effect of sulfonation and exhibiting a fully‐grown mushroom‐like apatite morphology. Further, CNT‐ and GNP‐reinforced sulfonated PEEK recovers much of the mechanical losses in modulus and strength due to sulfonation, in one case (GNP reinforcement) increasing the yield and ultimate strengths beyond the (non‐sulfonated) printed PEEK. Additive manufacturing of PEEK with CNS reinforcement demonstrated here opens up many design opportunities for structural and biomedical applications, including personalized bioactivated surfaces for bone scaffolds, with further potential arising from the electrically conductive nanoengineered PEEK material toward smart and multifunctional structures.

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Industrially viable technique for the preparation of HDPE/fly ash composites at high loading: Thermal, mechanical, and rheological interpretations

Verma

Kumar

Chauhan

et al. 2017

J of Applied Polymer Sci

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This article describes an industrially viable melt blending approach for the preparation of high‐density polyethylene (HDPE)/fly ash composites having high loading of fly ash (FA) (up to 25 wt %). In this approach, solvent was used to enhance the mixing of FA in HDPE matrix. FA coated on the outer surface of HDPE granules using solvent is an economical technique for the incorporation of high loading of FA using conventional twin screw extruder. Herein, the effect of HDPE reinforced with FA on thermal, rheological, and mechanical properties has been investigated. Incorporation of FA in HDPE matrix resulted in higher storage modulus (E′), loss modulus (E″), and complex viscosity (η*) as compared to neat polymer. Tensile and flexural moduli were also found to increase (∼47% and ∼66%, respectively) with the addition of FA (25 wt %). However, the elongation at break of HDPE reduced as the rigid spherical FA particles do not undergo elongation. The dispersion of FA within the polymer matrix and interaction of FA with HDPE were investigated using scanning electron microscopy. Rheological and mechanical properties of the composites were also correlated with the morphology. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45995.

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Polypropylene random copolymer/MWCNT nanocomposites: Isothermal crystallization kinetics, structural, and morphological interpretations

Cited by 21 publications

References 62 publications

Effect of interfacial chemistry on crystallization of polypropylene/multiwall carbon nanotube nanocomposites

Effect of interfacial chemistry on crystallization of polypropylene/multiwall carbon nanotube nanocomposites

Additively Manufactured Polyetheretherketone (PEEK) with Carbon Nanostructure Reinforcement for Biomedical Structural Applications

Industrially viable technique for the preparation of HDPE/fly ash composites at high loading: Thermal, mechanical, and rheological interpretations

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