Morphology and crystallization kinetics of polyethylene/long alkyl-chain substituted Polyhedral Oligomeric Silsesquioxanes (POSS) nanocomposite blends: A SAXS/WAXS study

Heeley, Ellen L.; Hughes, Darren J.; Aziz, Youssef El; Taylor, Peter G.; Bassindale, Alan R.

doi:10.1016/j.eurpolymj.2013.11.020

Cited by 42 publications

(53 citation statements)

References 50 publications

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“… demonstrated for PP/POSS composites, that the presence of long alkyl substituents in the octakis(alkyl)octasilsesquioxane molecules enhanced filler dispersion. A beneficial effect of long alkyl‐chain substituted silsesquioxane fillers in the polyolefin matrix was also described by other authors .…”

Section: Resultssupporting

confidence: 67%

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

et al. 2018

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Non‐functionalized and n‐alkyl‐functionalized siloxane‐silsesquioxane resins (S4SQ) were synthesized and characterized to confirm their structure and properties. Polypropylene (PP) composites with S4SQ resins as fillers were prepared by the melt blending. The influence of the kinds and amounts of fillers on the structural, morphological and thermal properties as well as mechanical characteristics and processability was determined. High compatibility of composites with functionalized resins resulted in more homogenous dispersion of filler particles in comparison with the composites which contained a non‐functionalized resin. Moreover, the introduction of S4SQ resins into PP strongly affected the crystalline structure of the polymer matrix and the free‐volume properties of composites. Siloxane‐silsesquioxane resins changed the contributions of the α‐ and β‐crystalline phases and they increased the crystal sizes of PP. The PP/S4SQ composites were also characterized by the improved crystallization temperature and crystallinity degree while the melting temperature and processability were changed only slightly. The mechanical properties of the PP/S4SQ materials were found to be dependent mostly on the degree of filler dispersion and crystalline structure of the composite materials. POLYM. COMPOS., 40:3101–3114, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 67%

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

et al. 2018

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“…However, in the case of the polyolefin composites, POSS fillers with relatively short alkyl substituents (from methyl to iso ‐octyl) on the silicon‐oxygen core were mainly used . Long alkyl chain groups, when attached to the POSS cage, are expected to ensure better compatibility with the polyolefin matrix and thus this could result in the desirable improvement of properties of the prepared composite materials. However, the number of reports related to the materials with POSS which contain long n ‐alkyl chain substituents (from n ‐octyl to n ‐octadecyl) is still limited .…”

Section: Introductionmentioning

confidence: 99%

“…X‐ray diffraction methods are commonly used to analyze the crystalline structures of composite materials . Moreover, they have been also proved to be very useful in determination of filler dispersion in the case of polymer matrix composites containing the 2D layered fillers or other crystalline fillers , including POSS molecules . Another widely used tool to investigate homogeneity of polymer composites is assessment of rheological and/or viscoelastic properties.…”

Section: Introductionmentioning

confidence: 99%

Study and evaluation of dispersion of polyhedral oligomeric silsesquioxane and silica filler in polypropylene composites

et al. 2018

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Various methods were used for evaluation of homogeneity of polypropylene (PP) matrix composites with octakis([n‐octyl]dimethylsiloxy)octasilsesquioxane, octakis([n‐octadecyl]dimethylsiloxy)octasilsesquioxane, and silica (SiO2) fillers. The filler dispersion was determined on the basis of the results from the wide‐angle X‐ray scattering (WAXS) analysis, from the tests of selected mechanical properties, from scanning electron microscopy (SEM) with energy dispersive X‐ray spectroscopy and from the decomposable entropic descriptor method. The use of different methods allowed to evaluate homogeneity of PP composites on various levels and with different precisions. The dispersion degree was found to be mostly depended on the kind and amount of the filler used. The presence of long n‐alkyl chain substituents in POSS molecules greatly improved the level of filler dispersion in the polymer matrix in comparison to silica which was visually assessed by SEM. The WAXS method revealed the formation of filler aggregates in the PP matrix which influenced the structural characteristic of PP composites and changed the mechanical properties of those materials. However, the decomposable entropic descriptor method provided the possibility of quantitative and the most objective estimation of homogeneity of the obtained composite materials. POLYM. COMPOS., 40:1354–1364, 2019. © 2018 Society of Plastics Engineers

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“…However, it should be mentioned that the papers published to date covered mainly the properties of polyolefin/POSS nanocomposites which contained POSS molecules with relatively short alkyl chain substituents (from methyl to iso-octyl) [20][21][22][25][26][27][28][29][30]. Only few papers related to nanocomposites with long alkyl chain substituents (from n-octyl to n-octadecyl) on the T 8 POSS core [31,32] and most of those studies focused on PP/POSS [20-22, 25, 28-30] and LDPE/POSS [26,27,31,32] nanocomposites, while studies on HDPE/POSS nanocomposites were limited [33].…”

Section: Introductionmentioning

confidence: 99%

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

Niemczyk

Dziubek

Sacher-Majewska

et al. 2016

J Therm Anal Calorim

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The effect of incorporation of octakis({alkyl} dimethylsiloxy)octasilsesquioxanes molecules with n-octyl, n-octadecyl and 4-methyl-hexyl substituents on thermal properties of polypropylene (PP), low-density polyethylene (LDPE) and high-density polyethylene (HDPE) was investigated. Thermal properties of those composite materials were evaluated by means of the differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) methods. The type and mass% content of POSS nanofillers influenced the crystallization and melting properties as well as thermal stability of the obtained polyolefin nanocomposites. The incorporated POSS particles-acting as nucleating agents-improved the crystallization process of those polyolefin materials. The POSS nanofiller with n-octyl substituents turned out the most effective nucleating agent. The addition of POSS nanofiller particles into the polyolefin matrix affected the melting behavior of the nanocomposites obtained, decreasing their melting temperatures. Thermal stability under nitrogen as well as in air atmosphere was most significantly enhanced for polyolefin nanocomposites contained the POSS with n-octadecyl substituents. That may result from improved compatibility of the POSS structure with long n-alkyl chain substituents at the silicon-oxygen core. The uniform dispersion of the long n-alkyl chainsubstituted POSS was confirmed by SEM analysis.

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Morphology and crystallization kinetics of polyethylene/long alkyl-chain substituted Polyhedral Oligomeric Silsesquioxanes (POSS) nanocomposite blends: A SAXS/WAXS study

Cited by 42 publications

References 50 publications

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

Study and evaluation of dispersion of polyhedral oligomeric silsesquioxane and silica filler in polypropylene composites

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

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