Polypropylene/polyhedral oligomeric silsesquioxane nanocomposites – study of free volumes, crystallinity degree and mass flow rate

Niemczyk, Arkadiusz; Dziubek, Katarzyna; Czaja, Krystyna; Szatanik, R.; Szołyga, Mariusz; Dutkiewicz, Michał; Marciniec, Bogdan

doi:10.14314/polimery.2016.610

Cited by 14 publications

(15 citation statements)

References 2 publications

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“…Interestingly, some correlation between the MFR and I 4 values (from PALS) may be found which proves that the number of free volumes in the amorphous phase of PP significantly affected the processability of the obtained composite materials. A strong relation between the MFR values and the intensity of the o ‐Ps formation for the polymer matrix composites was also reported in our previous papers .…”

Section: Resultssupporting

confidence: 86%

“… 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%

“…The positron source ( 22 Na) with the activity of 0.9 MBq was sandwiched between two identical samples of the polymeric materials. The lifetime spectra were deconvoluted into four lifetime components with the lifetimes τ i and their intensities I i ( i = 1, 2, 3, and 4) using the Lifetime computer software .…”

Section: Methodsmentioning

confidence: 99%

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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: 86%

Section: Resultssupporting

confidence: 67%

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

et al. 2018

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“…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%

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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“…In the case of polyolefin nanocomposites with POSS fillers, polypropylene‐based nanocomposites absorbed the most attention and effort . Whereas there are only a few works in the literature, which report the characteristic of polyethylene/POSS nanocomposites for which there is a lack of comprehensive and comparative studies of different properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

Study of polyethylene nanocomposites with polyhedral oligomeric silsesquioxane nanofillers—from structural characteristics to mechanical properties and processability

et al. 2017

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Polypropylene/polyhedral oligomeric silsesquioxane nanocomposites – study of free volumes, crystallinity degree and mass flow rate

Cited by 14 publications

References 2 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 polyethylene nanocomposites with polyhedral oligomeric silsesquioxane nanofillers—from structural characteristics to mechanical properties and processability

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