Polyolefins with POSS

Pracellà, Mariano

doi:10.1007/978-3-030-02327-0_4

Cited by 5 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Represented in their most common form by the symbol T 8 and having a diameter usually falling in the range of 1.5–3 nm, these molecules comprise a silicon and oxygen cage completed by organic groups that are covalently bonded with silicon atoms [ 28 ]. The ability to be dispersed at the molecular level and to play an active role in the reinforcement of polymeric materials, unlike other fillers such as organoclays [ 29 ], carbon nanotubes [ 30 ], and nanofibers [ 31 , 32 ], makes POSS unique among nano-reinforcements [ 33 ]. Particular focus was devoted to polystyrene (PS)/POSS composites by synthesizing PS first reinforced with single-cage POSS molecules [ 34 , 35 ] and then with double-cage POSS [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

et al. 2020

View full text Add to dashboard Cite

A comprehensive kinetics degradation study is carried out on novel multiple cages polyhedral oligomeric silsesquioxane (POSS)/polystyrene (PS) composites at 5% (w/w) of POSS to assess their thermal behavior with respect to the control PS and other similar POSS/PS systems studied in the past. The composites are synthesized by in situ polymerization of styrene in the presence of POSSs and characterized by 1H-NMR. The characteristics of thermal parameters are determined using kinetics literature methods, such as those developed by Kissinger and Flynn, Wall, and Ozawa (FWO), and discussed and compared with each other and with those obtained in the past for similar POSS/PS composites. A good improvement in the thermal stability with respect to neat polymer is found, but not with respect to those obtained in the past for polystyrene reinforced with single- or double-POSS cages. This behavior is attributed to the greater steric hindrance of the three-cages POSS compared with those of single- or double-cage POSS molecules.

show abstract

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

et al. 2020

View full text Add to dashboard Cite

show abstract

“…They may also be used as antioxidants [ 23 ] or nanoparticle dispersants for plastics [ 24 , 25 ]. Cage siloxanes have been studied as functional and processing additives for polyolefins, e.g., polyethylene or polypropylene [ 26 ], as well as other thermoplastics, including PES [ 27 ], PPS [ 28 ], PEO [ 29 ], or different grades of polyamide (PA) [ 30 ]. The effect of these additives on the properties of the base polymer is highly dependent on the level of dispersion of the additive within the polymer matrix and the CS–matrix interactions (either macroscopic or molecular level ones).…”

Section: Introductionmentioning

confidence: 99%

Why POSS-Type Compounds Should Be Considered Nanomodifiers, Not Nanofillers—A Polypropylene Blends Case Study

et al. 2021

View full text Add to dashboard Cite

In this work, a seriTables of silsesquioxanes (SSQ) and spherosilicates (SS), comprising a group of cage siloxane (CS) compounds, was tested as functional additives for preparation of isotactic polypropylene (iPP)-based nanocomposites and discussed in the aspect of their rationale of applicability as such additives. For this purpose, the compounds were prepared by condensation and olefin hydrosilylation reactions. The effect of these cage siloxane products on properties of obtained CS/iPP nanocomposites was analyzed by means of mechanical, microscopic (scanning electron microscopy-energy dispersive spectroscopy), thermal (differential scanning calorimetry, thermogravimetry), thermomechanical (Vicat softening point) analyses. The results were compared with the previous findings on CS/polyolefin composites. The role of CS compounds was discussed in terms of plastic processing additives.

show abstract

“…This highly restricts their real-world applications as nanofillers for commodity polymers, such as polyolefin. 8 Besides, the compatibility of POSS with many polymers needs to be improved as homogenous dispersion of fillers in polymer matrix is highly desired in preparation of high-performance polymer/POSS nanocomposites. [9][10][11][12] Incorporating POSS onto polymer chains 13,14 or using reactive POSS as a crosslinker 15 can significantly promote the fine dispersion of nanosized POSS in polymer matrix and, consequently, enhance the thermal stability, mechanical, and biocompatibility properties of resultant polymer nanohybrid materials.…”

Section: Introductionmentioning

confidence: 99%

C30‐45 long‐chain alkyls modified silsesquioxane: A promising additive for polyethylene

Zhang

Fan

et al. 2021

Polymer Composites

View full text Add to dashboard Cite

A novel commercial available and inexpensive long-chain alkyl (C30-45) modified silsesquioxane, namely (C30-45 alkyl)dimethylsilyl polypropylsilsesquioxane (C30PSS), was applied as a functional filler for linear low density polyethylene (LLDPE). For comparison, LLDPE/octaisobutyl polyhedral oligomeric silsesquioxane (BuPOSS) nanocomposites were also prepared via melt blending. The chemical and crystalline structures of C30PSS and BuPOSS were first identified by Fourier transform infrared spectroscopy, solid 29 Si NMR, and X-ray diffraction. The dispersion of two fillers in the polymer matrix was analyzed via scanning electron microscopy and X-ray energy dispersive spectroscopy. The rheological, tensile, and thermal properties of pristine LLDPE, LLDPE/C30PSS, and LLDPE/BuPOSS composites were systematically studied. Our results showed that C30PSS can serve as a promising and low-priced filler for LLDPE with respect to its fine dispersion in LLDPE and its abilities to improve the rheological and mechanical properties of LLDPE.

show abstract

Polyolefins with POSS

Cited by 5 publications

References 51 publications

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

Why POSS-Type Compounds Should Be Considered Nanomodifiers, Not Nanofillers—A Polypropylene Blends Case Study

C30‐45 long‐chain alkyls modified silsesquioxane: A promising additive for polyethylene

Contact Info

Product

Resources

About