Hepta isobutyl polyhedral oligomeric silsesquioxanes (hib-POSS)

Blanco, Ignazio; Abate, L.; Bottino, Francesco A.; Bottino, Paola

doi:10.1007/s10973-011-2050-3

Cited by 52 publications

(42 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many literature data indicate that the introduction of nanosized POSSs into polymers gives rise to nanocomposites showing better thermal properties than virgin polymers [20,21] and that the nature and number of the organic substituents attached to a silicon-oxygen cage largely affect not only the characteristics of POSSs [22,23], but also those of the systems prepared with them. Due to the relevant and increasing technological importance of POSSs, our group has planned and has in progress a wide research on the synthesis and the characterization of novel variously substituted POSSs with high resistance to thermal degradation, coupled with sufficiently good compatibility and solubility in polymer matrix [24,25], that can be used in the preparation of thermally stable polystyrene (PS) based nanocomposites [26,27]. High thermal stability is requested for these compounds because they can be subjected to high temperatures during processing or in service [28].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

Blanco

Abate

Bottino

et al. 2015

J Inorg Organomet Polym

View full text Add to dashboard Cite

The resistance to the thermal degradation of some polystyrene (PS) based nanocomposites, containing as filler novel aliphatic and aromatic hepta-cyclopentyl bridged polyhedral oligomeric silsesquioxanes (POSSs), was evaluated in both inert and oxidative atmospheres. The fillers were formed by two identical silicon cages R 7 (SiO 1.5 ) 8 (R = cyclopentyl) linked to several aliphatic [-(CH 2 ) 2 -, -(CH 2 ) 6 -and -(CH 2 ) 10 -] and aromatic (Ar, Ar-Ar, Ar-O-Ar and Ar-S-Ar) bridges, where Ar = p-C 6 H 4 . Nanocomposites were prepared by in situ polymerization of styrene in the presence of 5 % w/w of appropriate POSS. The actual filler content in the products obtained, checked by 1 H NMR spectroscopy, resulted in all cases slightly higher than in starting mixtures. The glass transition temperature (T g ) was also determined by Differential Scanning Calorimetry. The degradation of nanocomposites was carried out into a thermobalance and the temperatures at 5 % mass loss (T 5 % ) were determined to evaluate the resistance to the thermal degradation which resulted, for the compounds here studied, higher not only than PS, but also than those of the nanocomposites filled with the corresponding hepta-isobutyl POSSs. The results were compared and discussed and suggested that the increments of resistance to thermal degradation in respect to neat PS (T 5 % of nanocomposite -T 5 % of PS) obey to an additivity group law.

show abstract

Section: Introductionmentioning

confidence: 99%

“…We thus synthesized some POSSs with aliphatic and aromatic bridges, with both isobutyl [30,31] and cyclopentyl [32] peripheries. Their thermal decomposition was studied and higher thermal stability was evidenced for cyclopentyl derivatives than for the isobutyl ones.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

Blanco

Abate

Bottino

et al. 2015

J Inorg Organomet Polym

View full text Add to dashboard Cite

show abstract

“…Some RR' 7 (SiO 1.5 ) 8 POSSs (where R' = cyclopentyl or isobutyl and R = C 6 H 5 -or one of its mono-, di-or tri-substituted derivatives) were previously synthesized and characterized [30,31], owing to their good compatibility and solubility in polymer matrices due to the presence of aliphatic and cycloaliphatic groups linked to silicon cage [32][33][34][35]. The results obtained indicated better thermal properties for heptacyclopentyl-POSSs in comparison with the corresponding heptaisobutyl-derivatives, and, in particular, phenyl, heptacyclopentyl-POSS (ph,hcp-POSS) appeared the most thermally stable [30,31]. Starting from this finding, ph,hcp-POSS/ PS nanocomposites were thus prepared by in situ polymerization of styrene in the presence of 3, 5 and 10% w/w of filler [36].…”

mentioning

confidence: 99%

Phenyl hepta cyclopentyl – polyhedral oligomeric silsesquioxane (ph,hcp-POSS)/Polystyrene (PS) nanocomposites: the influence of substituents in the phenyl group on the thermal stability

Blanco

Abate²,

Antonelli³

et al. 2012

Express Polym. Lett.

Self Cite

View full text Add to dashboard Cite

“…IC-POSS derivative 4a 27 and CC-POSS derivatives 7a, 33 7b, 34 and 8a 35 were prepared by following the literatures. Chlorodimethylsilane, chloro(ethyl)dimethylsilane, chlorodimethylvinylsilane, chlorodimethylphenylsilane, vinylcyclohexane, and octaphenyl-POSS (8b) were purchased from Tokyo Chemical Industry Co. (TCI) (Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

Fabrication of composite films with poly(methyl methacrylate) and incompletely condensed cage‐silsesquioxane fillers

Yuasa

Sato

Imoto

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyhedral oligomeric silsesquioxane (POSS) is a promising nanofiller for tuning properties of optically transparent polymer materials. On the other hand, traditional completely condensed POSS (CC-POSS) has a fundamental problem for fabricating optically transparent composite films; CC-POSS has high crystallinity due to its symmetrical structure, resulting in aggregation in the polymer matrices. In this work, we have demonstrated that incompletely-condensed POSS (IC-POSS), which has an open-cage structure, can be well dispersed in a poly(methyl methacrylate) (PMMA) matrix. IC-POSS with various substituents were readily synthesized, and their composite films of PMMA were fabricated by solution-casting method. High transparency was achieved with up to 30 wt % of the IC-POSS fillers, while the CC-POSS analogues caused phase separation with 10 wt % loading. Addition of the IC-POSS fillers can improve thermal stability and control glass transition temperature by the substituent structure. Additionally, refractive index was tuned from 1.485 to 1.513.

show abstract

Hepta isobutyl polyhedral oligomeric silsesquioxanes (hib-POSS)

Cited by 52 publications

References 32 publications

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

Phenyl hepta cyclopentyl – polyhedral oligomeric silsesquioxane (ph,hcp-POSS)/Polystyrene (PS) nanocomposites: the influence of substituents in the phenyl group on the thermal stability

Fabrication of composite films with poly(methyl methacrylate) and incompletely condensed cage‐silsesquioxane fillers

Contact Info

Product

Resources

About