Inherently flame retardant vinyl bearing hyperbranched polysiloxanes having improved thermal stability-Ceramization and analysis of associated thermal properties

Indulekha, K.; Thomas, Deepthi; Supriya, N.; Ramanan, Rajeev; Mathew, Dona; Ninan, K. N.; Gouri, C.

doi:10.1016/j.polymdegradstab.2017.11.007

Cited by 18 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organo‐siloxanes on annealing at high temperature would give ceramics along with free carbon in the microstructure. Usually, free carbon is composed of disordered and ordered carbons . To know the nature of free carbon present in the pyrolysate obtained at 900°C and 1500°C, Raman spectra were analyzed (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Novolac‐Polydimethyl Siloxane networks through click chemistry: Thermal and Thermophysical characterization

Sunitha

Soumyamol

Mathew

et al. 2020

Int J Applied Ceramic Tech

Self Cite

View full text Add to dashboard Cite

Polydimethyl siloxane combs projecting from a novolac stem were synthesized using click reaction of azide-terminated polydimethylsiloxane (AZ-PDMS), and novolac propargyl ether (NPE) under ambient (30°C) conditions. Dynamic mechanical analyses (DMA) indicated the transition of soft segments at nearly −100°C and that of the hard segments in the range of 25°C-30°C. The hybrid novolac-siloxane networks have been found to possess an elongation at break of 100%-260%. Thermal degradation behavior of the networks of different crosslink densities was studied using TGA and pyrolysis GC-MS. Thermogravimetry revealed an anaerobic char residue of 23%-40% at 900°C. Further rise in temperature up to 1500°C has been observed to result in hardly 1% reduction in the char yield/ceramic residue, thus attributing to the presence of high char-yielding aromatic part. The ceramic residue obtained at 1500°C under argon atmosphere was analyzed using FTIR, Raman, and XRD. XRD studies implied formation of βSiC, and SiO 2 . Morphology of the ceramics conformed to nanowires with diameters in the range of 20-100 nm. The nanowire consisted of mainly SiOC as attested by EDS analysis. K E Y W O R D Schar yield, nanowire, pyrolysis

show abstract

Section: Resultsmentioning

confidence: 99%

Novolac‐Polydimethyl Siloxane networks through click chemistry: Thermal and Thermophysical characterization

Sunitha

Soumyamol

Mathew

et al. 2020

Int J Applied Ceramic Tech

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the cD 4 structure of polymeric materials might contribute to char formation at high temperatures, resulting in decreases in the formation of volatile and combustible molecules from their thermal degradation. Consequently, the cD 4 structure could contribute to enhance the flame retardancy of the polymeric materials 19–23 . Consideration of the development trends of flame retardants for polymers toward halogen‐ and phosphorus‐free, silicon‐containing compounds could be of potential flame‐retardant agents for the demands 19–23 …”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the cD 4 structure could contribute to enhance the flame retardancy of the polymeric materials. [19][20][21][22][23] Consideration of the development trends of flame retardants for polymers toward halogen-and phosphorus-free, siliconcontaining compounds could be of potential flameretardant agents for the demands. [19][20][21][22][23] 2 | EXPERIMENTAL…”

Section: Introductionmentioning

confidence: 99%

Thermosetting resins from a tetra‐functional vinylbenzene compound possessing cyclic siloxane cores

Lee

Chang

Liu

2021

Journal of Polymer Science

View full text Add to dashboard Cite

Cyclic siloxane is an attractive building block for incorporation of silicon‐containing units as well as their distinguished properties to polymer materials. This work reports the synthesis and characterization of a tetra‐functional vinylbenzene compound possessing cyclic siloxane cores (cD4‐4VB). Synthesis of cD4‐4VB is carried out using cD4‐4SiH as the reactive precursor and multiple‐step reactions, including hydrosilylation, deacetylation, and SN2 substitution. cD4‐4VB is an effective monomer for preparation of the corresponding cyclic silicon‐based thermosetting resins (CR‐cD4‐4VB). CR‐cD4‐4VB shows attractive film formability and good thermo‐mechanical properties, including a storage modulus of 2.0 GPa, a glass transition temperature of 282°C, a thermal stability above 400°C, a high char yield (at 800°C in nitrogen) of 55 wt%, and a dielectric constant of 3.12 at 10 GHz. This kind of resins have potential of application for halogen‐free flame retardants and high‐performance polymer films.

show abstract

“…[4][5][6][7] Therefore, the development of bio-based thermosetting resins is of far-reaching significance. [8,9] Bismaleimide (BMI) resins are important high performance thermosetting resins with a range of outstanding performance including superior mechanical and electrical properties, low flammability, excellent chemical resistance, and good thermal stability, [10][11][12][13][14] which makes BMI resins widely used for many high-tech fields such as aviation, aerospace, and electromechanical. [15,16] Most BMI resins are modified by petrochemical resources.…”

Section: Introductionmentioning

confidence: 99%

Bio‐based hydroxymethylated eugenol modified bismaleimide resin and its high‐temperature composites

Wang

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Hydroxymethylated eugenol (MEG) and poly (hydroxymethylated eugenol) (PMEG) were synthesized by the condensation reaction of eugenol (EG) with formaldehyde. The different contents of MEG and PMEG were used to modify 4,4 0-bismaleimidediphenylmethane (BMI). The cured MEG-BMI resins exhibit good thermal stability evidenced by its 5% weight loss temperatures above 407 C and its residue above 39.4% at 800 C under nitrogen. For carbon/MEG-BMI composites, their glass transition temperatures were around 400 C; their flexural strength and moduli were maintained at a range of 488.87-575.47 MPa and 48.84-60.26 GPa, respectively. With the increasing content of BMI in the resin formulation, the flexural properties decreased; comprehensively the composite with the eugenol/maleimide unit ratio (1:0.3 mol) had the best mechanical and thermal properties, meanwhile its renewable carbon content was as high as 57.80%. As a new candidate of high temperature thermosetting resin, MEG would find promising applications for advanced composites' matrice.

show abstract

Inherently flame retardant vinyl bearing hyperbranched polysiloxanes having improved thermal stability-Ceramization and analysis of associated thermal properties

Cited by 18 publications

References 31 publications

Novolac‐Polydimethyl Siloxane networks through click chemistry: Thermal and Thermophysical characterization

Novolac‐Polydimethyl Siloxane networks through click chemistry: Thermal and Thermophysical characterization

Thermosetting resins from a tetra‐functional vinylbenzene compound possessing cyclic siloxane cores

Bio‐based hydroxymethylated eugenol modified bismaleimide resin and its high‐temperature composites

Contact Info

Product

Resources

About