Enhanced Thermo-Mechanical Stiffness, Thermal Stability, and Fire Retardant Performance of Surface-Modified 2D MoS2 Nanosheet-Reinforced Polyurethane Composites

2018 ◽  
Vol 304 (1) ◽  
pp. 1800562 ◽  
Author(s):  
Kuruma Malkappa ◽  
Suprakas Sinha Ray ◽  
Neeraj Kumar
Keyword(s):  
Thermal Stability ◽  
Fire Retardant ◽  
Mechanical Stiffness ◽  
Mos2 Nanosheet ◽  
Surface Modified ◽  
Polyurethane Composites

scholarly journals Enhanced electrical and thermal properties of semi-conductive PANI-CNCs with surface modified CNCs

RSC Advances ◽  
2021 ◽  
Vol 11 (19) ◽  
pp. 11444-11456
Author(s):  
Po-Yun Chen ◽  
Chieh Hsu ◽  
Manikandan Venkatesan ◽  
Yen-Lin Tseng ◽  
Chia-Jung Cho ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
High Conductivity ◽  
Surface Modified ◽  
High Dispersibility

Biodegradable surface-modified CNCs were synthesized found high dispersibility and flexibility. Polyaniline-doped CNCs nanocomposites were exhibited high conductivity and thermal stability that may be promising for flexible semiconductors.

Thermal stability and plasmonic photothermal conversion of surface-modified solar nanofluids: Comparing prolonged and cyclic thermal treatments

2021 ◽  
Vol 244 ◽  
pp. 114463
Author(s):  
Omar Z. Sharaf ◽  
Nahla Rizk ◽  
Catherine J. Munro ◽  
Chakra P. Joshi ◽  
Waqas Waheed ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Treatments ◽  
Photothermal Conversion ◽  
Surface Modified

scholarly journals Changes in thermal stability of lignocelluloses waste aggregates long-term incorporated in composite

2021 ◽  
Vol 900 (1) ◽  
pp. 012042
Author(s):  
N Stevulova ◽  
A Estokova
Keyword(s):  
Thermal Stability ◽  
Alkaline Treatment ◽  
Cement Matrix ◽  
Scanning Calorimetry ◽  
Alkali Ions ◽  
Thermal Gravimetry ◽  
Pre Treatment ◽  
Surface Modified ◽  
Thermal Stability Of

Abstract This paper is addressed to comparative study of changes in thermal stability of surface-modified hemp-hurds aggregates long-term incorporated in bio-aggregate-based composites with the original ones before their integration into alternative binder matrix. In this study, the effectiveness of alkaline treatment of hemp hurds compared to the raw bio-aggregates as well as in relation to their behaviour when they are long-term incorporated in the MgO-cement environment is investigated. The differences in the thermal behaviour of the samples are explained by the changed structure of hemp hurds constituents due to the pre-treatment and long-term action of the alternative binder components on the bio-aggregates. Alkaline treatment increases thermal stability of hemp hurds compared to raw sample. Also long-term incorporation of hemp hurds in MgO-cement matrix had a similar effect in case of alkaline modified bio-aggregates. The more alkali ions present in the structure of hemp hurdssamples, the more ash is formed during their thermal decomposition studied by thermal gravimetry (TG) and differential scanning calorimetry (DSC).

Novel Thermally Stable Epoxy-polyurethane Composites: Preparation, Characterization

2011 ◽  
Vol 239-242 ◽  
pp. 2742-2747
Author(s):  
Jing Lin ◽  
Qiu Zhuan Yang ◽  
Xiu Fang Wen ◽  
Zhi Qi Cai ◽  
Pi Hui Pi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ring Opening ◽  
Thermal Characteristics ◽  
Ring Opening Reaction ◽  
Tetramethylammonium Bromide ◽  
One Step ◽  
Novolac Epoxy ◽  
Polyurethane Composites ◽  
Novolac Epoxy Resins ◽  
Thermal Stability Of

A novel series of hydroxyl terminated bisphenol-A type novolac epoxy resins modified with propionic acid (MEP) were prepared by one-step ring-opening reaction process in the presence of tetramethylammonium bromide catalyst. The obtained MEP was characterized using FTIR,1HNMR analyses. In addition, Intercross-linked epoxy-polyurethane composites networks were also obtained by curing reaction among MEP, cross linker polyisocyanate IL1351 and phthalic anhydride. The thermal characteristics of the epoxy-polyurethane composites were determined by thermogravimetric analysis (TGA). The thermal stability of the cured MEP with different ring-opening rate and cured alkyd polyol A450 were compared. The results showed that the obtained epoxy-polyurethane composites had much better thermal stability than the conventional polyurethane system A450/IL1351, and the thermal stability of them was correlated to the content of MEP.

Preparation and characterization of surface modified boron nitride epoxy composites with enhanced thermal conductivity

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44282-44290 ◽  
Author(s):  
Jun Hou ◽  
Guohua Li ◽  
Na Yang ◽  
Lili Qin ◽  
Maryam E. Grami ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Boron Nitride ◽  
High Thermal Conductivity ◽  
Epoxy Composites ◽  
Surface Modified ◽  
Enhanced Thermal Conductivity ◽  
Electrical Insulation Properties

The fabricated surface modified boron nitride epoxy composites exhibit high thermal conductivity, superior thermal stability and good mechanical properties while retaining good electrical insulation properties.

scholarly journals Valorization of Industrial Lignin as Biobased Carbon Source in Fire Retardant System for Polyamide 11 Blends

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 180 ◽  
Author(s):  
Neeraj Mandlekar ◽  
Aurélie Cayla ◽  
François Rault ◽  
Stéphane Giraud ◽  
Fabien Salaün ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Condensed Phase ◽  
Flame Retardants ◽  
Fire Behavior ◽  
Fire Retardant ◽  
Ternary Blends ◽  
Cone Calorimetry ◽  
Polyamide 11 ◽  
Twin Screw ◽  
Flame Retarded

In this study, two different types of industrial lignin (i.e., lignosulphonate lignin (LL) and kraft lignin (DL)) were exploited as charring agents with phosphorus-based flame retardants for polyamide 11 (PA11). The effect of lignins on the thermal stability and fire behavior of PA11 combined with phosphinate additives (namely, aluminum phosphinate (AlP) and zinc phosphinate (ZnP)) has been studied by thermogravimetric analysis (TGA), UL 94 vertical flame spread, and cone calorimetry tests. Various blends of flame retarded PA11 were prepared by melt process using a twin-screw extruder. Thermogravimetric analyses showed that the LL containing ternary blends are able to provide higher thermal stability, as well as a developed char residue. The decomposition of the phosphinates led to the formation of phosphate compounds in the condensed phase, which promotes the formation of a stable char. Flammability tests showed that LL/ZnP ternary blends were able to achieve self-extinction and V-1 classification; the other formulations showed a strong melt dripping and higher burning. In addition to this, cone calorimetry results showed that the most enhanced behavior was found when 10 wt % of LL and AlP were combined, which strongly reduced PHRR (−74%) and THR (−22%), due to the interaction between LL and AlP, which not only promotes char formation but also confers the stability to char in the condensed phase.

Morphology and Properties of Poly(Lactic Acid)/Ethylene-Octene Copolymer Blends with Different Organoclay Types

2020 ◽  
Vol 837 ◽  
pp. 174-180
Author(s):  
Sirirat Wacharawichanant ◽  
Attachai Sriwattana ◽  
Kulaya Yaisoon ◽  
Manop Phankokkruad
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Two Phase ◽  
Copolymer Blends ◽  
Ethylene Octene Copolymer ◽  
Surface Modified ◽  
Thermal Stability Of ◽  
Observation Results

This work studied the morphology, mechanical and thermal properties of poly (lactic acid) (PLA)/ethylene-octene copolymer (EOC) (80/20) blends with different organoclay types. Herein, EOC was introduced to toughening PLA by melt blending and organoclay was used to improve compatibility and tensile properties of the blends. The two organoclay types were nanoclay surface modified with aminopropyltriethoxysilane 0.5-5 wt% and octadecylamine 15-35% (Clay-ASO) and nanoclay surface modified with dimethyl dialkyl (C14-C18) amine 35-45 wt% (Clay-DDA). The organoclay contents were 3, 5 and 7 phr. Scanning electron microscope (SEM) observation results revealed PLA/EOC blends demonstrated a two-phase separation of dispersed EOC phase and PLA matrix phase. The addition of organoclay significantly improved the compatibility between PLA and EOC phases due to EOC droplet size decreased dominantly in PLA matrix, so organoclay could act as an effective compatibilizer. The incorporation of organoclay increased significantly tensile strength of PLA/EOC/organoclay composites while Young’s modulus increased with 5 phr of organoclay. The thermal stability of PLA/EOC blends did not change when compared with neat PLA, and when added Clay-ASO in the blends could improve the thermal stability of the PLA/EOC blends.

Properties of Fire Retardant Thermoplastic Vulcanizates from NR/PP Blends Filled with Aluminium Trihydrate and Magnesium Hydroxide with Reference to the Effect of Mixing Methods

2013 ◽  
Vol 844 ◽  
pp. 297-300 ◽  
Author(s):  
Alif Walong ◽  
Azizon Kaesaman ◽  
Tadamoto Sakai ◽  
Natinee Lopattananon
Keyword(s):  
Thermal Stability ◽  
Magnesium Hydroxide ◽  
Fire Retardant ◽  
Melt Mixing ◽  
Dynamic Vulcanization ◽  
Elongation At Break ◽  
Processing Cost ◽  
Fire Retardant Properties ◽  
Pp Blends ◽  
Internal Mixer

Blends of natural rubber (NR) and polypropylene (PP) with composition of 60/40 %wt were prepared by using an internal mixer to obtain thermoplastic vulcanizate (TPV). Aluminium trihydrate (ATH) and magnesium hydroxide (MH) were used as fillers to improve thermal stability and fire retardant properties. Three different mixing methods were used to incorporate the fillers into the TPVs, which were (1) compounding of NR and filler followed by dynamic vulcanization of NR during blending with PP, (2) compounding of NR with a half part of filler (and oil) followed by dynamic vulcanization of NR when blending with PP before adding another half part of filler into the blend (3) melt mixing of PP, NR and filler followed by dynamic vulcanization during mixing. The incorporation of ATH and MH decreased tensile strength and elongation at break of the TPVs, but increased the thermal stability and LOI%. From this work, the mixing of filler with NR/PP blend by using method 3 provided better balance of tensile, thermal and fire resistant properties and processing cost reduction.

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