Synthesis and Thermal Properties of a Boron-Containing Bisphenol-S Formaldehyde Resin

2011 ◽  
Vol 239-242 ◽  
pp. 2905-2908 ◽  
Author(s):  
Jun Gang Gao ◽  
Wei Hong Wu ◽  
Xing Li
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Thermal Properties ◽  
Degradation Rate ◽  
Formaldehyde Resin ◽  
Curing Process ◽  
Bisphenol S ◽  
Coordinate Structure ◽  
H Nmr ◽  
Degradation Temperature

Boron-containing bisphenol-S formaldehyde resin (BBPSFR) was synthesized by formalin method. The structure and thermal properties of BBPSFR were characterized by 1H NMR, FTIR, torsional braid analysis (TBA) and thermogravimetric analysis (TGA), respectively. The results showed that the borate had formed, and the six-member ring containing boron-oxygen coordinate structure also formed during the curing process. The glass transition temperature (Tg) of BBPSFR is higher 104°C than that of bisphenol-S formaldehyde resins (BPSFR); the initial degradation temperature (Ti ) increases about 43°C; thermal degradation rate decrease and thermal stability increase significantly.

Synthesis of Carbazoled Poly(Arylene Imino)

2011 ◽  
Vol 284-286 ◽  
pp. 1863-1866 ◽  
Author(s):  
Wen Wen Shan ◽  
Guan Jun Chang ◽  
Fang Hua Zhu ◽  
Lin Zhang
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Glass Transition ◽  
Thermal Properties ◽  
High Glass Transition Temperature ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Result Show ◽  
Palladium Catalyzed ◽  
Ft Ir

The carbazoled poly(arylene imino)s (c-PAI) have been synthesized via palladium-catalyzed polycondensation of 3,6-diamino-N-(2-ethylhexyl)carbazole with different aromatic dibromides. The structure of c-PAI were characterized by means of FT-IR, 1H NMR spectroscopy and elemental analysis, the results show an agreement with the proposed structure. The thermal properties of c-PAI were detected by DSC and TG. The result show that the polymers possess high glass transition temperature (Tg＞250°C ), good thermal stability with high decomposition temperatures (TD＞410°C), In addition to the thermal properties, the optical properties were studied, including Uv-vis absorption, photoluminescence and time of flight (TOF).

Synthesis and characterization of novel benzoxazines containing nitrile and allyl groups and their polymers

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Hongchun Zhang ◽  
Zaijun Lu
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Ring Opening ◽  
Synthesis And Characterization ◽  
Curing Process ◽  
Oxazine Ring ◽  
Thermal Stability Of

AbstractA p-cyanophenol and allylamine based benzoxazine has been synthesized and characterized. This benzoxazine has nitrile and allyl functionalities that can polymerize, resulting in a highly crosslinked material. The DSC spectra of novel benzoxazine monomer reveal that incorporation of the nitrile and allyl group greatly decreases the ring-opening temperature of oxazine rings (140°C). The IR spectra of curing process indicate that the polymerization of oxazine ring accompany with the curing reaction of allyl and nitrile groups. Benzoxazine monomers with one or none of the two functionalities were also prepared to study structure effect on thermal properties of resulted polymer. The comparison of results confirms that introducing the two functionalities improved glass transition temperature (238 °C), thermal stability of polybenzoxazine (T5%=340 °C), and char yield (57%).

scholarly journals The Influence of Substituents in Phosphazene Catalyst-Flame Retardant on the Thermochemistry of Benzoxazine Curing

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3111
Author(s):  
Natalia V. Bornosuz ◽  
Roman F. Korotkov ◽  
Alexander A. Kolenchenko ◽  
Alexey V. Shapagin ◽  
Alexey V. Orlov ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Curing Process ◽  
Flame Resistance ◽  
Dispersion Phase ◽  
Thermal Stability Of ◽  
Influence Of Substituents

This work is devoted to the influence of phosphazene modifiers with different substituents on the curing process, thermal properties and flammability of benzoxazine resin. Novel catalysts with m-toluidine substituents were introduced. The catalytic activity of studied phosphazene compounds decreased in the row: hexachlorocyclotriphosphazene (HCP) > tetra m-toluidine substituted phosphazene PN-mt (4) > hexa m-toluidine substituted phosphazene PN-mt (6) > hexaphenoxycyclotriphosphazene (HPP), where HPP is totally inactive. Two types of catalysis: basic and acid were proposed. A brief study of resulting properties of polybenzoxazines was presented. The addition of any studied modifier caused the decrease of glass transition temperature and thermal stability of polymers. The morphology of cured compositions was characterized by matrix-dispersion phase structure. All phosphazene containing polybenzoxazines demonstrated the improved flame resistance.

scholarly journals Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

2019 ◽  
Vol 17 (1) ◽  
pp. 1080-1086
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Boric Acid ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
H Nmr ◽  
Maldi Tof ◽  
Instrumental Methods

AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

Study on Glass Transition Temperature of Polyvinylamine Hydrochloride

2011 ◽  
Vol 217-218 ◽  
pp. 1066-1069 ◽  
Author(s):  
Hong Chi Zhao ◽  
Qi Li ◽  
Li Bin Bai ◽  
Fan Huang
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Differential Scanning Calorimeter ◽  
Degradation Rate ◽  
Average Molecular Weight ◽  
Weight Average Molecular Weight ◽  
Dsc Curves

Polyvinylamine (PVAm) was synthesized by Hofmann degradation of polyacrylamide (PAM). The thermal properties of the Polyvinylamine hydrochloride (PVAm•HCl) were studied by differential scanning calorimeter (DSC). The degradation rate (a) decreased with increasing weight-average molecular weight (Mw) of PAM and decreasing amount of NaOH, and a were the better values when the concentration of PAM was 5% and the amount of NaClO was 10 mL. DSC curves showed that the glass transition temperature (Tg) of PVAm•HCl increased with increasing Mw of PAM, concentration of NaClO and decreasing concentration of NaOH. Tg of PVAm•HCl appeared the minimum value when the concentration of PAM was 5.0%.

Thermal Properties of Acrylic Resin Denture Base Material Containing Silver Nanoparticle Synthesized from Aqueous Extract of Boesenbergia rotunda

2018 ◽  
Vol 777 ◽  
pp. 173-177
Author(s):  
Panjaporn Wongwitthayakool ◽  
Matsayapan Pudla
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Base Material ◽  
Acrylic Resin ◽  
Denture Base ◽  
Acrylic Resins ◽  
Thermal Stability Of

Silver nanoparticles (AgNPs) were synthesized by bioreduction method using aqueous extracts of Boesenbergia rotunda as reducing and stabilizing agents. Ultraviolet-Visible (UV-Vis) spectrophotometer was utilized to monitor the qualitative formation of AgNPs. The UV-Vis spectrum showed that the spherical AgNPs with diameter of 20-40 nm were formed. The antifugal activity of synthesized AgNPs was investigated using Candida albicans, which was found that the synthesized AgNPs could be used as effective growth inhibitors. The influence of the incorporation of prepared AgNPs on thermal properties of the acrylic denture base material was investigated. Glass transition temperature of filled acrylic resins was studied using the dynamic mechanical analyzer (DMA). The temperature sweeps were performed with tension mode. Thermogravimetry analysis (TGA) was used to examine effect of AgNP concentration and thermocycling (1250, 2500, 5000, and 10000 cycles) on thermal stability of AgNP filled acrylic resin denture base materials. Glass transition temperature (Tg) of the acrylic resins slightly increase with increasing AgNP contents. TGA results indicated that AgNP retarded thermal degradation of acrylic resin denture material, and thermocycling did not affect thermal stability of AgNP filled acrylic resin denture material.

Research on Hybrid UV-Curing G-POSS/Epoxy Resin /Unsaturated Polyester Insulation Nanocomposites

2013 ◽  
Vol 380-384 ◽  
pp. 4344-4347
Author(s):  
Jun Gang Gao ◽  
Gui Xiang Hou
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Electrical Resistivity ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Cationic Polymerization ◽  
Unsaturated Polyester ◽  
Uv Curing ◽  
Curing Process ◽  
Polyhedral Oligomeric Silsesquioxanes

Polyhedral oligomeric silsesquioxanes epoxy resin (G-POSS) was prepared from 2,3-glycidyloxypropyl-trimethoxysilane (GTMS) by hydrolytic condensation. Thermal properties and electrical properties and UV-curing gel rate of G-POSS/epoxy resin (ER)/unsaturated polyester (UP) nanocomposites using diphenyliodide hexafluorophosphate (DPI·PF6) as initiator of curing reaction were investigated. The results showed that curing process of G-POSS/ER/UP is the double hybrid free radical/cationic polymerization. The gel rate of all the samples is more than 90%. G-POSS would decrease the electrical resistivity and increases the dielectric constant of the complex curing materials. Thermal stability is increased with the addition of G-POSS.

Radiopaque acrylic bone cement with bromine-containing acrylic monomer. II

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Marius Ciprian Rusu ◽  
Ionut Cameliu Ichim ◽  
Marcel Popa ◽  
Daniela Rusu ◽  
Mihai Rusu
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Bone Cement ◽  
Setting Time ◽  
Maximum Temperature ◽  
Acrylic Bone Cement ◽  
Compression Tests

AbstractBromine-containing methacrylate, 2-(2-bromoisobutyryloxy) ethyl methacrylate (BIEM), had been used in the formulation of acrylic radiopaque cements. The effect of this monomer incorporated into the liquid phase of acrylic bone cement (ABC), on the curing parameters, thermal properties, water absorption, density, compression tests and radiopacity was studied. A decrease of maximum temperature and an increase of the setting time were observed with the addition of the brominecontaining monomer in the radiolucent cement composition. Adding BIEM in radiolucent ABCs composition results in the decrease of glass transition temperature and increase in its thermal stability. The ABCs modified with bromine-containing comonomer are characterized by polymerization shrinkage lower than the radiolucent cement. Addition of bromine-containing comonomer in radiolucent ABC composition determines the increase of compressive strength. The ABCs modified with brominecontaining comonomer proved to be radiopaque.

Effects of graphene on thermal properties and thermal stability of polycarbonate/graphene nanocomposite

2021 ◽  
pp. 089270572199788
Author(s):  
Md Amir Sohel ◽  
Abhijit Mondal ◽  
P Mohammad Arif ◽  
Sabu Thomas ◽  
Asmita SenGupta
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Multilayer Graphene ◽  
Melt Mixing ◽  
Graphene Nanocomposite ◽  
Thermal Stability Of

Polycarbonate (PC) /graphene nanocomposite was prepared using multilayer graphene (MLG) with loadings of 0.5, 1, and 3 wt% via melt mixing process. Morphological, structural, and thermal properties of the PC/MLG nanocomposites are investigated to look into the influence of MLG on the nanocomposite. A significant increase (∼6.4°C) in glass transition temperature is observed upon the addition of 3 wt% of MLG into the polycarbonate matrix. This increase in glass transition temperature may be due to the interaction between the MLG and polycarbonate polymer matrix. The specific heat capacity of pure PC and PC/MLG nanocomposites varies linearly with temperature below their glass transition. Upon the addition of MLGs, the overall thermal stability of PC/MLG nanocomposites increases with MLG loadings. A maximum increase about 29.23°C in T onset of thermal decomposition is observed in PC/MLG nanocomposite having 3 wt% of MLG loading. The activation energy ( Ea) of thermal decomposition is also calculated by kinetic analysis of thermal decomposition of the PC/MLG nanocomposites using Horowitz–Metzger and Broido’s methods.

scholarly journals Thermal Characterization of Non-Functionalized Low Content Graphene Nanoplatelets (GNP) Added Nylon 66 Polymer

2021 ◽  
Vol 89 (1) ◽  
pp. 13-25
Author(s):  
Mohammed Iqbal Shueb ◽  
Mohd Edeerozey Abd Manaf ◽  
Mahathir Mohamed ◽  
Noraiham Mohamad ◽  
Jeeferie Abd Razak ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Thermal Characterization ◽  
Mechanical Analysis ◽  
Graphene Nanoplatelets ◽  
Degree Of Crystallinity ◽  
Minimal Amount ◽  
Nylon 66 ◽  
Degradation Temperature ◽  
Tan Δ

Thermal behaviour of graphene nanoplatelets (GNP) reinforced nylon 66 nanocomposites were investigated using differential calorimetric scanning (DSC), thermogravimetric analyzer (TGA) and dynamic mechanical analysis (DMA). The influence of low content GNP on thermal properties of GNP/nylon 66 nanocomposites was studied for low GNP content (0.3, 0.5 and 1.0 wt%). DSC results indicate that addition of GNP increases crystallization temperature and degree of crystallinity of the nanocomposites. Thermal stability and mass loss were studied through TGA analysis. The results show that thermal stability and weight loss of GNP/nylon 66 nanocomposites slightly improve with the GNP addition with an increase in the onset of degradation temperature as much as 10 °C. DMA analysis shows that GNP in the nylon 66 matrix act similar to plasticizer; it decreases the storage modulus and glass transition temperatures of the nanocomposites. GNP addition also reduces tan δ indicating an improvement in the damping property of the nanocomposites. Overall, this study concludes that a minimal amount of 0.3 wt% of GNP is effective in improving the thermal properties of nylon 66 composites.

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