Thermal and Fire Behavior of a Bio-Based Epoxy/Silica Hybrid Cured with Methyl Nadic Anhydride

thermosetting polymers have been widely used in various industrial applications as adhesives, coatings and laminated materials, among others. More recently, bisphenol A (BPA) have been banned as a raw material polymer product, because the harmful effects on human health. On the other hand, the use of aromatic amines as curing agents confer the properties of heat resistance, mechanical and fire very well for the final product, even though they are toxic and are subject to government restrictions. In this context, diepoxy monomer anhydride derived sugar and green represent a sustainable alternative to BPA and aromatic amines. Here, we report the “in-situ” sol-gel synthesis, using as a precursor tetraethylorthosilicate (TEOS) and aminopropyl triethoxysilane (APTS) to obtain bio-based epoxy / silica composite;

The first step, APTS is left to react with 2,5-bis [(oxyran-2-ylmethoxy) methyl] furan (BOMF) or diglycidyl ether of bisphenol A (DGEBA) monomer, and the resulting silica particles in epoxy in a second step ; The second system nadic cured with methyl anhydride (MNA). composite morphology investigation through a transmission electron microscope (TEM) showed that the hybrid strategy enables excellent distribution of silica nanoparticles (at the nanometric level) to be achieved in a hybrid network structure for the second diepoxy monomer. Regarding the behavior of the fire, as assessed in a vertical flame spread test, the use of preservatives prevented anhydride melt dripping phenomenon and provide high char-forming character to the bio-based epoxy systems and analog phenyl them.

In addition, forced combustion tests showed that the use of anhydride hardener is not the result of an aliphatic polyamine remarkable decline of the rate of heat release. An overall decline of smoke parameters, which is highly desirable in the context of a larger fire safety observed in the case of system BOMF / MNA. The experimental results show that the effect of silica nanoparticles on the fire behavior seems to be related to the level of their dispersion.

 Thermal and Fire Behavior of a Bio-Based Epoxy/Silica Hybrid Cured with Methyl Nadic Anhydride
Thermal and Fire Behavior of a Bio-Based Epoxy/Silica Hybrid Cured with Methyl Nadic Anhydride

methacrylate perspective in the current dental practices

Objective: To provide a current perspective on the sensitivity of dental personnel with methacrylate materials.


Overview: Methacrylate related sensitivities and allergies today goes beyond traditional thinking about denture base resins and materials while methyl methacrylate. Methacrylate now ubiquitous in the current dental practice and dental personnel should be aware that dental adhesives contain potent sensitizer may also be cross-sensitization to methacrylates individuals did not experience. Sensitivity grow to 2-hydroxyethyl methacrylate (HEMA) has described an epidemic in nature because the industry of artificial nails with dental patients and dental personnel may be more susceptible to tooth methacrylate sensitization.

While contact dermatitis remains the most common clinical presentation related methacrylate, respiratory complications and asthma increase is associated with exposure to methacrylates. While additional personal protective equipment (PPE) is expected to be the first protective choice, the National Institute for Occupational Safety and Health (NIOSH) considers the overall PPE largely ineffective and should be considered only as a last resort.


Conclusion: Dental personnel must be aware of the source of methacrylate and control measures limit the use of workplace exposure to second methacrylate dental personnel and patients.

EOSIN METHYLENE BLUE AGAR

E05-102-500g 500 g
EUR 108

EOSIN METHYLENE BLUE AGAR,LEVINE

E05-103-10kg 10 kg
EUR 1035

EOSIN METHYLENE BLUE AGAR,LEVINE

E05-103-2kg 2kg
EUR 264

EOSIN METHYLENE BLUE AGAR,LEVINE

E05-103-500g 500 g
EUR 108

ETHYL VIOLET AZIDE BROTH

E05-105-10kg 10 kg
EUR 1302

ETHYL VIOLET AZIDE BROTH

E05-105-2kg 2kg
EUR 322

ETHYL VIOLET AZIDE BROTH

E05-105-500g 500 g
EUR 124

EUGONIC AGAR

E05-106-10kg 10 kg Ask for price

EUGONIC AGAR

E05-106-2Kg 2 Kg Ask for price

EUGONIC AGAR

E05-106-500g 500 g Ask for price

ENDO AGAR

E05-110-10kg 10 kg
EUR 2381

ENDO AGAR

E05-110-2Kg 2 Kg
EUR 557

ENDO AGAR

E05-110-500g 500 g
EUR 188

APT AGAR

A01-101-10kg 10 kg
EUR 1173

APT AGAR

A01-101-2Kg 2 Kg
EUR 294

APT AGAR

A01-101-500g 500 g
EUR 116

AGAR, BACTERIOLOGICAL

A01-102-10kg 10 kg
EUR 1684

AGAR, BACTERIOLOGICAL

A01-102-2kg 2kg
EUR 405

AGAR, BACTERIOLOGICAL

A01-102-500g 500 g
EUR 146

AGAR, HIGH GEL

A01-102IHG-10kg 10 kg
EUR 2219

AGAR, HIGH GEL

A01-102IHG-2Kg 2 Kg
EUR 521

AGAR, HIGH GEL

A01-102IHG-500g 500 g
EUR 178

AGAR,NOBLE

A01-102N-10kg 10 kg
EUR 3910

AGAR,NOBLE

A01-102N-2kg 2kg
EUR 889

AGAR,NOBLE

A01-102N-500g 500 g
EUR 278

ALT. THIOGLYCOLLATE MED.

A01-103-10kg 10 kg Ask for price

ALT. THIOGLYCOLLATE MED.

A01-103-2Kg 2 Kg Ask for price

ALT. THIOGLYCOLLATE MED.

A01-103-500g 500 g Ask for price

AMIES BROTH WITH CHARCOAL

A01-104-10kg 10 kg Ask for price

AMIES BROTH WITH CHARCOAL

A01-104-2kg 2kg Ask for price

AMIES BROTH WITH CHARCOAL

A01-104-500g 500 g Ask for price

AMIES BROTH W/O CHARCOAL

A01-105-10kg 10 kg Ask for price

AMIES BROTH W/O CHARCOAL

A01-105-2Kg 2 Kg Ask for price

AMIES BROTH W/O CHARCOAL

A01-105-500g 500 g Ask for price

AZIDE BLOOD AGAR BASE

A01-113-10kg 10 kg
EUR 2532

AZIDE BLOOD AGAR BASE

A01-113-2kg 2kg
EUR 589

AZIDE BLOOD AGAR BASE

A01-113-500g 500 g
EUR 197

AZIDE DEXTROSE BROTH

A01-114-10kg 10 kg
EUR 868

AZIDE DEXTROSE BROTH

A01-114-2Kg 2 Kg
EUR 228

AZIDE DEXTROSE BROTH

A01-114-500g 500 g
EUR 98

ANAEROBIC AGAR

A01-115-10kg 10 kg
EUR 2556

ANAEROBIC AGAR

A01-115-2kg 2kg
EUR 595

ANAEROBIC AGAR

A01-115-500g 500 g
EUR 198

A-1 MEDIUM

A01-116-10kg 10 kg
EUR 1034

A-1 MEDIUM

A01-116-2Kg 2 Kg
EUR 264

A-1 MEDIUM

A01-116-500g 500 g
EUR 108

AGAROSE 25G-125G -500G

A01-118-10kg 10 kg Ask for price

AGAROSE 25G-125G -500G

A01-118-2kg 2kg Ask for price

AGAROSE 25G-125G -500G

A01-118-500g 500 g
EUR 494

IL-2 Receptor ?, Human Recombinant

7100-10
EUR 196

IL-2 Receptor ?, Human Recombinant

7100-50
EUR 637

Human CellExp? IL-4 R?, Human Recombinant

7101-10
EUR 229

Human CellExp? IL-4 R?, Human Recombinant

7101-50
EUR 881

Human CellExp? IL-6 R?, Human Recombinant

7102-10
EUR 207

Human CellExp? IL-6 R?, Human Recombinant

7102-50
EUR 800

IL-9, Rat Recombinant

7103-10
EUR 278

IL-9, Rat Recombinant

7103-50
EUR 1132

IL-12p80, Human Recombinant

7104-10
EUR 392

IL-12p80, Human Recombinant

7104-50
EUR 1675

IL-17A, Mouse Recombinant

7105-10
EUR 196

IL-17A, Mouse Recombinant

7105-50
EUR 675

IL-17B, Human Recombinant

7106-10
EUR 196

IL-17B, Human Recombinant

7106-50
EUR 675

IL-17D, Human Recombinant

7107-10
EUR 196

IL-17D, Human Recombinant

7107-50
EUR 675

Human CellExp? IL-34, Human Recombinant

7108-10
EUR 278

Human CellExp? IL-34, Human Recombinant

7108-50
EUR 1132

IL-36RA, Human Recombinant

7109-10
EUR 196

IL-36RA, Human Recombinant

7109-50
EUR 675

IL-36?, Human Recombinant

7110-10
EUR 278

IL-36?, Human Recombinant

7110-50
EUR 1132

IL-36?, Human Recombinant

7111-10
EUR 278

IL-36?, Human Recombinant

7111-50
EUR 1132

Activin B, Human Recombinant

7112-10
EUR 479

Activin B, Human Recombinant

7112-50
EUR 2094

AITRL, Human Recombinant

7113-10
EUR 251

AITRL, Human Recombinant

7113-50
EUR 936

Amphiregulin, Human Recombinant

7114-10
EUR 147

Amphiregulin, Human Recombinant

7114-50
EUR 376

ANG-1, Human Recombinant

7115-10
EUR 251

ANG-1, Human Recombinant

7115-50
EUR 936

ANG-2, Human Recombinant

7116-10
EUR 251

ANG-2, Human Recombinant

7116-50
EUR 936

APRIL, Human Recombinant

7117-10
EUR 311

APRIL, Human Recombinant

7117-50
EUR 1300

APRIL, Mouse Recombinant

7118-10
EUR 196

APRIL, Mouse Recombinant

7118-50
EUR 675

Betacellulin, Murine Recombinant

7119-10
EUR 196

Betacellulin, Murine Recombinant

7119-50
EUR 675

Cardiotrophin-1, Murine Recombinant

7121-10
EUR 278

Cardiotrophin-1, Murine Recombinant

7121-50
EUR 1132

sCD100/Semaphorin-4D, Human Recombinant

7126-10
EUR 251

sCD100/Semaphorin-4D, Human Recombinant

7126-50
EUR 936

CTGFL/WISP-2, Human Recombinant

7129-10
EUR 234

CTGFL/WISP-2, Human Recombinant

7129-50
EUR 860

Human CellExp? DKK-1, Human Recombinant

7132-10
EUR 278

Human CellExp? DKK-1, Human Recombinant

7132-50
EUR 1132

Human CellExp? sDLL-1, Human Recombinant

7133-10
EUR 207

Human CellExp? sDLL-1, Human Recombinant

7133-50
EUR 675

Human CellExp? sDLL-4, Human Recombinant

7134-10
EUR 207

Human CellExp? sDLL-4, Human Recombinant

7134-50
EUR 675

Eotaxin-2/CCL24, murine recombinant

7137-10
EUR 207

Eotaxin-2/CCL24, murine recombinant

7137-50
EUR 675

Eotaxin-3/CCL26, human recombinant

7138-10
EUR 207

Eotaxin-3/CCL26, human recombinant

7138-50
EUR 675

Human CellExp? Fetuin A/ASHG, Human Recombinant

7142-10
EUR 153

Human CellExp? Fetuin A/ASHG, Human Recombinant

7142-50
EUR 381

Histone H3 Peptide, biotin conjugate

7143-01
EUR 240

Histone H3 Peptide, biotin conjugate

7143-1
EUR 1132

Histone H4 Peptide, tetra-acetylated, biotin conjugate

7144-01
EUR 240

Histone H4 Peptide, tetra-acetylated, biotin conjugate

7144-1
EUR 1132

FGF-5, human recombinant

7147-10
EUR 142

FGF-5, human recombinant

7147-50
EUR 359

FGF-6, human recombinant

7148-10
EUR 207

FGF-6, human recombinant

7148-50
EUR 675

FGF-16, human recombinant

7149-10
EUR 207

FGF-16, human recombinant

7149-50
EUR 675

FGF-17, human recombinant

7150-10
EUR 207

FGF-17, human recombinant

7150-50
EUR 675

FGF-23, human recombinant

7151-10
EUR 229

FGF-23, human recombinant

7151-50
EUR 860

GASP-1, human recombinant

7152-10
EUR 229

GASP-1, human recombinant

7152-50
EUR 833

GCP-2 (CXCL6), human recombinant

7153-10
EUR 207

GCP-2 (CXCL6), human recombinant

7153-50
EUR 675

BMP-9/GDF-2, human recombinant

7154-10
EUR 278

BMP-9/GDF-2, human recombinant

7154-50
EUR 1132

BMP-11/GDF-11, human recombinant

7155-10
EUR 240

BMP-11/GDF-11, human recombinant

7155-50
EUR 860

Gremlin-1, human recombinant

7159-10
EUR 142

Gremlin-1, human recombinant

7159-50
EUR 359

ICAM-1, human recombinant

7161-10
EUR 142

ICAM-1, human recombinant

7161-50
EUR 359

IFN-?1, human recombinant

7162-10
EUR 207

IFN-?1, human recombinant

7162-50
EUR 735

IFN-?2, human recombinant

7163-10
EUR 207

IFN-?2, human recombinant

7163-50
EUR 675

IGF-BP2, human recombinant

7165-10
EUR 251

IGF-BP2, human recombinant

7165-50
EUR 936

IGF-BP4, human recombinant

7166-10
EUR 251

IGF-BP4, human recombinant

7166-50
EUR 936

IGF-BP7, human recombinant

7167-10
EUR 207

IGF-BP7, human recombinant

7167-50
EUR 675

MCP-5/CCL12, murine recombinant

7168-10
EUR 207

MCP-5/CCL12, murine recombinant

7168-50
EUR 675

MIP-1?/CCL3, human recombinant

7173-10
EUR 207

MIP-1?/CCL3, human recombinant

7173-50
EUR 675

MIP-1?/CCL9/10, murine recombinant

7174-10
EUR 207

MIP-1?/CCL9/10, murine recombinant

7174-50
EUR 675

MIP-3/CCL23, human recombinant

7175-10
EUR 207

MIP-3/CCL23, human recombinant

7175-50
EUR 675

Nesfatin-1, human recombinant

7178-10
EUR 137

Nesfatin-1, human recombinant

7178-50
EUR 272

Human CellExp? PECAM-1, Human Recombinant

7184-10
EUR 153

Human CellExp? PECAM-1, Human Recombinant

7184-50
EUR 381

PF-4/CXCL4, murine recombinant

7187-10
EUR 207

PF-4/CXCL4, murine recombinant

7187-50
EUR 675

R-Spondin-1, human recombinant

7189-10
EUR 207

R-Spondin-1, human recombinant

7189-50
EUR 675

R-Spondin-2, human recombinant

7190-10
EUR 207

R-Spondin-2, human recombinant

7190-50
EUR 675

R-Spondin-3, human recombinant

7191-10
EUR 207

R-Spondin-3, human recombinant

7191-50
EUR 675

Relaxin-2, human recombinant

7194-10
EUR 207

Relaxin-2, human recombinant

7194-50
EUR 675

Relaxin-3, human recombinant

7195-10
EUR 207

Relaxin-3, human recombinant

7195-50
EUR 675

SDF-1?/CXCL2, rat recombinant

7199-10
EUR 207

SDF-1?/CXCL2, rat recombinant

7199-50
EUR 675

SDF-1?/CXCL2, rat recombinant

7200-10
EUR 207

SDF-1?/CXCL2, rat recombinant

7200-50
EUR 675

Semaphorin 3A, human recombinant

7201-10
EUR 207

Semaphorin 3A, human recombinant

7201-50
EUR 675

sTRAIL Receptor-1/DR4, human recombinant

7206-10
EUR 153

sTRAIL Receptor-1/DR4, human recombinant

7206-50
EUR 381

VAP-1, human recombinant

7210-10
EUR 321

VAP-1, human recombinant

7210-50
EUR 1186

Human CellExp? VCAM-1, Human Recombinant

7211-10
EUR 142

Human CellExp? VCAM-1, Human Recombinant

7211-50
EUR 381

TAFA-2, human recombinant

7213-10
EUR 207

TAFA-2, human recombinant

7213-50
EUR 675

Thymosin-?4, human recombinant

7216-10
EUR 131

Thymosin-?4, human recombinant

7216-50
EUR 272

TL-1A, human recombinant

7219-10
EUR 207


Clinical significance: Sensitization to material workplace methacrylate is a major concern grows teeth and dental personnel should be aware of both the content of methacrylic current materials and products that contain ingredients with the most potential for sensitization.