HYBRID CHEMICAL SENSOR, AND, SENSITIVE POLYMERIC COMPOSITION

• US 20120009687A1
• Filed: 06/22/2009
• Published: 01/12/2012
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Braskem SA, Universidade Federal Do Rio Grande Do Sul.
• Original Assignee: Braskem SA, Universidade Federal Do Rio Grande Do Sul.
• Inventors: Acevedo, Edwin Moncada, Pires, Gilvan Pozzobon, Dos Santos, João Henrique Zimnoch
• Granted Patent: US 9,063,111 B2
• Time in Patent Office: Days
• US Class Current: 436/113
• CPC Class Codes: G01N 31/221 for investigating pH value
• CPC Class Codes: Y10T 436/17 Nitrogen containing
• CPC Class Codes: Y10T 436/173845 Amine and quaternary ammonium
• CPC Class Codes: Y10T 436/175383 Ammonia

Abstract

The present invention relates to chemical sensors with hybrid characteristics, which are thermo-mechanically stable and able to respond to changes in the environment, particularly in the presence of amine and/or amide and/or oxide-reducing compounds, and/or vapor thereof by color change, as well as its incorporation into sensitive polymeric composition.

Claims

1. A hybrid chemical sensor comprising a sensitive compound encapsulated by a hybrid capsule obtained by sol-gel reaction, said hybrid capsule using siliceous andor titanium alkoxides, wherein at least one of said alcoxides is substituted with one or more alkyl chains.

2. The hybrid chemical sensor according to claim 1, wherein the hybrid capsule is compatible with thermoplastic or thermosetting organic polymer.

3. The hybrid chemical sensor according to claim 1, wherein the hybrid capsule is stable up to a temperature of 300°

C. and it endures the shear stress generated in standard extruders.

4. The hybrid chemical sensor according to claim 1, wherein it produces a color change in the presence of amine and/or amide and/or oxide-reducing compounds, and/or vapor thereof

5. The hybrid chemical sensor according to claim 1, wherein said siliceous alkoxides are selected from tetraethoxysilane (TEOS), ethyltrimethoxysilane (ETMS), methyltrimethoxysilane (MTMS), phenyltrimethoxysilane (PTMS), n-octylethoxysilane, or n-butylethoxysilane.

6. The hybrid chemical sensor according to claim 1, wherein said titanium alkoxides are selected from tetraethoxytitanium, ethyltriethoxytitanium, methyltriethoxytitanium, phenyltriethoxytitanium, n-octylethoxytitanium, or n-butylethoxytitanium.

7. The hybrid chemical sensor according to claim 1, wherein the hybrid chemical sensor presents a spherical, fibrillary, laminar or amorphous morphology.

8. A sensitive polymeric composition comprising the hybrid chemical sensor as defined in claim 1.

9. The sensitive polymeric composition according to claim 8, wherein it is made of thermoplastic or thermosetting organic polymers, especially polyolefins of the type Polyethylene (PE) and/or Polypropylene (PP) and/or Vinyl Polychloridc (PVC) and/or blends or composites of these polymers.

10. The sensitive polymeric composition according to claim 8, wherein it produces a color change in the presence of amine and/or amide and/or oxide-reducing compounds, and/or vapor thereof.