Navigation Links
Polymer Degradation Mechanisms Encountered in Pyrolysis-GC/MS

Author:
Thomas Wampler

CDS Analytical, Inc.
465 Limestone Road
Oxford, PA 19363-0277

Introduction

The use of analytical pyrolysis1 with gas chromatography/ mass spectrometry (GC/MS) to study the structure of polymeric material must be based on an understanding of how these large molecules behave at elevated temperatures. The utility of the technique is based on the application of thermal energy to produce volatile fragments and products from a macromolecule compounds capable of being analyzed using GC/MS. The production of these analytes must, of course, be reproducible and follow chemical principles which permit the interpretation of results applied to unknown polymers.

Whether the sample represents evidence in a forensic lab, quality-control materials in the paint, adhesives, rubber or polymer industries or an unknown material for product comparison, the original polymeric structure is revealed in the compounds present in the chromatogram. The presence or absence of specific peaks in the pyrogram not only differentiates one sample from another, but may be crucial in identifying defects related to product performance. Understanding how these peaks are produced from the polymer is important in weighing the significance of the data and essential in identifying unknown materials, whether it is contamination in industrial processes, competitors products or evidence from a crime scene.

In general, the degradation mechanisms experienced by polymers are free-radical processes initiated by bond dissociation at the pyrolysis temperature. The specific pathway followed by a particular polymer is related to the relative strength of the polymer bonds and the structure of the polymer chain. These mechanisms are generally grouped into three categories: random scission, unzipping and side-group elimination.
'"/>

Source:


Page: All 1 2 3 4

Related biology technology :

1. Novel PCR Enhancing Factor Improves Performance of Pfu DNA Polymerase
2. Pfu DNA Polymerase as a Hot Start Alternative
3. PCR Performance Comparisons Between pfuturbo and Taq DNA Polymerases
4. pfuturbo DNA Polymerase: A High-Performance, High-Fidelity Enzyme Ideal for PCR Cloning
5. Unique DNA Polymerase Formulation Excels in a Broad Range of PCR Applications
6. Enhanced Amplification of Long Targets with PfuTurbo DNA Polymerase
7. High-Fidelity PCR with a Novel Polymerase Mixture
8. Optimizing pfuturbo DNA Polymerase Amplification Reactions with Perfect Match PCR Enhancer
9. Unique Enhanced DNA Polymerase Delivers High Fidelity and Great PCR Performance
10. The Use of MasterTaq Polymerase for PCR with Humic Material-Contaminated DNA
11. HotStarTaq DNA Polymerase
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Polymer Degradation Mechanisms Encountered Pyrolysis

(Date:3/30/2015)... (PRWEB) March 29, 2015 A two-day ... United States and plenary talks by four leading photonics ... Optics + Optoelectronics next month in Prague, Czech ... in 17 conferences alongside a two-day exhibition. Sponsored by ... , the event will run 13-16 April in the ...
(Date:3/30/2015)... 2015 Richmond Pharmacology nimmt ... Pharmacology ist das erste Zentrum weltweit, das in ... Hospital in London in ... Studienversuche an einem Patienten begonnen hat. Das Therapeutikum ... entwickelt (ATTR), einer seltenen Herz- und Nervenkrankheit. ...
(Date:3/29/2015)... , March 29, 2015  Caris ... study data in small cell cervical cancer ... Caris Molecular Intelligence®, the company,s panomic, comprehensive ... gene mutations which may explain sensitivities and ... that identification of certain biomarkers may guide ...
(Date:3/27/2015)... Earlier this year, the Capillus272Pro™ received ... in adult men and women with androgenic alopecia (AGA) ... of IIa-V and Fitzpatrick Classification of Skin phototypes I-IV. ... over-promise and under-deliver, FDA Clearance underscores the safety and ... more than 80 million men and women who suffer ...
Breaking Biology Technology:Laser Energy Advances Among Reports Set for SPIE Optics + Optoelectronics 2Laser Energy Advances Among Reports Set for SPIE Optics + Optoelectronics 3Study Using Caris Molecular Intelligence Multiplatform Tumor Profiling Identifies Potential Treatment Strategies for Small Cell Cervical Cancer 2Study Using Caris Molecular Intelligence Multiplatform Tumor Profiling Identifies Potential Treatment Strategies for Small Cell Cervical Cancer 3Dr. Robert Leonard Applauds FDA Clearance of Capillus272Pro™ Hair Loss Laser Cap 2
... 3 Advanced Life Sciences,Holdings, Inc. (Nasdaq: ... development and commercialization of novel drugs in the,therapeutic ... it will present and participate in a panel ... Annual JPMorgan Healthcare Conference on January 9,2008., ...
... CEO to Provide Update on the Clinical and Commercial ... Axxent(R) ... Xoft, Inc., developer of the,Axxent(R) Electronic Brachytherapy System, a ... isotope-free,radiation therapy directly to cancer sites, today announced that ...
... to Manufacture; Genzyme will Continue to Market and ... ... and CAMBRIDGE, Mass., Jan. 3 ,BioMarin Pharmaceutical Inc. (Nasdaq and ... a restructuring of their joint venture,regarding Aldurazyme(R) (laronidase). Under the ...
Cached Biology Technology:Advanced Life Sciences to Present at Biodefense Session of 26th Annual JPMorgan Healthcare Conference 2Xoft to Present at the 26th Annual JPMorgan Healthcare Conference 2BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 2BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 3BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 4BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 5
(Date:3/23/2015)...  In the 2014 fiscal year, irs.gov recorded over ... figure accounts for a fraction of the estimated losses ... exceeds $11 billion globally. The polygraph has traditionally been ... occurred. Investor Mark Saint Juste along with ... partnered to administer the test in a new ...
(Date:3/20/2015)... 20, 2015 NXT-ID, Inc. (NASDAQ: NXTD ... focused on the growing mobile commerce market, announces its ... of the products featured in 2015 "I Want That" ... PM EST on the DIY Network.   ... Vegas , site of the 2015 International CES ...
(Date:3/17/2015)... 2015 MedNet Solutions , a ... study management systems, is pleased to announce that ... Outsourcing in Clinical Trials Southeast conference – March ... excellent forum for MedNet to showcase iMedNet ... (SaaS) eClinical technology platform. We strongly ...
Breaking Biology News(10 mins):Polygraph Test Now Used to Protect Investors From Fraud 2Polygraph Test Now Used to Protect Investors From Fraud 3NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 2NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 3Connect With MedNet Solutions At Outsourcing In Clinical Trials Southeast 2
... from the University of Maryland and Beijing Normal University ... climate change internationally. When fully developed, the project ... for example, predict crop failure and changes in commodity ... At the University of Maryland today, officials from ...
... AMES, Iowa Genetic mutations to cellulose in plants could ... a research team that included two Iowa State University chemists. ... early edition of the Proceedings of the National Academy ... chemistry and an associate of the U.S. Department of Energy,s ...
... child,s cognitive development is not generally impacted by how ... according to a study from Nationwide Children,s Hospital. ... for the widest range of confounding factors when directly ... cognition. Insufficient or excessive weight gain in ...
Cached Biology News:UMD and Chinese partner to track and predict world climate change 2Iowa State, Ames Lab chemists aid study of mutated plants that may be better for biofuels 2Gestational weight gain generally does not influence child cognitive development 2
Immunogen: Synthetic peptide: N(171) H G F L S A D Q QL I K(183) Storage: -20 C, Avoid Freeze/Thaw Cycles...
The pCDF Expression System 1 plus Competent Cells contains 10 µg of pET-45b(+) DNA. pET-45b carries an N-terminal His•Tag ® coding sequence that is cleavable with enterokinase as well...
HIV-1 TAT (vN-21)...
Request Info...
Biology Products: