U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Doll, Kenneth

                                                         - *Ken*
  Submitted to: Journal of the Association for Laboratory Automation
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 2/3/2009
                                    Publication  Date: 8/1/2009
                                    Citation: Doll, K.M. 2009. A Convenient Low-Resolution NMR Method for the Determination of the Molecular Weight of Soybean Oil-Based Polymers. Journal of the Association for Laboratory Automation. 14(4):185-189.Interpretive Summary: We have developed a method using a low resolution instrument to gain information that was previously only available using significantly more expensive technology. Due to its chemical structure, soybean oil undergoes chemical changes when it is heated in the absence of oxygen, or with various chemical catalysts.  One thing that changes significantly is the size of the molecules. We developed a method to study these changes using a low resolution nuclear magnetic resonance spectrometer, commonly available in many laboratories.  This work is a benefit to many laboratories which may have the low resolution instrument, but do not have access to the higher technology.
                                Technical Abstract: By studying a series of soybean oil based polymers, using low resolution nuclear magnetic resonance (NMR) spectroscopy, an easy method to study molecular weight was developed.  The relationship between a polymer’s molecular weight and the instrument’s response can be correlated in a linear relationship.  Correlation constants (r2) of 0.988, when data was taken at -10oC, and 0.999, when the study was done at 0oC, were observed.  Overall, this method is simple and with instrument modification, could be applied to other types of polymers as well.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov