NIST develops technology for checking PE pipes

Published: January 16, 2013 9:55 pm ET

Related to this story

Topics Construction, Pipe/Profile/Tubing

GAITHERSBURG, MD. (Jan. 16, 2:25 p.m. ET) — The National Institute of Standards and Technology (NIST) has developed an enhanced form of chemical microscopy that can reveal in detail the interaction between molecules in blended polymers. The technique could prove useful for estimating the life cycle of polyethylene water pipes and joints.

Although PE water pipes have a predicted service life of up to 100 years, current tests are unable to accurately predict service life under field conditions, particularly at fusion joints. Water pipes are predominantly made from a blend of high and linear low density PE.

NIST materials scientist Young Jong Lee says that the combination improves the toughness, strength and fracture resistance of the polymer but, until now, we did not know exactly how this interaction works.

HDPE and LLDPE are so close chemically that it has been impossible to distinguish one from the other using X-ray or scanning electron microscopy. NIST’s development, which it calls BCARS (short for Broadband Coherent Anti-Stokes Raman Scattering) uses two lasers to analyse the frequencies associated with the different vibrational modes of each molecule.

By controlling the polarization of the light, the technique provides additional details on the local crystal orientation of molecules in the polymer. The images show, for example, the formation of microscopic spherical regions of partial crystallization with the LLDPE more concentrated towards the center.

Lee said: “This is a fast, three-dimensional chemical imaging technique that’s particularly useful for studying microstructures of polymeric materials”. The group is currently using BCARS to find the correlation between microscopic structures with characteristics of deformation and thermal fusion on PE pipes.


Comments

NIST develops technology for checking PE pipes

Published: January 16, 2013 9:55 pm ET

Post Your Comments


Back to story


More stories

A third generation is adding to the growth at American Vinyl Co.

July 28, 2014 4:32 pm ET

American Vinyl Co., a compounding and extrusion company that increased its workforce 20 percent this year, is looking to double its space for storing ...    More

Image

Who are the fastest growing pipe, profile and tubing extruders?

July 28, 2014 3:09 pm ET

Question: What's the word on this week's Plastics News annual ranking of the top Pipe, Profile and Tubing extruders in North America? Answer: Up....    More

Image

Australian trade group battles non-compliant PVC pipe fittings

July 28, 2014 2:19 pm ET

An Australian plastics industry association is battling against imported, non-conforming PVC pipe fittings, but is stymied by a convoluted web of...    More

Image

ADS launches public trading on NYSE

July 25, 2014 10:41 am ET

Advanced Drainage Systems, the world's largest producer of thermoplastic corrugated pipe, made its debut on the New York Stock Exchange today with 14....    More

Image

Injection molder, recycler Polyvulc USA puts itself up for sale

July 24, 2014 12:41 pm ET

Fred Farrell and Larry Lambiotte, founders of Polyvulc USA Inc. and its subsidiaries Polyvulc Tire Recycling Llc and Winnsboro Rubber Recycling LLC, a...    More

Market Reports

Plastics Recyclers Data Report & Directory

This exclusive MS Excel database contains all the companies from Plastics News' ranking of top North American Recyclers and Brokers by reprocessed volume and also includes a directory with materials processes, services offered and company contact information. Data is based on primary research by PN editorial staff.

Learn more

2014 Injection Molding Industry Report

GROWTH, OPPORTUNITY IN SIGHT FOR INJECTION MOLDERS IN 2014

In the wake of the economic turbulence earlier in this decade, molders today find themselves in much better shape. Molders are gaining a competitive advantage by investing in people, equipment and seeking inroads into new markets on a global scale.

Growth in the injection molding industry is going to be driven by low financing costs and a continued move to reshore some business.

Learn more

Shale Gas Market - Analysis of North American Region

This report highlights the impact of shale-based natural gas on the North American plastics market and features an in-depth analysis of production trends in the United States during 2013 and a forecast for 2014 and beyond.

Learn more

Upcoming Plastics News Events

September 10, 2014 - September 12, 2014Plastics Caps & Closures 2014

January 14, 2015 - January 14, 2015Plastics in Automotive

February 4, 2015 - February 6, 2015Plastics News Executive Forum 2015

More Events