Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (252 KB bytes)

Title: Crystallization behavior of polypropylene and its effect on woodfiber composite properties

Author: Yin, Suzhou; Rials, Timothy G.; Wolcott, Michael P.;

Date: 1999

Source: In: Fifth international conference on woodfiber-plastic composites; 1999 May 26-27; Madison, WI. Madison, WI: Forest Products Society: 139-146.

Publication Series: Miscellaneous Publication

Description: This paper describes an approach where polarizing optical microscopy is used to observe the crystallization process of different polypropylenes in the presence of wood fiber. The crystallization behavior was found to be related to the chemical composition of the polymer systems and the addition of maleic anhydride grafted polypropylene (MAPP) to polypropylene dramatically altered the crystal structure around the fiber, even at low levels (1 to 2 percent). For neat polypropylene, the wood fiber showed poor nucleating ability, and little difference in bulk and surface crystallization was observed. However, when MAPP was added (1 to 10 percent), the nucleation density at the wood fiber surface became so pronounced that a transcrystalline layer was formed around the fiber. Because the wood fibers themselves had not undergone any prior chemical modification, the increase in nucleation ability of the fiber surface must be attributed to specific interactions between the wood fibers and the maleic anhydride moiety of the MAPP. These observations reveal that the MAPP may not only interact with wood fibers, but may also change the microstructure of the matrix near the fibers. It was observed that the nucleation of the wood fiber surface was selective, indicating that the local physical or chemical characteristics of the fibers might have some influence on the polypropylene crystallization. Dynamic mechanical analysis was used to monitor isothermal crystallization of the polypropylene blends, and provided some additional insight into the contribution of crystalline morphology to strength properties.

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Yin, Suzhou; Rials, Timothy G.; Wolcott, Michael P. 1999. Crystallization behavior of polypropylene and its effect on woodfiber composite properties. In: Fifth international conference on woodfiber-plastic composites; 1999 May 26-27; Madison, WI. Madison, WI: Forest Products Society: 139-146.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.