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Article: Crystallization Kinetics of Poly(butylene terephthalate) (PBT): Influence of Additives and Free Carboxylic Acid Chain Ends.
- Article from:
- Polymer Engineering and Science
- Article date:
- February 1, 2001
- Author:
CopyrightCOPYRIGHT 2001 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Degradation of poly(butylene terephthalate) (PBT) induced by blending time at 260[degrees]C leads to an increase of both carboxylic end groups and melt viscosity index and a decrease of the molecular weights. Crystallization kinetics of pure PBT and PBT blended with an epoxide, which was used to reduce the free carboxylic acid concentration, were compared. Lower carboxylic acid concentrations were obtained, but the molecular weights still decreased. The crystallization kinetics of PBT blended with pigments and/or mineral fillers were also studied. Dyes, some of which are known for their nucleation activity, were used for differentiating extruded PBT tubes in optical fiber ...
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Article: U.S., British Inventors Develop Alkylated Thiazoline ...
US Fed News Service, Including US State News;
October 29, 2007 ;
549 words
... ... preparing an alkylated thiazoline carboxylic acid, or a derivative thereof, comprises ... form a substituted thiazoline carboxylic acid ester; optionally hydrolyzing the substituted thiazoline carboxylic acid ester to form a substituted thiazoline ...
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