Experimental study of shear-induced crystallization of an impact polypropylene copolymer (Record no. 45806)

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fixed length control field 02222nam a2200265Ia 4500
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control field MX-MdCICY
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20250625140653.0
040 ## - CATALOGING SOURCE
Transcribing agency CICY
090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN)
Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-11590
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
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245 10 - TITLE STATEMENT
Title Experimental study of shear-induced crystallization of an impact polypropylene copolymer
490 0# - SERIES STATEMENT
Volume/sequential designation Colloid & Polymer Science, 274, p.197-208, 1996
520 3# - SUMMARY, ETC.
Summary, etc. The crystallization kinetics of polypropylene was observed during shear and after shear experiments under isothermal condition. The crystallizations were performed in a plate-plate and a fiber pull-out device. The nucleation density, the crystalline growth and the overall kinetics were measured and compared with data obtained in a similar way but during static experiments. The morphologies are spherulitic and formed from nuclei which seem to be randomly distributed, a-phase spherulites are always observed but with a nucleation density and a growth rate which depend on shearrate. The nucleation density is strongly enhanced by shear and acts as the main factor on the overall kinetics. The overall kinetics can be analyzed with a two-step Avrami model, where an Avrami exponent n~ with a very high value is always observed first after shear and a more usual parameter n2 for the subsequent crystallization period. This high value of n~ seems to be related to the strong enhancement of nucleation density. The growth rate increases with the shear-rate, but the basic growth mechanisms do not seem to be modified. For crystallizations after shear the growth rate decreases with a long-time delay after shear but not down to the static value. The effect is characteristic of a partial relaxation of chain orientation after shear but with a very unusual time constant.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element SHEAR-INDUCED CRYSTALLIZATION
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element NUCLEATION
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element GROWTH
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element OVERALL KINETICS
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element POLYMER
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element POLYPROPYLENE
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Tribout, C.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Monasse, B.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Haudin, J.M.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1bZVWG_GSfe6HPf0fnH7TQxMIQxhXeKKA/view?usp=drivesdk">https://drive.google.com/file/d/1bZVWG_GSfe6HPf0fnH7TQxMIQxhXeKKA/view?usp=drivesdk</a>
Public note Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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