Structure and properties of isotactic polypropylene functionalized by ultraviolet irradiation
Identifieur interne : 009274 ( Main/Exploration ); précédent : 009273; suivant : 009275Structure and properties of isotactic polypropylene functionalized by ultraviolet irradiation
Auteurs : Rong Guan [République populaire de Chine] ; Xi Xu [République populaire de Chine]Source :
- Journal of Applied Polymer Science [ 0021-8995 ] ; 2001-02-22.
English descriptors
- Teeft :
- Absorption bands, Appl, Appl polym, Chemical pollution, Crystal lattice, Crystal lattices, Crystalline morphology, Crystalline plane, Crystallinity, Crystallinity variation, Degradation, Degraded chains, Differential scanning calorimetry, Electron beam, Enthalpy, Enthalpy crystallinity, Experimental conditions, Exural measurements, Ftir spectra, Good agreement, Guan, Heating rate, Impact strength, Infrared spectroscopy, Irradiation, Irradiation process, Irradiation techniques, Irradiation time, Isotactic, Isotactic polypropylene, John wiley sons, Lower energy, Mechanical measurements, Mechanical properties, More chain scission, Other engineering plastics, Peak temperature, Phase spherulite, Phase transition, Polar groups, Polariscope, Polym, Polym degrad stabil, Polymer, Polypropylene, Polypropylene properties, Relative level, Room temperature, Second heating, Short time, Thermal analysis system, Thermal degradation temperature, Thermal history, Thermal stability, Thermogram, Thermomechanical, Thermomechanical analysis, Time increases, Ultraviolet irradiation, Waxd, Waxd analysis.
Abstract
The structural, crystalline, thermal, morphological, and mechanical properties of isotactic polypropylene (iPP) functionalized by lower energy ultraviolet (UV) irradiation are studied by means of infrared spectroscopy (IR), differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), thermogravimetry (TG), thermomechanical analysis (TMA), polariscope, and mechanical measurements. After the UV irradiation in less than a few hours, the oxygen containing polar groups have been introduced onto iPP chains. DSC analysis shows that a new melting peak is observed around 150°C for the UV irradiated iPP, indicating that there is a α‐phase to β‐phase transition during UV irradiation process. Under polariscope, the morphology of the UV irradiated iPP is changed, and the deformed α‐phase morphology can be observed. DSC and WAXD analysis reveal for the crystallinity of the UV‐irradiated iPP increase with UV time, but the relative level and the order of β‐phase increase and then decrease with increasing UV time. Under the controlled UV time, the thermomechanical deformation of iPP decrease, and the initial and final thermal degradation temperature of iPP rises up by 70 to 125°C higher, respectively, indicating that the UV‐irradiated iPP has higher thermal stability than the non‐UV irradiated iPP. The tensile and impact strength, the elongation at break, and the Young's modulus of the UV‐irradiated iPP are enhanced, exhibiting the toughened and strengthened effects. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1456–1466, 2001
Url:
DOI: 10.1002/1097-4628(20010222)79:8<1456::AID-APP130>3.0.CO;2-E
Affiliations:
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wicri:curation="lc">République populaire de Chine</country><wicri:regionArea>Correspondence address: Polymer Research Institute of Chengdu University of Science & Technology, Chengdu, 610065</wicri:regionArea><wicri:noRegion>610065</wicri:noRegion></affiliation></author><author><name sortKey="Xu, Xi" sort="Xu, Xi" uniqKey="Xu X" first="Xi" last="Xu">Xi Xu</name><affiliation wicri:level="1"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Polymer Research Institute of Chengdu University of Science & Technology, Chengdu, 610065</wicri:regionArea><wicri:noRegion>610065</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Applied Polymer Science</title><title level="j" type="alt">JOURNAL OF APPLIED POLYMER SCIENCE</title><idno type="ISSN">0021-8995</idno><idno type="eISSN">1097-4628</idno><imprint><biblScope unit="vol">79</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="1456">1456</biblScope><biblScope unit="page" to="1466">1466</biblScope><biblScope unit="page-count">11</biblScope><publisher>John Wiley & Sons, Inc.</publisher><pubPlace>New York</pubPlace><date type="published" when="2001-02-22">2001-02-22</date></imprint><idno type="ISSN">0021-8995</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-8995</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Absorption bands</term><term>Appl</term><term>Appl polym</term><term>Chemical pollution</term><term>Crystal lattice</term><term>Crystal lattices</term><term>Crystalline morphology</term><term>Crystalline plane</term><term>Crystallinity</term><term>Crystallinity variation</term><term>Degradation</term><term>Degraded chains</term><term>Differential scanning calorimetry</term><term>Electron beam</term><term>Enthalpy</term><term>Enthalpy crystallinity</term><term>Experimental conditions</term><term>Exural measurements</term><term>Ftir spectra</term><term>Good agreement</term><term>Guan</term><term>Heating rate</term><term>Impact strength</term><term>Infrared spectroscopy</term><term>Irradiation</term><term>Irradiation process</term><term>Irradiation techniques</term><term>Irradiation time</term><term>Isotactic</term><term>Isotactic polypropylene</term><term>John wiley sons</term><term>Lower energy</term><term>Mechanical measurements</term><term>Mechanical properties</term><term>More chain scission</term><term>Other engineering plastics</term><term>Peak temperature</term><term>Phase spherulite</term><term>Phase transition</term><term>Polar groups</term><term>Polariscope</term><term>Polym</term><term>Polym degrad stabil</term><term>Polymer</term><term>Polypropylene</term><term>Polypropylene properties</term><term>Relative level</term><term>Room temperature</term><term>Second heating</term><term>Short time</term><term>Thermal analysis system</term><term>Thermal degradation temperature</term><term>Thermal history</term><term>Thermal stability</term><term>Thermogram</term><term>Thermomechanical</term><term>Thermomechanical analysis</term><term>Time increases</term><term>Ultraviolet irradiation</term><term>Waxd</term><term>Waxd analysis</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The structural, crystalline, thermal, morphological, and mechanical properties of isotactic polypropylene (iPP) functionalized by lower energy ultraviolet (UV) irradiation are studied by means of infrared spectroscopy (IR), differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), thermogravimetry (TG), thermomechanical analysis (TMA), polariscope, and mechanical measurements. After the UV irradiation in less than a few hours, the oxygen containing polar groups have been introduced onto iPP chains. DSC analysis shows that a new melting peak is observed around 150°C for the UV irradiated iPP, indicating that there is a α‐phase to β‐phase transition during UV irradiation process. Under polariscope, the morphology of the UV irradiated iPP is changed, and the deformed α‐phase morphology can be observed. DSC and WAXD analysis reveal for the crystallinity of the UV‐irradiated iPP increase with UV time, but the relative level and the order of β‐phase increase and then decrease with increasing UV time. Under the controlled UV time, the thermomechanical deformation of iPP decrease, and the initial and final thermal degradation temperature of iPP rises up by 70 to 125°C higher, respectively, indicating that the UV‐irradiated iPP has higher thermal stability than the non‐UV irradiated iPP. The tensile and impact strength, the elongation at break, and the Young's modulus of the UV‐irradiated iPP are enhanced, exhibiting the toughened and strengthened effects. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1456–1466, 2001</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Guan, Rong" sort="Guan, Rong" uniqKey="Guan R" first="Rong" last="Guan">Rong Guan</name></noRegion><name sortKey="Guan, Rong" sort="Guan, Rong" uniqKey="Guan R" first="Rong" last="Guan">Rong Guan</name><name sortKey="Xu, Xi" sort="Xu, Xi" uniqKey="Xu X" first="Xi" last="Xu">Xi Xu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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