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Ductile-brittle transition controlled by isothermal crystallization of isotactic polypropylene and its blend with poly(ethylene-co-octene)
Pang, Yongyan1,4; Dong, Xia1; Liu, Kaipeng2,3; Han, Charles C.1; Chen, Erqiang2,3; Wang, Dujin1
2008-09-09
Source PublicationPOLYMER
ISSN0032-3861
Volume49Issue:19Pages:4259-4270
AbstractThe correlation between crystalline morphology development and tensile properties of isotactic polypropylene (iPP) and its blend with poly(ethylene-co-octene) (PEOc) was investigated to study the ductile-brittle transition (DBT) in fracture modes. The sample processing strategy and the scientific observations have never been reported previously. The samples were first isothermally crystallized at 130 degrees C, 123 degrees C or 115 degrees C for a wide range of crystallization times, and then quenched to 35 degrees C for characterization. It was found that the crystallization conditions including crystallization temperature and time governed the crystalline morphology and even the tensile properties of iPP and the iPP/PEOc (80/ 20) blend. The lower the crystallization temperature, the shorter the crystallization time was needed for the occurrence of DBT, and the sharper the transition would be. The addition of the elastomer component delayed the DBT occurrence for the iPP/PEOc blend in terms of the crystallization time, owing to the fact that the existence of PEOc domains between the iPP lamellar stack regions or at the jPP spherulitic boundaries enhanced the ductility of the blend. The X-ray diffraction results displayed the oriented and destroyed crystalline structure characterizing the ductile fracture, while unoriented structure describing the brittle failure. The DBT is closely related to the crystal perfection, and factors such as the crystallization temperature and time and the compositions have been proven to be significant variables in determining the DBT occurrence. (c) 2008 Elsevier Ltd. All rights reserved.
KeywordDuctile-brittle Transition Isothermal Crystallization Isotactic Polypropylene
DOI10.1016/j.polymer.2008.07.017
Indexed BySCI
Language英语
WOS IDWOS:000259303900031
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64282
Collection中国科学院化学研究所
Corresponding AuthorDong, Xia
Affiliation1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Engn Plast,State Key Lab Polymer Phys & C, Beijing 100190, Peoples R China
2.Peking Univ, Dept Polymer Sci & Engn, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
3.Peking Univ, Minist Educ, Coll Chem & Mol Engn, Key Lab Polymer Chem & Phys, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Grad Sch, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Pang, Yongyan,Dong, Xia,Liu, Kaipeng,et al. Ductile-brittle transition controlled by isothermal crystallization of isotactic polypropylene and its blend with poly(ethylene-co-octene)[J]. POLYMER,2008,49(19):4259-4270.
APA Pang, Yongyan,Dong, Xia,Liu, Kaipeng,Han, Charles C.,Chen, Erqiang,&Wang, Dujin.(2008).Ductile-brittle transition controlled by isothermal crystallization of isotactic polypropylene and its blend with poly(ethylene-co-octene).POLYMER,49(19),4259-4270.
MLA Pang, Yongyan,et al."Ductile-brittle transition controlled by isothermal crystallization of isotactic polypropylene and its blend with poly(ethylene-co-octene)".POLYMER 49.19(2008):4259-4270.
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