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题名: Isothermal crystallization of polypropylene/surface modified silica nanocomposites
作者: Tang, Hanying1, 2, 3, 4; Dong, Quanxiao5; Liu, Peng1, 2, 3; Ding, Yanfen1, 2, 3; Wang, Feng1, 2, 3; Gao, Chong4; Zhang, Shimin1, 2, 3; Yang, Mingshu1, 2, 3
关键词: composites ; silica ; DOPO ; crystallization ; grafting
刊名: SCIENCE CHINA-CHEMISTRY
发表日期: 2016-10-01
卷: 59, 期:10, 页:1283-1290
收录类别: SCI
英文摘要: In the present work, 3-methacryloxypropyltrimethoxy-silane silanized silica (SiO2-WD70) and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide immobilized silica (SiO2-WD70-DOPO) nanoparticles were prepared. Silica, SiO2-WD70 and SiO2-WD70-DOPO were incorporated into polypropylene (PP) by melt compounding. Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and polarized optical microscopy (POM) were employed to investigate the isothermal crystallization behavior of PP and PP/silica composites. The kinetic constant (k (n) ), and half crystallization time (t (1/2)) were calculated by Avrami equation, while the surface free energy of folding was calculated by Lauritzen-Hoffman theory. The increased k (n) , decreased t (1/2) and the surface free energy (sigma (e)) in the order of PP, PP/SiO2, PP/SiO2-WD70 and PP/SiO2-WD70-DOPO nanocomposites were attributed to the surface modification of silica. XRD indicated that SiO2-WD70-DOPO addition had no effect on PP crystal structure but accelerated the crystallization rate. POM determined that SiO2-WD70-DOPO addition promoted the nucleation of PP by inducing a higher nucleation density during isothermal conditions. The surface modified nanoparticle SiO2-WD70-DOPO might find possible application as a new type of inorganic nano-sized nucleation agent for PP.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35632
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, CAS Key Lab Engn Plast, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.China Acad Railway Sci, State Key Lab Track Technol High Speed Railway, Beijing 100081, Peoples R China
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