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Search Results: 1 - 10 of 27637 matches for " Hu Youliang "
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Synthesis of well-defined functional PE graft copolymers via ATRP process
Cao Chengang,Dong Jinyong,Hu Youliang
Chinese Science Bulletin , 2005, DOI: 10.1360/982004-555
Abstract: In summary, we have demonstrated a convenient yet highly efficient method for the preparation of PE-based graft copolymers via ATRP. By introducing a small amount of styrene groups into PE chains via the selective copolymerization of ethylene with 1,4-divinylbenzene catalyzed by Et(Ind)2ZrCl2/MAO, the multifunctional ATRP initiator of 1-chloroethylbenzene-containing PE was readily achieved by a quantitative hydrochlorination reaction and was shown to be very effective for the initiation of graft polymerization of MMA and styrene to prepare structurally well-defined PE-based graft copolymers.
The influence of the metal net charge of non-metallocene early transition metal catalyst on the ethylene polymerization activity
ChunHong Wu,HuaYi Li,YuQi Feng,YouLiang Hu
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0460-9
Abstract: The net charges on central metals of a serial non-metallocene early transition metal catalysts (FI catalyst) with similar steric hindrance were caculated with MM-QEq (molecular mechmism-charge equilibration) method and associated with ethylene polymerization activities of these FI catalyts. It was found that the activity increased with the net charge on metal if ignoring the influence of the steric hindrance. In other words, introduction of strong and/or more electron-withdrawing groups onto the ligand of FI catalyst would enhance the activity of the catalyst. This conculsion gave a direction to designing new FI catalyst with higher activity.
Salt glands inGlycine soja L. China
Jingmei Lu,Youliang Liu,Bo Hu,Bingchang Zhuang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885066
Abstract: A scanning electron microscope observation is carried out onGlycine soja L., which grows around the estuary of the Yellow River, in Kenli County, Shandong Province. It is first discovered that there are salt glands, in the shape of balls, on the surface of the stems and leaves ofG. soja L., and distributed at the intercellular layer. With a handle at the base, the salt glands are not equal in size, and show a layer-upon-layer structure. They have a diameter of 21.6 μm, a handle length of 1.2 μm, their secretory pore’s diameter is 5.6 μm. There are two ways to secrete salt ions: younger glands secrete salt ions through the secretory pore, and mature glands by breaking themselves.
The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst
Mingge Zhang,Demin Xu,Han Hong,Cunyue Guo,Youliang Hu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9182
Abstract: SiO2/rac-Me2Si[2-Me-4-Naph-Ind]2ZrCl2 was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.
Salt glands in Glycine soja L. China

Jingmei Lu,Youliang Liu,Bo Hu,Bingchang Zhuang,

科学通报(英文版) , 1999,
Abstract: A scanning electron microscope observation is carried out onGlycine soja L., which grows around the estuary of the Yellow River, in Kenli County, Shandong Province. It is first discovered that there are salt glands, in the shape of balls, on the surface of the stems and leaves ofG. soja L., and distributed at the intercellular layer. With a handle at the base, the salt glands are not equal in size, and show a layer-upon-layer structure. They have a diameter of 21.6 μm, a handle length of 1.2 μm, their secretory pore’s diameter is 5.6 μm. There are two ways to secrete salt ions: younger glands secrete salt ions through the secretory pore, and mature glands by breaking themselves.
Synthesis of well-defined functional PE graft copoly-mers via ATRP process
Synthesis of well-defined functional PE graft copolymers via ATRP process

Cao Chengang,Dong Jinyong,Hu Youliang,
CAOChengan
,DONGJinyong,HUYouliang

科学通报(英文版) , 2005,
Abstract: Conclusion In summary, we have demonstrated a convenient yet highly efficient method for the preparation of PE-based graft copolymers via ATRP. By introducing a small amount of styrene groups into PE chains via the selective copolymerization of ethylene with 1,4-divinylbenzene catalyzed by Et(Ind)2ZrCl2/MAO, the multifunctional ATRP initiator of 1-chloroethylbenzene-containing PE was readily achieved by a quantitative hydrochlorination reaction and was shown to be very effective for the initiation of graft polymerization of MMA and styrene to prepare structurally well-defined PE-based graft copolymers.
New synthesis of amphiphilic copolymers PE-g-PEO via esterfication
Yingying Lü,Zhi Ma,Youliang Hu,G. X. Xu,T. C. Chung
Chinese Science Bulletin , 2003, DOI: 10.1360/03tb9111
Abstract: A new series of high molecular weight amphiphilic graft copolymers PE-g-PEO has been prepared. The esterifications between PE-p-MS-g-MA and PEO with OH group at the chain end are carried out under different conditions. The compositions of these graft copolymers are studied by NMR and FTIR. It is found to be a convenient and efficient way to prepare high molecular weight PE-g-PEO graft copolymers.
Lldpe prepared byin situ polymerization using a dualfunctional catalytic system of Ti(On-Bu)4 /ALEt3-Et(Ind)2-ZrCl2/MAO
Liu Zhongyang,Xu Demin,Guo Cunyue,Wang Jun,He Dawei,Hu Youliang
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02901130
Abstract: Linear low-density polyethylene (LLDPE) was prepared byin situ polymerization using a dual-functional catalytic system containing Et(Ind)2ZrCl2/MAO and Ti(OnBu)4/AlEt3 used as co-polymerization catalyst and dimerization catalyst, respectively. The catalytic system showed high activity and the polymer with low melting point, narrow molecular weight distribution (MWD) and low crystallinity was produced.
Ethylene oligomerization by novel iron(II) diimine complexes/MAO
Hang Wang,Weidong Yan,Tao Jiang,Binbin Liu,Wenqing Xu,Jianjiang Ma,Youliang Hu
Chinese Science Bulletin , 2002, DOI: 10.1007/BF03184109
Abstract: Two novel Fe(II) diimine complexes have been synthesized. In combination with MAO, they generate active catalytic systems that oligomerize ethylene with both high catalytic activity and high selectivity for α-olefins. The effects of substituents on the aryl ring, reaction temperatures and molar ratios of Al/Fe on catalytic activity and product distribution are studied.
Preparation of PE/MMT nanocomposite by monomer intercalation and in situ copolymerization
Cunyue Guo,Zhi Ma,Mingge Zhang,Aihua He,Yucai Ke,Youliang Hu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9280
Abstract: The catalyst [(2-ArN=C(Me))2C5H3N]FeCl2 (Ar = 2-C6H4(i-Pr)) with methylaluminoxane (MAO) as cocatalyst was intercalated between layers of montmorillonite (MMT) for ethylene oligomerization. Metallocene catalyst Me2Si(Ind)2ZrCl2 and MAO was then added to form a dual functional catalytic system. A PE/MMT nanocomposite was prepared by copolymerization of ethylene with α-olefins produced in situ from ethylene over the dual functional catalytic system. The catalytic system was of high polymeric activity. The resultant PE/MMT nanocomposites were stable and got increases in tensile strength and temperature of maximum weight loss (Tonset).
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