Dendritic polymers exhibit a high surface activity, at very low concentrations – critical aggregation concentration (CACs), they have the ability to aggregate in the water itself. With PAMAM generation increases, CACs reduces, molecular weight and structure has important impacts for the control of surface activity and CAC. Dendritic polymers are effective adhesion promoter for urea formaldehyde (UF) resin, it may increase the surface wettability due to its large number of surface group. End reactive groups at dendritic polymer chain can form large aggregation through its function when at very low concentrations. Formation of the polymer significantly decreases the surface tension of the aqueous solution. They form their surface activity in the air – water interface. Adding G3-NH3Cl in the urea-formaldehyde resin can significantly improve the adhesion of wood adhesives. Weihai CY Dendrimer Technology Co. Ltd forwards from “Different End Groups, as Adhesion Promoters for Urea-Formaldehyde Wood Adhesive System” Hisham A. Essawy, Heba A. Mohamed Department of Polymers and Pigments, National Research Center, Dokki 12311, Egypt Journal of Applied Polymer Science, Vol. 119, 760-767 (2011)
Dendrimer-coated metallic catalyst has the following advantages: ① using pure metal particles as catalyst, the mutual attraction between the particles make catalyst agglomeration and the catalyst activity decreased, while after coated by dendrimer, it can prevent agglomeration, improve the catalytic ability; ②interior nano cavity environment of dendrimer has a strong selective catalytic function ; ③dissolve in environment-friendly water, supercritical CO2 , organic solvents and volatile Freon etc. when in the reaction with the characteristics of homogeneous catalysis; ④ as it is such a nano-size molecules, can be separated by a simple separation techniques (such as nanofiltration or dialysis) from the homogeneous reaction mixture. Weihai CY Dendrimer Technology Co. Ltd forwards from “The progress of dendrimer metallic catalysts”, Wang Zongting, Dong Guoru, Cheng Dongling, Li Hao, Zhang Qingyun (China Petroleum University, College of Chemistry and Chemical Engineering, Qingdao 266555) Vol.39 No. 5 May 2010 Applied Chemical Industry.
Adding <0.5wt% of the hyperbranched polymer can reduce spinning temperature of nylon 6 by
20 ℃, lower spinning temperature can greatly reduce the high temperature thermal degradation of nylon 6, to improve product performance. Specification (1) adding hyperbranched polymer can reduce the melt viscosity of nylon 6, to improve the melt processability; (2) hyperbranched polyester can be uniformly dispersed in the matrix of the PET , the size is between tens to hundreds of nanometers; (3) mechanical properties of PET plastic spline does not affect by adding hyperbranched polymer. Weihai CY Dendrimer Technology Co. Ltd forwards from “Effective application of Hyperbranched polyester in the processing of nylon 6 and the PET” , Zhan Shan ,Dong Hua University, master’s degree thesis in 2007
Hyperbranched polyester modified nanoparticles can greatly enhance impregnating varnish performance.
Using Al2O3 nano-particles modiffied by aliphatic hyperbranched polydihydroxytoluene propi-onate(HMPA) as filler, using insulating impregnating varnish as matrix to prepare thermal conductivity impregnating varnish to study its performance. Get the following conclusions: (a) hyperfunctional Al2O3 nanoparticles can effectively improve the dispersion performance and interface compatibility of the particles in the varnish, when the particles filling amount is 20%, hyperfunctional Al2O3 nanoparticles can still evenly dispersed in the varnish, almost invisible agglomeration, while the particles without modification have serious agglomeration. (2) varnish filled with hyperfunctional Al2O3 nanoparticles, its impact strength, thermal conductivity is significantly improved. When the filling amount is 20%, varnish filled with hyperfunctional Al2O3 nanoparticles reaches maximum impact properties which are 4.96 times than non filled. When the filler content is 25% and filled with hyperfunctional Al2O3 nanoparticles, impregnating varnish thermal conductivity reaches the maximum which is 1.82 times than non filled. (3)composite volume resistivity is increased if filling with hyperfunctional Al2O3 nanoparticles , but increased slightly, keep within an order of magnitude, the varnish is still able to maintain good electrical insulation. Weihai CY Dendrimer Technology Co. Ltd forwards from “Study of Impregnating Varnish Modified with Hyperbranched Al2O3 Nanoparticles” Fu JiFang a, b, Xiao Yinglin a, Chen Yi a, b, Shi Liyi a, b, Chen Liya a, Zhong Qingdong a, b (a. Nano-Science and Technology Research Center of Shanghai University ; b. School of Materials Science and Engineering, Shanghai University, Shanghai 200072) Insulation Materials, 2011, 44 (2), 4-8
Hyperbranched polyester can significantly improve the toughness of epoxy coating, i.e impact resistance, with an increase in the amount of hyperbranched polyester, the impact resistance increases, while the addition level of 15%, the impact resistance increases by 296% and have no impact on the epoxy resin matrix curing condition, rate, and mechanical strength, which is attributed to plasticizing properties of hyperbranched polyester and particles structure in the epoxy resin phase.Weihai CY Dendrimer Technology Co. Ltd forwards from “Hyperbranched Polymers in Cationic Photopolymerization of Epoxy Systems” M. SANGERMANO ‘, G. MALUCELLI1, R. BONGIOVANNI’, A. PFUOLA1 *, A. HARDEN2, and N. REHNBERG2 lDipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico di ToMo, C.so Duca degli Abruzzi 24 I-1 01 29 Torino, Italy 2Perstorp Specialty Chemicals, 284 80 Perstorp, Sweden POLYMER ENGINEERING AND SCIENCE, AUGUST 2003, Vol. 43, No. 8,1461 -1465
Hyperbranched PAMAM can be used as toughening agent for fast curing epoxy adhesive systems to well improve the impact resistance of adhesive, impact resistance is three times improvement compared with system without hyperbranched PAMAM , best dosage is generally about 2% -3% , and can increase the adhesion properties of adhesive and the metal substrate, adhesion properties improved by 23%.Weihai CY Dendrimer Technology Co. Ltd forwards from “Upgrading the Adhesion Properties of a Fast-Curing Epoxy Using Hydrophilic/Hydrophobic Hyperbranched Poly(amidoamine)s”Hisham A. Essawy, Heba A. Mohamed, Nadia H. Elsayed Department of Polymers and Pigments, National Research Center, Dokki 12311, Cairo, Egypt Correspondence to: H. A. Essawy (E-mail: email@example.com)J. APPL. POLYM. SCI. 2013,4505-4514 DOI: 10.1002/APP.38050
In blend system of Phenolic resin (PF) and hyperbranched polyester (HBPE),PF phenolic hydroxyl group and HBPE terminal hydroxyl group occurs hydrogen bonding action, and the blends show single glass transition temperature, indicating better compatibility between the blends; adding HBPE can improve the impact strength of the cured PF and bending strength, when HBPE content is 15%, the impact strength is up to the maximum and improved over the original untreated by 145% , toughening effect is more obvious. Weihai CY Dendrimer Technology Co. Ltd forwards from “Hyperbranched Polyester modified phenolic resin’s preparation and curing properties study” Songsong Wang 1, Dapeng Zhou 2 *,Li GU 2,Jian Li1,LiQiong Yu 3 (1 School of Materials Science and Engineering of Changzhou , Changzhou, Jiangsu 213164; 2 School of Biological and Chemical Engineering of Jiaxing, Jiaxing 314033; 3. Zhe Jiang Jiamin Plastic Co., Ltd., Jiaxing, Zhejiang 314027) China plastics, 2011,6 (25) :34-37
Separating CO2 from other gases and vapors for industrial applications,space travel as well as control of greenhouse is very important. No holes and glassy polymeric membrane has a relatively low CO2/CH4 and CO2/N2 selectivity, particularly when carbon dioxide content is low. Selectivity of CO2 in the water through the activation of primary amine and tertiary amine groups, taking G0 as the membrane liquid, will effectively promote the transport of CO2 and effectively prevent other gaseous substances transport. Weihai CY Dendrimer Technology Co. Ltd forwards from “Dendrimer Membranes: A CO2-Selective Molecular Gate” A. Sarma Kovvali, Hua Chen, and Kamalesh K. Sirkar Department of Chemical Engineering Chemistry and EnVironmental Science New Jersey Institute of Technology, Newark, New Jersey 07102 ReceiVed April 14, 2000
PAMAM modified hollow fiber membrane shows a strong binding capacity with copper ion, lead ion and cadmium ion. Third generation PAMAM cylindrical hollow fiber membrane remains 72% of the binding ability after recycled 5 times. Also when the G3-HFM soaked in CuCl2, Pb-(NO3) 2, & CdCl2 solution, the surface will precipitate Cu2(OH)3Cl, Pb3(CO3)2(OH)2, &CdCO3,the hollow fiber membranes without dendritic change does not precipitate crystals. Weihai CY Dendrimer Technology Co. Ltd forwards from “Polyamidoamine Dendronized Hollow Fiber Membranes in the Recovery of Heavy Metal Ions” Qian Zhang, Na Wang, Libo Zhao, Tongwen Xu, and Yiyun Cheng Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai, 200062, People’s Republic of China CAS Key Laboratory of Soft Matter Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China