1. Hyperbranched polyurethane water dispersion has good performance in coating applications.
Waterborne coatings uses water as the medium, thereby resources is rich, price is cheap, easy to get and non-combustible. Polyurethane waterborne coatings have good water dispersibility, stability, film-forming, adhesion, gloss and solvent resistance performance etc. Adding hyperbranched polymer has the following advantages: (1) low viscosity, some end groups used for curing, shorten the curing time and increase the crosslinking density of the cured film and the film properties; (2) the particle diameter of the water dispersion is about 100nm, and the hyperbranched polyurethane shows good dispersibility and stability in water; (3) The resin has excellent physical and film-forming property , impact resistance achieve maximum 50cm, also choose the right formula varnish according to different drying ways. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "synthesis of hyperbranched polyurethane water dispersion and performance thereof" Wang Li, Tang Jinwei, Tong Shenyi, Wuhan Engineering University, Hubei new reactor and Green Chemical Technology key Laboratory, Wuhan 430074) modern Paint & Finishing, 2007,4 (10),14-16

Good mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure.
Hyperbranched polyesters can be widely used in coatings, either as direct additives, curing agent or as coating substrate, have shown superior performance compared with conventional additives . Introduction of about 1% of hydroxyl-terminated hyperbranched polyester , PU physical and mechanical properties improved significantly. The tensile strength of polyester PU increased 18.2 times compared to PU without hyperbranched polyester; hyperbranched polyester with modified double bonds in the UV-curable coatings has outstanding performance. Such as coatings of flexible material, it shows excellent resistance to oxygen permeability, making oxygen permeability of the PET and PP increased by 2.3 times and 15 times, in addition, adhesion is good on the PET and PP packaging substrate , has broad application prospects. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Preparation and mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure” Zhang Jie, Hu Chunpu* ( School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China)

Dendrimers in the field of crude oil demulsification and viscosity has excellent application. Using divergent to synthesize polyamide-amine dendrimer with ethylenediamine core, especially assessed demulsification performance of PAMAM for the O/W type simulated oil emulsion, and also performance on heavy oil viscosity reduction. The results showed that whole generation PAMAM have good demulsification effect, where 3.0-generation PAMAM at 45 ℃, dosage of 100mg / L, breaking time 60min, the demulsification rate was 80%. Half-generation PAMAM had certain viscosity reducing effect, at 70 ℃, dosage of 0.6%, viscosity reduction time 60min, the viscosity reduction rate was 28.2%. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Demulsification and visbreaking of dendrimers on crude oil" Li Cuiqin, Wang Jun, Yang Hongjun, Yang Peifa, Daqing Petroleum Institute, Daqing, Heilongjiang College of Chemistry and Chemical Engineering

4. Applicatioin of dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield.
Currently used chemical depressurizing and stimulation methods including: conventional acidifying, retarder acidifying, surfactant injection, shrink swelling agent injection, thermochemical technologies injection system. Dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield can effectively solve disadvantages of traditional agent in application of ultra-low permeability oilfield. (1) acid-rock reaction speed is too fast, the penetration distance is short, resulting in ineffective acidification and short period of measures .(2)Surfactant adsorption capacity is big in the near-well place, thus does not reach far wellbore, reducing the effect of the active agent. (3) The injected chemicals is not compatible with the formation fluid and produced new precipitate, resulting in decreased permeability. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield’’, application number: 201210200334.4 Application (patent) by: Yangtze University address: 434020 Hubei Jingzhou South Loop on the 1st applicant: China PetroChina Changqing Oilfield Company ultra-low permeability reservoir research center inventor: Luo Yue, Chang Yanrong, Yang Huan, Shao Dong bo, Zhang Jianguo etal.

PAMAM as gene carrier to enhance transfer efficiency.
PAMAM with DNA can form stable compound, the complex entered by cellular endocytosis into the cell, DNA fight against lysosomal degradation, PAMAM internal multistage amine has good buffer capacity to protect the DNA, and released DNA under the acid conditions to achieve the purpose of transfer. Amidization is easy, by controlling the amount of octadecadienoic acid chloride, grafting it with dendrimer to form the external hydrophobic and internal hydrophilic dendrimer, it can well combinate with DNA in gene transfer process, thereby improving the efficiency of gene transfer. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Preparation and Transfer Efficiency of Modified PAMAM Dendrimer Gene Delivery" Liu Junan, Wei Xiaolei, Jiang Hong, Zhong Wenzhong, College of Science,Huazhong Agricultural University, Wuhan 430070,China;Hubei Nanxing Chemical General Facory,Zhijiang 43200,China.