Chain polymerization

The research part comprised a systematic study of the synthesis and phase separation of Interpenetrating Polymer Network (IPN) gels consisting of crosslinked polyurethane (CPU) and polymethacrylic acid (PMA). CPU was prepared by crosslinking polyaddition between the triblock polyalkylene oxide (ethylene oxide-propylene oxide-ethylene oxide), diisocyanate, crosslinker (triethanolamine) and chain extender (1,4-butanediol). IPN gels based on CPU and PMA were formed by the sequential interpenetrating polymerization (two-stage procedure).

5p uocvong04 24-09-2015 57 7   Download

Epoxy-cardanol nanocomposites were prepared by insitu polymerization techniques. Their structures and properties were investigated by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The results showed that the chains of epoxy-cardanol resin could be intercalated into the galleries of nanoclay I.30E to form exfoliated structure. The influence of nanoclay I.30E on the thermal of epoxy-cardanol resin was determined by TGA method, which showed an increase with increasing amounts of nanoclay I.30E.

5p uocvong04 24-09-2015 74 5   Download

Xanthomonas campestrispv.vitians is a Gram-negative plant-associated bacterium that acts as causative agent of bacterial leaf spot and headrot in lettuce. The lipopolysac-charide of this bacterium is suspected to be an important molecule for adhesion to and infection of the plants. The lipopolysaccharide has been isolated from the phenol phase and the O-specific chain characterized by compositional analysis, high fieldNMRandMALDI-TOFMS.

9p research12 23-04-2013 45 2   Download

Natural rubber fromHevea brasiliensisis a high molecular mass polymer of isoprene units withcis-configuration. The enzyme responsible for the cis-1,4-polymerization of iso-prene units has been identified as a particle-bound rubber transferase, but no gene encoding this enzyme has been cloned from rubber-producing plants. By using sequence information from the conserved regions of cis-prenyl chain elongating enzymes that were cloned recently, we have iso-lated and characterized cDNAs from H.

10p fptmusic 12-04-2013 42 2   Download

The discovery of prion disease and the establishment of the protein only hypothesis of prion propagation raised substantial interest in the class of maladies referred to as conformational diseases. Although significant pro-gress has been made in elucidating the mechanisms of polymerization for several amyloidogenic proteins and peptides linked to conformational dis-

10p galaxyss3 21-03-2013 52 4   Download

Four mAbs of the IgG1 class to the thrombin-treated N-terminal disulfide knot of fibrin, secreted by various hybridomas, have been selected. Epi-topes for two mAbs, I-3C and III-10d, were situated in human fibrin frag-ment Bb15–26, and those for two other mAbs, I-5G and I-3B, were in fragment Bb26–36.

10p media19 04-03-2013 23 1   Download

Tâm hoạt động không hiện diện sẳn trên monomer: hoặc được sinh ra tại chỏ dưới tác dụng của nguồn năng lượng bên ngoài hoặc thông qua việc sử dụng 1 tác nhân hóa học ( chất khơi mào). Tâm hoạt động: Đóng vai trò phát triển mạch polymer thông qua sự công vào monomer - phản ứng dây chuyền. Sự phát triển của mạch polymer ngừng lại khi tâm hoạt động bị bất hoạt bởi các phản ứng truyền mạch hoặc tắt mạch....

58p ncaothach 26-01-2011 605 176   Download

Classes There are five major classes of hemoglobinopathies (Table 99-1). Structural hemoglobinopathies occur when mutations alter the amino acid sequence of a globin chain, altering the physiologic properties of the variant hemoglobins and producing the characteristic clinical abnormalities. The most clinically relevant variant hemoglobins polymerize abnormally, as in sickle cell anemia, or exhibit altered solubility or oxygen-binding affinity. Thalassemia syndromes arise from mutations that impair production or translation of globin mRNA, leading to deficient globin chain biosynthesis.

5p thanhongan 07-12-2010 57 5   Download