A novel hydrophobically modified and cationic flocculant poly(acrylamide-methacryloxyethyltrimethyl ammonium chloride-methacryloxypropyltrimethoxy silane) (P(AM-DMC-MAPMS)) was synthesized by inverse emulsion polymerization. The molecular structure of hydrophobically cationic polyacrylamide (HCPAM) was characterized by FTIR and 1 H-NMR. The effects of DMC and MAPMS feed ratio on intrinsic viscosity and solubility were measured. The effects of hydrophobically cationic flocculants on reactive brilliant red X-3B solution and kaolin suspension were studied. It was found that the introduction of MAPMS could increase the intrinsic viscosities of P(AM-DMC-MAPMS) and enhance the flocculation properties to anionic dye solution and kaolin suspension, but reduced their water-solubility. V

Poly(acrylamide-diallyldimethyl ammonium chloride-vinyl trimethoxy silane) [P (AM-DAD-MAC-VTMS)] was prepared by inverse free-radical emulsion polymerization technique. VTMS segment was hydrolyzed and condensed to form three dimensional networks. The effects of different factors, such as hydrophobic monomer feed ratio, cationic monomer feed ratio, pH value, and NaCl concentration, on decolorization efficiency were studied. Moreover, the decolorization mechanism was also explained by analyzing FTIR spectra and UV-vis spectra. The introduction of VTMS on flocculant enhanced removal efficiency of dye molecules. With the increasing VTMS, adsorption and net roofing-sweeping action of hydrophobically modified cationic polyacrylamide played the dominant role in the decoloring process of anion dye.

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A series of polymeric flame retardants (PFRs) containing phosphorus-nitrogen-bromide were synthesized from spirocyclic pentaerythritol bisphosphorate disphosphoryl chloride (SPDPC), 2-methoxyl-4,6-dichloro-1,3,5-triazine (MDCT), and tetrabromobisphenol A (TBBPA). The influence of monomer ratio on their thermal stability was investigated by adjusting the proportion of SPDPC/MDCT (mol/mol) from 80/20 to 20/80. The flammability properties of the PFRs blended with ABS were evaluated using LOI and UL-94 vertical test. The structures of the flame retardants were characterized by means of Fourier transform infrared spectra (FTIR) and proton nuclear magnetic resonance spectroscopy ( 1 H-NMR). The results show that the initial temperature of decomposition is 274 C and with 35% charring residue at 500 C when the ratio of SPDPC/MDCT is 50/ 50. V-0 ratings in the UL-94 vertical test were achieved at 20-30% loading of PFRs, when LOI values reached at least 26.9%. The flame retardancy is strongly dependent on the ratio of P, N, and Br.

A novel thermal stabilizer poly(dioctyltin maleate-styrene-methyl acrylate) [P(DOTM-St-MA)] was synthesized by radical solution polymerization with benzene as the solvent and 2,2-azobisisobutyronitrile as the initiator. The structure of terpolymer was characterized by FTIR and 1 H-NMR spectra, and thermal stability of the stabilizer was measured by thermogravimetric analysis (TGA). Evaluation of [P(DOTM-St-MA)] as thermal stabilizer for poly(vinyl chloride) (PVC) was measured by acidimeter, and the extent of changing color of PVC was measured by thermal aging method. Compatibilities of four stabilizers with PVC were characterized by scanning electron microscope (SEM). The results showed that, with the same tin content in PVC mixtures, [P(DOTM-St-MA)] exhibited better performance as a PVC stabilizer compared with other stabilizers, such as poly(dibutylin maleate-styrene-methyl acrylate), DOTM, and dibutylin maleate (DBTM). Furthermore, [P(DOTM-St-MA)] had better compatibility with PVC in PVC processing.

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A temperature-/pH-responsive hydrogel was successfully prepared by in situ free radical polymerization of N-isopropyl acrylamide (NIPAm), itaconic acid (IA), and poly (ethylene glycol) methyl ether acrylate (OEGA). The pore size, mechanical strength, and swelling ratio of the P(NIPAm-IA-OEGA) were strongly affected by the contents of IA. 5-Fluorouracil (5-Fu) was chosen as a model drug, and the maximum drug loading was 68 mg/g. P(NIPAm-IA-OEGA) had a much greater release rate in a simulated intestinal fluid environment (47.73 %, 16 h) than in gastric juice (33.11 %, 16 h). The hemolysis test and cytotoxicity test proved that prepared hydrogel had good biocompatibility. In summary, P(NIPAm-IA-OEGA) can be used for oral drug delivery systems in cancer therapy.