Polymer Bulletin
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Magnesium oxide-supported polytitazane cobalt(III) complex for catalytic epoxidation of α-pinene with molecular oxygen
Polymer Bulletin - Tập 36 - Trang 1-5 - 1996
Magnesium oxide-supported polytitazane cobalt complex has been prepared and found to be a very effective catalyst for the epoxidation of α-pinene in the presence of an aldehyde as a reductant. XPS data show that the high valent cobalt(III) was stabilized by the mutidentate nitrogen ligand of polytitazane. The α-pinene oxide can be obtained in 96.0% yield with 96.6% selectivity at 25°C under an atm......
Radiation Graft Copolymerization of Acrylic Acid and N -Isopropylacrylamide from binary mixtures onto Polytetrafluoroethylene
Polymer Bulletin - - 2003
Different Crystalline Transition Behavior in Polyamides 12 16,lO 16 and 8 16
Polymer Bulletin - Tập 49 - Trang 387-394 - 2003
Crystalline transition behavior of polyamides 12 16, 10 16 and 8 16 was studied systematically by variable-temperature WAXD and real-time FTIR. It is surprising that the crystalline transition behavior of these polyamides is different from one another. Brill transition was observed before melting on heating for nylon 8 16 in both single crystal and melt-crystallized samples. For nylon 12 16, Bril......
Synthesis and polymerization of 1,5-bis(N-carbazolyl)pentane with its structural and behavioral highlights
Polymer Bulletin - Tập 77 - Trang 1205-1216 - 2019
Carbazole, the well-known electron donor and hole-transporting organic light-emitting molecule was modified into 1,5-bis[N-carbazolyl]pentane (1,5-BNCP) by introducing the saturated pentane spacer. Such insertion fixed the certain space between growing polymer chains and demonstrated π–π stacking effect over its morphology and structure. Its contribution in improving the thermal stability and phot......
Living carbocationic polymerization
Polymer Bulletin - Tập 31 - Trang 255-261 - 1993
Laboratory scale glass equipment was designed, assembled, and used for the continuous preparation by living cationic polymerization oftert-Cl monotelechelic polyisobutylene (PIB-Clt). The process involves the continuous feeding of controlled amounts of isobutylene (IB), a stream of premixed initiator (2-chloro-2, 4, 4-trimethylpentane, TMPCl) and electron donor (triethylamine, TEA) in methylene ch......
Orientation in uniaxially stretched plasticized atactic polystyrene
Polymer Bulletin - Tập 13 - Trang 259-262 - 1985
Fourier transform infrared spectroscopy and birefringence measurements have been used to study the changes in molecular orientation which occur on drawing of plasticized as compared to pure polystyrene (PS) at a temperature T=Tg+Cte. No influence of plasticizers on orientation can be detected whatever the interactions between small molecules and PS chains are. Comparison with previous results obta......
Characterization of the molecular heterogeneity of copolymers obtained via zwitterion by capillary zone electrophoresis
Polymer Bulletin - Tập 48 - Trang 53-57 - 2002
Using capillary zone electrophoresis has made characterizations of different copolymers obtained via zwitterionic polymerization. Results demonstrate that this technique is able to put into evidence the molecular heterogeneity of the different copolymers. Analyses were performed in less than 10 minutes using a borate buffer. To our knowledge this the first time that free-zone capillary electropho......
Polymerization temperature effects on the properties of l-lactide and ε-caprolactone copolymers
Polymer Bulletin - Tập 25 - Trang 335-341 - 1991
The large difference in reactivity of L-lactide and ε-caprolactone in ring opening polymerization with stannous octoate, leads to the formation of copolymers with blocky structures. By varying the polymerization temperature, copolymers with different average sequence lengths and molecular weights can be synthesized. It is shown that the average monomer sequence length has a large effect on the the......
Preparation, characterization and properties of liquid natural rubber with low non-rubber content via photodegradation
Polymer Bulletin - Tập 78 - Trang 559-575 - 2020
Photodegradation of natural rubber (NR) latex produced low molecular weight liquid natural rubber (LNR). During the photodegradation, organic materials particularly surfactants and non-rubbers also decomposed. The decomposition of surfactants and non-rubbers could influence the stability of the latex. Anionic and non-ionic surfactants were used to stabilize NR latex during the photodegradation. It......
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