When the amount of vinyl acetate increases from 9.5 g to 27.0 g,the output of EVA increases from 4.79 g to 10.35 g, and the molecular weight of EVA increases from 0.63×10~4 to 1.51×10~4, the VA chain content increases from 8.81% to 22.2%.
In the present work, radiation crosslinking of different branched poly (vinyl acetate) have been studied and the validity of the relationship between sol fraction and radiation dose(R (S + S~(1/2) ) = 1 /u1q0 + (p0'/q0)Rβ) to branched poly (vinyl acetate) have been confirmed.
The results showed that both ethylene production and expression of LeACO1 ,NR,LeERF2 genes could be inhibited by CaCl2 treatment, and CaCl2 + W5 /W7 treatment could prevent the inhibitory effect of Ca-C12 treatment on ethylene production and expression of LeACOl ,NR,LeERF2 genes. However, either CaCl2 or CaCl2+ W5/W7 treatment has little effect on the expression of LeACS2 gene.
Freshly harvested blueberries(Vaccinium corymbosum L.‘Duke’) and strawberries(Fragaria×ananassa Duch.‘Allstar’)were placed in jars and continuously ventilated with air or 40%, 60%, 80% or 100% O_2 for 35 and 14 days at 5℃,respectively, to investigate effects of high oxygen atmospheres on fruit respiratory rate and ethylene production.
AFM-tip-induced crystallization of poly(ethylene oxide) melt droplets
The AFM-tip-induced crystallization of poly(ethylene oxide) (PEO) melt droplets was studied.
A CaCO3 filler was treated by generally used coupling agents and a special one - ethylene-octene copolymer (POE)-g-maleic anhydride (MAH).
Thermal decomposition of poly(ethylene terephthalate)/mesoporous molecular sieve composites
The nonisothermal and isothermal degradation processes of poly(ethylene terephthalate)/mesoporous molecular sieve (PET/MMS) composites synthesized by insitu polymerization were studied by using thermogravimetric analysis in nitrogen.
The interaction between propene and molybdenum leads to the formation of surface species that, depending on the strength of their bonding to the surface, can be decomposed to ethene or coke.
The oxidation reaction of propene is in competition with that of coke or ethene deposit on the catalyst surface, which can explain the decrease of the catalyst activity and selectivity in the presence of high molybdenum loadings.
Unusual Reaction with Propyl Isocyanate of the Carbanion Generated from (Ehylthio)ethene
From 1,4-bis-[dichloro(methyl)silyl]butane and bis[(bromomagnesioethynyl)dimethylsilyl]ethyne or -ethene, 22-membered macrobicyclic highly unsaturated silahydrocarbons with an endocyclic tetramethylene bridge were synthesized.
Previously unknown pyridine-containing hexahydrobenzofuranone oximes were synthesized by reactions of 1-nitro-2-(3-pyridyl)ethene with dimedone and dihydroresorcinol, and their structure was studied by physicochemical methods.
Synthesis, characterization and swelling properties of a chemically cross-linked poly(vinyl alcohol) hydrogel
A poly(vinyl alcohol) hydrogel was prepared by coupling poly(vinyl alcohol) with epichlorohydrin as the cross-linking agent.
After degrading the PCL cores of the two kinds of nanospheres by lipase, the corresponding crosslinked poly(methyl acrylic acid) hollow spheres and crosslinked poly(vinyl alcohol) hollow spheres were obtained.
Meanwhile, the fluorescence lifetime of 2-[2-(9-ethyl-9H-carbazol-2yl)-vinyl]-quinolin-8-ol and its zinc complex showed long lifetime in benzene solution.
Poly(vinyl chloride) composite emulsion resins modified by polyurethane
Effect of substrate-dependent microbial ethylene production on plant growth
Overall, ACC proved to be the most effective substrate for ethylene production (1434 nmol/kg soil), followed by KMBA, L-MET, and CaC2 in descending order.
The changes in ethylene production and carbon dioxide exchange were described by a single-peaked curve.
After HS, the maximum of ethylene production (0.37 nl/(seedling h)) was reached within 10 min, and that of carbon dioxide production (313 μl/(seedling h)), within 45 min.
The rate of ethylene production (0.22 nl/(seedling h)), carbon dioxide production (97.7 μl/(seedling h)), and oxygen consumption (162.5 μl/(seedling h)) in the control seedlings did not change in the course of experiment.