For the individual steps of the growth reaction one needs only a relatively small activation energy and therefore through a single activation step ( the actual initiation reaction) a large number of olefin molecules are converted, as is implied by the term "chain reaction". 对于生长反应的每个步骤...
These monomers are multifunctional molecules that can react with each other to form homopolymers or with monomers of a different type to form copolymers. Important reaction mechanisms through which polymers are prepared are addition polymerizations, step-growth polymerizations, and ring-opening ...
(1). Structures such as these can be used to prepare block copolymers by stimulating the decomposition of one type of group in the presence of a monomer while leaving the other group intact for subsequent reaction with a second monomer. Thus thermal decomposition of the azo group at ∼ 340...
chainreaction Inthesameway,bymeansofachainreaction,onemonomermoleculeaftertheotherisadded(22000~20000monomerspersecond)untiltheactivestateisterminatedthroughadifferenttypeofreaction.Thepolymerizationisachainreactionintwoways:becauseofthereactionkineticsandbecauseasareactionproductoneobtainsachainmolecule.Thelengthofthechain...
); after 600 h of reaction, 46% of initial activity has been lost. In contrast, Pd/CNT + ZnZrOx catalyst shows superior long-term performance; the methanol yield over Pd/CNT + ZnZrOx reaches 13.5% (STYMeOH = 0.90 g g...
healthy reaction would have involved a gradual cutback in foreign lending, a gradual weakening of Asia’’s overvalued currencies and gradual shift of investments from over-inflated property sectors back to long-term export-oriented projects. Most short-term booms are brought down to earth without ...
Quantification of Residual Disease in Chronic Myelogenous Leukemia Patients on Interferon-α Therapy by Competitive Polymerase Chain Reaction Interferon-alpha (IFN-alpha) induces cytogenetic responses of variable degree in patients with chronic myelogenous leukemia (CML). We sought to establish the relationsh...
While COVID-19 could prompt investors to become more resilient and increasingly factor in ESG, there is also the possibility of emphasizing short-term gains over longer-term sustainability concerns. Environmental issues may temporarily be deprioritized. Efforts to mitigate the risk of future crises ar...
The form of this term in the denominator is suitable for initiators such as AIBN that produce radicals in pairs but will change for other types of initiator. Reaction conditions should usually be chosen such that the fraction of initiator-derived chains (should be greater than or equal to the...
predicted to delete the C-terminal 242 amino acids, including the heme-binding site, which should result in a nonfunctional protein. However, other subjects with inactivatingCYP11A1mutations are born at term and have later onset of adrenal insufficiency. Knockout of theCyp11a1gene in m...