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At the Sun's core temperature of 15.5 million K the PP process is dominant. The PP process and the CNO process are equal at around 20 MK. [1] Scheme of the proton–proton branch I reaction. The proton–proton chain, also commonly referred to as the p–p chain, is one of two known sets of nuclear fusion reactions by which stars convert ...
The proton–proton chain is more prominent in stars the mass of the Sun or less. This difference stems from temperature dependency differences between the two reactions; pp-chain reaction starts at temperatures around 4 × 10 6 K [ 3 ] (4 megakelvin), making it the dominant energy source in smaller stars.
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene . Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar .
Comparison of the energy output (ε) of proton–proton (PP), CNO and Triple-α fusion processes at different temperatures (T). The dashed line shows the combined energy generation of the PP and CNO processes within a star. Helium accumulates in the cores of stars as a result of the proton–proton chain reaction and the carbon–nitrogen ...
[2] [3] Hans Bethe and Charles L. Critchfield had shown the mechanism for stellar fusion of helium by deriving the proton-proton chain (pp-chain) in 1938. [4] Carl von Weizsäcker [5] and Hans Bethe [6] had independently derived the CNO cycle in 1938 and 1939, respectively. Thus, it was known by Gamow and others that the abundances of hydrogen ...
Chain polymerization products are widely used in many aspects of life, including electronic devices, food packaging, catalyst carriers, medical materials, etc. At present, the world's highest yielding polymers such as polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), etc. can be obtained by chain polymerization.
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Pages for logged out editors learn more. Contributions; Talk; P-p chain