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[求助]
誰幫我講講“接枝”“嵌段”等專業(yè)術(shù)語
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| 熱固性樹脂能用這些詞語么？比如我想改性酚醛樹脂，我想把柔性鏈引入到酚醛結(jié)構(gòu)中，如何是算接枝？如何算是嵌段？ |
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yvonne8104
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|
應(yīng)該算接枝吧 嵌段共聚物：由較長的（幾百到幾千結(jié)構(gòu)單元）M1鏈段和另一較長的M2鏈段組成的大分子，名稱中前后單體代表鏈段嵌合次序，也是單體加入聚合的次序。 接枝共聚物：主鏈由一種單元組成，支鏈由另一種單元組成，名稱中構(gòu)成大分子主鏈的單體在前，構(gòu)成支鏈的單體名稱在后。 |
2樓2012-05-29 16:00:28
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mingde: 金幣+1, ★★★很有幫助, 呵呵，看不懂。 2012-06-08 17:44:24
|
看看英文聚合物詞典里怎么解釋這個詞的吧。 Block n. A portion of a polymer molecule comprising many mer units that has at least one constitutional or configurational feature not present in the adjacent portions. Block copolymers n. (1) A copolymer with chains composed of shorter homopolymeric chains that are linked together. These ‘‘blocks’’ can alternate regularly or randomly. Such copolymers usually have some higher properties than either of the homopolymers or their physical blends. Graft copolymer n. A copolymer having branches of varying length made up of different monomer units on a common ‘‘backbone’’ chain. Odian GC (2004) Principles of polymerization. John Wiley and Sons Inc., New York. They have distinct blocks of polymer segments such as, AAAABBBBAAAABBBAAA sequencing of A and B monomers. When blocks are of different monomer species, the term block copolymer is used. (2) An essentially linear copolymer in which there are repeated segments of different chemical structure. Odian GC (2004) Principles of polymerization. John Wiley and Sons Inc., New York. Graft copolymer n. A copolymer having branches of varying length made up of different monomer units on a common ‘‘backbone’’ chain. Odian GC (2004) Principles of polymerization. John Wiley and Sons Inc., New York. Graft polymer or copolymer n. A high polymer, the molecules of which consist of two or more polymeric parts of different composition, chemically united. Such a graft copolymer may be produced, for example, by polymerization of a given kind of monomer with subsequent polymerization of another kind ofmonomer onto the product of the first polymerization. The union of two different polymers by chemical reaction between their molecular end groups or by reaction producing cross‐links between the different molecules would also produce a graft copolymer. Odian GC (2004) Principles of polymerization. John Wiley and Sons Inc., New York. |
6樓2012-05-30 14:20:24
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