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mingde

金虫 (正式写手)

[求助] 谁帮我讲讲“接枝”“嵌段”等专业术语

热固性树脂能用这些词语么?比如我想改性酚醛树脂,我想把柔性链引入到酚醛结构中,如何是算接枝?如何算是嵌段?
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yvonne8104

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dashyi: 金币+1, 欢迎交流 2012-05-29 17:50:32
mingde: 金币+6, ★★★很有帮助 2012-05-29 21:20:12
应该算接枝吧
嵌段共聚物:由较长的(几百到几千结构单元)M1链段和另一较长的M2链段组成的大分子,名称中前后单体代表链段嵌合次序,也是单体加入聚合的次序。
接枝共聚物:主链由一种单元组成,支链由另一种单元组成,名称中构成大分子主链的单体在前,构成支链的单体名称在后。
2楼2012-05-29 16:00:28
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dragon2363

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dashyi: 金币+1, 欢迎交流 2012-05-29 17:50:39
mingde: 金币+6, ★★★很有帮助 2012-05-29 21:20:19
算吧!
接枝graft:链A上接链B  如  ~AAAAAAAA~
                                                ︱
                              BBBBB~
嵌段block:A段中嵌入B段  如~AAAAAABBBBAAAAAABBBBBAAAAA~等形式
3楼2012-05-29 16:50:27
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周国梁

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金虫

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dashyi: 金币+1, 欢迎交流 2012-05-29 17:50:45
mingde: 金币+6, ★★★很有帮助 2012-05-29 21:20:29
接枝呀,接枝:比如说马来酸酐接枝PP就是以PP为主链然后通过化学方法将马来酸酐接枝成为侧链。接枝料的接枝率都比较小的。嵌段共聚物就是主链上有一段聚合是不同的,比如说聚苯乙烯丁二烯就是的
4楼2012-05-29 17:35:09
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kfmfh

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mingde: 金币+1, 有帮助 2012-06-08 17:44:04
接枝和嵌段共聚物是指对于线型聚合物来说的,酚醛树脂应该是体型聚合物,接枝聚合和嵌段聚合都有着明确的单体聚合过程。
努力挣钱缴税,感觉很光荣:(:(:(:(
5楼2012-05-30 12:08:50
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Pureland

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mingde: 金币+1, ★★★很有帮助, 呵呵,看不懂。 2012-06-08 17:44:24
看看英文聚合物词典里怎么解释这个词的吧。

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楼2012-05-30 14:20:24
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