戏法
发表于 2025-3-28 18:35:41
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小教堂
发表于 2025-3-28 20:46:28
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发怨言
发表于 2025-3-29 00:23:52
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LITHE
发表于 2025-3-29 05:38:29
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Pepsin
发表于 2025-3-29 09:17:21
Anionic Ring-Opening Polymerization of Carbonates and Formation of Blockcopolymers to result in high molecular weight polymers. Under suitable conditions, a ring-chain equilibrium is established, i.e., beside acyclic polymers a homologous series of cyclic oligomers is obtained. The different cyclic carbonates discussed open a variety of secondary reactions, in particular cross-li
Obligatory
发表于 2025-3-29 11:43:31
Preparation of Block Copoly(Arylene Sulphides) Utilising Preferential Polymer Formation in Polymerisof poly(1,4-phenylene sulphide)(A) and poly(2-methyl-1,4-phenylene sulphide)(B) from bis-(4-bromophenyl)sulphone by sequential reaction with copper (I) 4-bromo-2-methylthiophenoxide and copper (I) 4-bromothiophenoxide. The materials produced have been characterised by IR/NMR spectroscopy, elemental
连词
发表于 2025-3-29 15:38:12
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sparse
发表于 2025-3-29 22:02:37
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craving
发表于 2025-3-30 00:30:43
Stabilization of Poly(ethylene Terephthalate) (PET) against Hydrolysis by Carboxylic End Group Cappia polycarbodiimide and a bisepoxy compound have been used. For a proper stabilization an excess of polycarbodiimide should be added, so that newly formed carboxylic end groups are also removed. The bisepoxide used shows a relatively low reactivity towards carboxylic end groups. Sodium benzoate and t
CREST
发表于 2025-3-30 05:08:01
Graft Copolymerization of Styrene-Maleic Anhydride and CIS-Polybutadiener complexes in the propagation reactions has been confirmed. Attentions were paid to the effect of reaction parameters (agitation speed, polymerization temperature, initiator concentration, rubber content, MA content) on phase inversion, and influence of addition of MA to polymerization system on st