dispersion n. 1.分散,散開;散布,傳播;離散。 2.【物理學(xué)】彌散,色散;【化學(xué)】分散作用;被分散物;分散相,分散體系;【醫(yī)學(xué)】(炎癥等的)消散;【統(tǒng)計學(xué)】離中趨勢。 3.〔the D-〕 (猶太人的)離散異邦。 the dispersion of heat 熱的擴(kuò)散。 the dispersion of an assembly 集會的解散。 dispersion on the ground 炮彈在地面上的散布。
Progress on dispersion polymerization of acrylamide 分散聚合法合成聚丙烯酰胺的研究進(jìn)展
Inverse dispersion polymerization 反相分散聚合
The polymer of p - tert - butylstyrene ( tbs ) has a relative high glass transition temperature and is soluble in aliphatic solvent . it has a comprising prospect of application in many areas including the development of novel materials , theoretical research , dispersion polymerization , unpolluted paints , oil additives , and so on 對叔丁基苯乙烯聚合物具有較高的玻璃化溫度,并且能溶于脂肪烴中,使其在新型材料的開發(fā)、理論研究、分散聚合、環(huán)保油漆和油品添加劑等領(lǐng)域有廣闊的應(yīng)用前景。
The polystyrene particles with 2 . 8 micrometer mean diameter were prepared by dispersion polymerization and hollow porous micro - sphere were prepared by extraction after seeding emulsion polymerization . particles with multi - hollow structure were obtained and characterized by sem , additionally the mechanism and factor about formation of porous structure were also discussed . to prepare the biodegradable nano - particles , reversed - phase micro - emulsion and ionotropic gelation methods were used 利用分散聚合法制得了粒徑約為3 m的聚苯乙烯種子微球,再通過溶脹、交聯(lián)、種子乳液聚合及萃取處理,最后得到中空多孔的聚合微球,并討論了其成孔機(jī)理和各博士論文功能型復(fù)合超微粒子的制備研究因素的影響。
So far , although numerous synthetic routes , such as suspension polymerization , emulsion polymerization , dispersion polymerization , etc , have been developed to produce magnetic composite microspheres , there are still a lot of problems need to be resolved for preparing ideal and useful magnetic composite microspheres . these problems include low magnetic content , low efficiency of encapsulation , big size , polydispersity of particle size , the contamination of composite microspheres by some additives , etc . it is realized recently that the preparation of high quality magnetic composite microspheres relies on the breakthrough of synthesis approaches and the detail understanding of the polymerization mechanism in the presence of magnetic inorganic particles 本文針對當(dāng)前磁性復(fù)合微球磁含量低、潔凈度較差,且主要是微米級產(chǎn)品的研究現(xiàn)狀,以提高磁性復(fù)合微球磁含量、提高復(fù)合微球的潔凈度及在維持較高磁含量的基礎(chǔ)上有效減小復(fù)合微球的粒徑為主要目標(biāo),采用改進(jìn)乳液聚合法、細(xì)乳液聚合法及活性游離基dpe法三種方法制備了不同粒徑及磁含量的磁性復(fù)合微球。
Monodisperse ( coefficient of variation 5 % ) polystyrene microspheres in the size range of 1 . 0 ~ 10 m are prepared by dispersion polymerization in ethyl alcohol reaction media using polyvinylpyrrolidone ( pvp ) as a steric stabilizer and 2 , 2 ' - azobisizobutyronitrile ( aibn ) as an initiator in suitable condition 摘要以聚乙烯吡咯烷酮為分散劑、無水乙醇為反應(yīng)介質(zhì)、偶氮二異丁腈為引發(fā)劑,采用分散聚合的方法,通過優(yōu)化反應(yīng)條件,成功制備出了粒徑范圍為1 ~ 10 m不同粒徑級別的單分散(分散系數(shù)5 % )聚苯乙烯微球。