核壳乳液聚合

Company name
核壳乳液聚合的核壳结构
单体液滴
单体液滴
种子胶乳
单体、乳化剂分别处在水溶液、 胶束、液滴三相中的示意图
Company name
影响核壳乳液聚合的因素
根据核和壳单体的不同，正常的核壳聚合物基本上 有两种类型： 硬核软壳型：这类聚合物主要用作涂料。 软核硬壳型：调节玻璃化温度或最低成膜温度。以 丁二烯﹑丙烯酸丁酯等软单体，经乳液聚合后为种 子，甲基丙烯酸甲酯﹑苯乙烯﹑丙烯睛等为硬单体， 后来加入继续聚合，就成为硬壳层。以B（聚丁二烯） 为核，S（苯乙烯）和A（丙烯氰）共聚物为壳，就 成了著名的ABS工程塑料。
the optimal conditions
the ratio of SDS to OP-10 was 1:2, total dosage was 8%; the dosage of initiator was 0.25 g, including 0.15g in seeded polymerization process and 0.1g in shell polymerization process; the functional monomer dosage was 7.5 g.
Company name
影响核壳乳液聚合的因素
核壳乳液粒子构成机理 接枝机理 一种单体在另一种聚合物存在下进行聚合时，在适当 的条件下，会多去聚合物上的活泼氢原子而发生接枝 共聚。如St-BA核壳乳液聚合
互穿聚合物网络机理 两种聚合物分子链相互贯穿并以化学键的方式各自交 联而成的网络结构 离子键合机理——不同电荷的相互作用
Company name
核壳乳液聚合的应用举例（1） 多层特种结构聚合物乳胶粒子
递变进料、单体A单体B、洋葱 当R0：R1=1：2，内部富含B外部富含A的核壳聚合物； 当R0»R1，无规共聚物；当R0«R1，典型的B核A壳聚合物
Company name
LOGO
核壳乳液聚合的应用举例（2）
Leabharlann Baidu
synthesis and application of anionic acrylic（阴离子 丙烯酸） emulsion used as paper wet-strength additive
From
4th International Conference on Pulping, Papermaking and Biotechnology
Your site here
LOGO
Contents
1. Abstract 2. Introduction 3. Experienment
4. Results and discussion 5. Conclusion
Your site here
Results and discussion
During seed reaction stage, when emulsifier dosage was 3%, the monomer conversion rate was the lowestof all; During core reaction stage, as the reaction went on, the monomer conversion rate increased fast,especially the emulsifier dosage 3% increased significantly; During shell reaction stage, the conversion rate increased slowly; At the end of reaction, the conversion rates of four different emulsifier dosages system were almost the same, which could all reach more than 99%
Your site here
LOGO
Abstract
used as wet strength agent
single use of APSBM（苯乙烯-丙烯酸丁酯-α-甲基丙烯酸） was not good simultaneous use of 0.3% APSBM and 0.7% PAE showed great improvement of wet strength to 38% SEM photographs showed that the appearance of paper treated with 0.7% PAE and 0.3% APSBM had a close crosslinking（交联）
Your site here
LOGO
Experienment
Paper sheets preparation and analysis
hardwood bleached kraft pulp(HBKP)（阔叶木漂白硫酸盐浆） 80 g/m2 basis weight Wet tensile strength and folding endurance
Seed（种子聚合） emulsifier, buffer and distilled water mixed seed monomers, potassium peroxydisulfate（过硫酸钾） Core （核聚合） core monomers which were well pre-emulsified Shell（壳聚合） well pre-emulsified shell monomers
Emulsion characterization
observation of emulsion’s state,viscosity and color; the solid content, conversion mechanical stability, ionic stability, pH stability and storing stability (one month)
as to improve the properties of emulsion acrylate copolymer（丙烯酸共聚物） emulsion with coreshell structure was prepared using styrene (St) （苯乙烯） as hard monomer and butyl acrylate (BA) （丙烯酸丁酯）as soft monomer.
Your site here
LOGO
Experienment
A constitutional formula synthesized by St（苯乙烯） ,BA（丙烯酸丁酯） and α-MAA（甲基丙烯酸）
Your site here
LOGO
Experienment
Copolymer synthesis
Your site here
LOGO
Introduction
1/environmental-friendly products-MF（脲- 甲醛树脂）/UF （三聚氰胺一甲醛树脂）/PAE（聚酰胺环氧氯丙烷）
2/excellent penetrability（渗透性）, affinity（亲和力）, and film forming ability;it can disperse in water without organic solvent 3/some disadvantages: high temperature of film forming, lower rigidity（刚度）, tending to get soft, poor water resistance（抗水性） of cured（熟化） film, ect 4/One solution to solve above mentioned problemsis to develop special structure of particles called core-shell structure （核壳结构）of the polymer particles
Related imformation
Title
synthesis and application of anionic acrylic emulsion（阴离 子丙烯酸） used as paper wet-strength additive
Authors
Xin Liu, Chunhua Tian, Yuying Wu, Xueming Zhang College of Materials Science and Technology, Beijing Forestry University
核壳乳液聚合
核壳乳液聚合
1
什么是核壳乳液聚合 核壳乳液聚合的核壳结构 影响核壳乳液聚合的因素 核壳乳液聚合运用举例
2 3 4
Company name
什么是核壳乳液聚合
核壳乳液聚合
核壳乳液聚合是种子乳液聚合的发展。 若种子聚合和后继聚合采用不同单体，则形成核 壳结构的胶粒，在核与壳的界面上形成接枝层， 增加两者的相容性和粘结力，提高力学性能。 在总配比完全相同的情况下，因为组分性质的差 异，采用种子乳液聚合的方法，控制不同的加料 顺序和条件，可以得到结构形态不同的核壳乳胶 粒子。 与普通乳液乳液聚合相比，它有显著的优越性， 如在流变性、最低成膜温度、玻璃转化温度、抗 张强度、粘接性能、加工性等方面有显著的特点。
Company name
影响核壳乳液聚合的因素
壳层物质的加料方法不同， 形成的核壳结构和核壳间结合方式也差别很大。
间歇法：壳单体 一次性加入，在 引发剂存在下引 发聚合，这种方 法也使乳胶粒表 面单体浓度很高。
Company name
影响核壳乳液聚合的因素
影响核壳结构的因素除了两中单体的加料次序外，还 与单体的亲水性有关。 一般乳液聚合都以水为分散介质，亲水性较大的聚合 物易和介质水接近，而疏水性倾向于排斥介质水，因 而形成不同结构形态的胶乳粒子。 正常结构和非正常的结构形态(如翻转形等)乳胶粒。
background
Your site here
LOGO
Introduction
idea
a new concept of "particle design", that is, changing the structure of latex（胶乳） particles through designing the composition of core and shell structures of latex particles
Your site here
LOGO
LOGO
Thank You!
Results and discussion
1/more than 98% 2/as the amount of SDS increased, the flocculation of emulsion significantly increased and the storing stability reduced,also the emulsion began to layer. 3/same charge causes the bonding of the emulsifier molecules and latex particles to decline. LOGO
Your site here
LOGO
Abstract
polymerization
butyl acrylate (BA) as soft monomer, styrene (St) as hard monomer sodium dodecyl sulfate (SDS) and dodecyl polyoxy ethylene (OP-10) as emulsifiers under nitrogen 丙烯酸丁酯、苯乙烯、十二烷基硫酸钠、烷基酚聚氧乙烯醚
Company name
什么是核壳乳液聚合
少量单体先形成种子胶乳
少量单体先形成核结构部分
后继的正式聚合采用同一种单体
后继聚合采用不同单体
使粒子长大
形成核壳结构
种子乳液聚合
核壳乳液聚合
Company name
核壳乳液聚合的核壳结构
乳胶粒的核壳结构： 在乳胶粒的中心附近是一 个富聚合物的核，其中聚 合物含量大而单体含量少。 在核的外围是一层富单体 的壳;在壳表面上吸附乳化 剂分子而成一单分子层， 以使该乳胶粒稳定的悬浮 在水相中。 在核与壳的界面上，分布 有正在增长的或失去活性 的聚合物末端，聚合反应 就是发生在这个界面上。