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lfw055

金虫 (小有名气)

[求助] 求 一种pH响应 微球

是否有一种这样的制备条件比较成熟的微球,大小在1微米左右,在酸性条件下,微球溶胀,改变pH值,微球收缩。
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luner1803

木虫 (著名写手)

引用回帖:
8楼: Originally posted by luner1803 at 2012-10-24 09:06:53
参考一下这篇

Synthesis of Hollow CaCO3 Nanospheres Templated by Micelles
of Poly(styrene-b-acrylic acid-b-ethylene glycol) in Aqueous Solutions

里边有poly(styrene-b-acrylic acid-b-ethylene
g ...

Preparation of PEG-b-PAA.

Acrylic acid (2.18 g, 30.3mmol),AIBN(12.5mg, 0.08mmol), and PEG-CTA(475mg, 0.20mmol)were dissolved in dioxane (30 mL). The solution was deoxygen-ated by purging with Ar gas for 30 min. The polymerization was carried out at 60 C for 40 h. The polymerization mixture was dialyzed against pure water for 1 week. The diblock copolymer (PEG-b-PAA) was recovered by a freeze-drying technique (1.70 g,64.0%). TheDP of the PAAblock was estimated to be 90 fromits 1HNMRspectruminDMSO-d6. The number-averagemolecular
weight Mn(NMR) estimated from its 1H NMR and molecular
weight distribution (Mw/Mn) determined by GPC for the block
copolymer were 8.85  103 and 1.31, respectively.

Preparation of PS-b-PAA-b-PEG.

Styrene (10.4 g, 100mmol),AIBN(8.23mg, 0.05mmol), and PEG-b-PAA(1.11 g, 0.13mmol)were dissolved inDMF (100mL).The solutionwas deoxygenated by purging with Ar gas for 30 min. The polymerization was car-ried out at 60 C for 24 h. The polymerization mixture was dialyzed against acetone for 3 days and pure water for 1 day. The obtained triblock copolymer (PS-b-PAA-b-PEG) was recovered by a freeze-drying technique (2.09 g, 18.2%). The DP of the PS block was 80, as estimated by 1 H NMR in DMSO-d6.The Mn (NMR)and Mw/Mn for PS-b-PAA-b-PEG were 1.88  104 and 1.22,
respectively. The synthetic procedure is shown in Scheme 1. The
detailed characterization data are shown in the Supporting
Information.
9楼2012-10-24 09:15:11
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blueairshsh

捐助贵宾 (正式写手)

PS微球制备及销售


【答案】应助回帖

感谢参与,应助指数 +1
我有聚苯乙烯微球 可以关注我
2楼2012-10-22 22:18:54
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zhai_gq

新虫 (正式写手)

【答案】应助回帖

★ ★
感谢参与,应助指数 +1
lfw055: 金币+2, ★★★★★最佳答案, 如果要是碱性条件下微球溶胀 那就要考虑阴离子聚合物? 比如聚丙烯酸,制备尺寸均一的话那要是用反向乳液聚合或者无皂乳液聚合,但是为避免其在水中溶解,是不是又要加入交联剂,形成凝胶微球。那这聚合方法是不是得改变?改变后尺寸能否均一,有看过是ps封端的聚乙二醇大分子单体与PAA分散沉淀共聚,但是能不能有简单的单体与PAA聚合得到呢? 2012-10-27 22:25:57
你的PSt不行,不是pH敏感的。根据楼主的描述,应该是碱性聚合物,因此考虑乙烯基吡啶、DMAEMA、DMAPMA、DEAEMA等单体聚合形成的微球。
伟大的无产阶级爱情动作片鉴赏专家
3楼2012-10-23 09:14:10
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很好很求是

木虫 (著名写手)

引用回帖:
2楼: Originally posted by blueairshsh at 2012-10-22 22:18:54
我有聚苯乙烯微球 可以关注我

不要老做广告好不好
如果可以的话可以提供相关合成方法参与讨论
看过你的产品 虽然有表面官能化但是不会随着pH有明显体积变化

偶尔推销一下也就是了嘛,单反微球就必有你的广告贴,呵呵
4楼2012-10-23 10:13:01
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