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polymersource成立于1994年，是一家的高質(zhì)量建筑控制專業(yè)級的聚合物和生物聚合物的研究產(chǎn)品供應(yīng)商。polymersource的研究團(tuán)隊(duì)包括動態(tài)，主管和創(chuàng)新的科學(xué)家，在各種學(xué)術(shù)和研究機(jī)構(gòu)提供*的服務(wù)。

polymersource的科學(xué)家已經(jīng)完成了生產(chǎn)3000多嵌段共聚物，產(chǎn)品質(zhì)量得到了*的認(rèn)可。除了提供生物/聚合物，聚合物源已經(jīng)開發(fā)了基于我們的產(chǎn)品的合成和應(yīng)用知識產(chǎn)權(quán)。

Sample Name: Poly(butadiene-b-ethylene oxide)

Sample #: P18952-BdEO

(poly butadiene block rich in 1,2-addition)

Structure of 1,2-rich microstructure:

Synthesis Procedure:

Poly(butadiene[1,4- or 1,2 addition]-b-ethylene oxide)

can be prepared by the different routes as reported in the literature (ref: Macromolecules 1996, 29, 6994).

The direct synthesis of diblock copolymer using lithium counter ion in the presence of phosphazene base t-BuP₄ is reported in Macromolecules 1999, 32 (8), 2783–785. The polymers can also be successfully synthesized using the different end-functionalized polymers as investigated in our lab. These methodologies are proprietary.

Characterization:

OH-terminated polybutadiene polymer was analyzed by size exclusion chromatography (SEC) to obtain the molecular weight and polydispersity index (PDI). The final block copolymer composition was calculated from ¹H-NMR spectroscopy by comparing the peak area of the vinylic butadiene protons between about 5.0-5.4 ppm with the ethylene oxide protons at 3.6 ppm. Block copolymer PDI is determined by SEC. Note: The ¹H-NMR of 1,2-polybutadiene is composed of 1 proton signal at 5.4 ppm and 2 proton signals at 5.0 ppm. Signals due to vinylic 1,4-polybutadiene are also present at 5.4 ppm.

Solubility:

Poly(butadiene-b-ethylene oxide) is soluble in THF, CHCl₃, and toluene. The polymer has variable solubility in hexane, methanol, ethanol and water depending on its composition.

DSC thermal analysis of P18952-BdEO:

Thermal analysis of the samples was carried out on a TA Q100 differential scanning calorimeter at a heating rate of 10^oC/min.The midpoint of the slope change of the heat flow plot of the second heating scan was considered as the glass transition temperature (T_g).

The melting temperature (T_m) was taken as the maximum of the endothermic peak where as the crystallization temperature (Tc) was considered as the minimum of the exothermic peak.

貨號	品名	規(guī)格	生產(chǎn)廠家
P18952-BdEO	Poly(butadiene(1,2 addition)-b-ethylene oxide)	2g	polymersource

P18952-BdEO現(xiàn)貨供應(yīng)

我們公司zui大優(yōu)勢是強(qiáng)大的采購，

1：基本什么都能進(jìn)口，血清，抗體，耗材，還有部分限制進(jìn)口的，

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