In-situ SAXS study on self-assembly of copolymer PS-<italic style="font-style: italic">b</italic>-PAA

Xin JIN; Jianjun WANG; Yiwen LI; Da HUANG; Chunming YANG; Fenggang BIAN; Jie WANG

doi:10.11889/j.0253-3219.2018.hjs.41.080102

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In-situ SAXS study on self-assembly of copolymer PS-b-PAA

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- In-situ SAXS study on self-assembly of copolymer PS-b-PAA
- NUCLEAR TECHNIQUES Vol. 41, Issue 8, Article number: 080102(2018)
- 作者机构：
  
  1.中国科学院上海应用物理研究所上海光源张江园区上海 201204
  2.中国科学院大学北京 100049
  3.华东理工大学上海 200237
  4.中国科学院上海高等研究院国家蛋白质中心上海 201210
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China;National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.080102
  CLC： O562.4
- Received：13 February 2018，
  
  Revised：01 April 2018，
  
  Published：2018-08
- 稿件说明：
移动端阅览
Xin JIN, Jianjun WANG, Yiwen LI, et al. In-situ SAXS study on self-assembly of copolymer PS-b-PAA[J]. Nuclear techniques, 2018, 41(8): 080102
DOI：

Xin JIN, Jianjun WANG, Yiwen LI, et al. In-situ SAXS study on self-assembly of copolymer PS-b-PAA[J]. Nuclear techniques, 2018, 41(8): 080102 DOI： 10.11889/j.0253-3219.2018.hjs.41.080102.

摘要

以嵌段共聚物聚苯乙烯聚丙烯酸（PS

3000

-PAA

5000

）（分子数分别为PS：PAA=3000：5000）为研究对象，应用变温小角X射线散射（Small-angle X-ray Scattering，SAXS）技术对其自组装过程进行了原位研究。SAXS峰位被发现随着温度的升高从

≈0.73 nm

-1

移动至低

区的

≈0.39 nm

-1

附近，同时SAXS峰的半峰宽、积分面积和强度的最大值也发生相应的转变。结果分析表明：该嵌段共聚物在128 ℃附近发生相变，相变温度跨度约为5 ℃。应用对距离分布函数（Pair Distance Distribution Function，PDDF），对SAXS数据进行拟合分析后发现：相变前为表面带有起伏的棒状体，随着温度升高棒状体出现孔洞，且棒状体变短，随后逐渐由棒状转变为带孔的球状体，并逐渐最终长大为直径30 nm左右的类球体。

Abstract

Background

Block copolymers can spontaneously self-assemble into various micro-scale morphologies under the various external fields

which have an extensive potential on the application of the electronics

information

chemistry and biology

etc. However

the self-assembly process is still a "black box"

the understanding is still limited to the evolution of morphology during the varying external conditions.

Purpose

This study aims to investigate the self-assembly behavior of Poly(styrene)-block-poly (acrylic acid) (PS-

-PAA) in the temperature field by using in-situ synchrotron radiation small-angle X-ray scattering (SAXS).

Methods

SAXS experiments were performed on the BL16B1 beamline of Shanghai Synchrotron Radiation Facility (SSRF). Energy was selected as 10 keV and the wave length is 0.124 nm. 2D SAXS patterns were recorded by Mar165 CCD with pixel size of 79 μm×79 μm. A sample-to-detector distance of 1946 mm was chosen. The temperatures of the specimens were monitored by using a Linkam thermal stage THMS600 (Linkam scientific instruments). One-dimensional integrated intensity curves were obtained from 2D SAXS patterns by self-developed software. PS-

-PAAs (PS:PAA=3000:5000) were used directly as purchased from Sigma-Aldrich Inc.

Results

The in-situ SAXS experiment shows that the center of scattering peak was shifted with increasing temperature from

≈0.73 nm

-1

≈0.39 nm

-1

which was also accompanied by the varying of full width of half maximum

integral area

and maximum value of SAXS peak. A phase transition temperature was estimated as

=128℃ and the temperature width of transition is 5℃. Pair distance distribution function was used for the analysis of SAXS data.

Conclusion

With increasing temperature

the length of particle decreased gradually and body perforated

A rod-like shape with an undulating surface exists before the phase transition. At the temperature higher than

the particle was degraded from the rod-like shape changes to a near-spherical shape still contains hole residue. The particles grow and gradually condense into a larger sphere with a diameter of~30 nm at the later stage.

关键词

Keywords

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In-situ SAXS study on self-assembly of copolymer PS-b-PAA

DOI：10.11889/j.0253-3219.2018.hjs.41.080102

摘要

Abstract

关键词

Keywords

references