原子力-红外光谱定量分析聚1-丁烯／聚丙烯共混物的相区组成

doi:10.19894/j.issn.1000-0518.210098

摘要/Abstract

摘要：

在聚1-丁烯（PB）中混入聚丙烯（PP）能够调节前者的结晶行为，二者的共混物因此引起了人们的兴趣，其中关于两个组分的相容性目前还存在争议。本文首先建立PB／PP共混物组成的傅里叶变换红外光谱仪（FT-IR）定量分析方法，以1460和1378 cm^－1吸收峰的面积比来确定共混物中PB的质量分数，进而利用原子力-红外（AFM-IR）光谱与FT-IR光谱的一致性将其应用于AFM-IR谱的数据处理，以获得共混物中微相区的组成。研究发现PB质量分数为70%的PB／PP共混物发生了相分离，两个组分部分互溶，形成了富PB相和富PP相，分别含有78%和19%的PB。

关键词: 聚1-丁烯, 聚丙烯, 傅里叶变换红外光谱, 原子力-红外光谱, 相组成

Abstract:

Crystallization of poly (1-butene) (PB) can be manipulated by addition of isotactic polypropylene (PP), and therefore PB/PP blends have attracted considerable attention. Despite many studies on this system in the literature, the miscibility of the two components remains a controversy. In the present paper, we investigated the compositions of the micro phases in PB/PP blends by atomic force microscopy-infrared (AFM-IR). A Fourier transform infrared (FT-IR) quantitative analysis method was first established to determine the PB content in a PB/PP blend based on the peak area ratio of the 1460 cm^-1band to the 1378 cm^-1band, and then taking advantage of the consistency between the AFM-IR and the FT-IR spectra, the calibration was applied to extract the micro phase composition from the AFM-IR spectra acquired for the micro phases. It is found that a PB/PP blend containing 70% mass fraction of PB phase separates into a PB-rich phase and a PP-rich one, with PB mass fractions of 78% and 19%, respectively, indicating that the two components are partially miscible to one another.

Key words: Poly (1-butene), Polypropylene, Fourier transform infrared, Atomic force microscopy-infrared, Phase composition

中图分类号:

程久庚, 苏朝晖. 原子力-红外光谱定量分析聚1-丁烯／聚丙烯共混物的相区组成[J]. 应用化学, 2022, 39(02): 266-271.

Jiu-Geng CHENG, Zhao-Hui SU. Quantitative Analysis of Phase Composition of Poly (1-butene) /Polypropylene Blends by Atomic Force Microscopy-Infrared[J]. Chinese Journal of Applied Chemistry, 2022, 39(02): 266-271.

图/表 4

图1 在4000～600 cm－1（A）和1500～1300 cm－1（B）波数范围的PB和PP的FT-IR光谱

Fig.1 FT-IR spectra of PB and PP in the 4000～600 cm－1（A）and 1500～1300 cm－1（B）regions

图2 不同PB质量分数的PB／PP共混物1500～1300 cm－1区间的FT-IR谱图（A）和PB／PP共混物的FT-IR定量标准曲线（B）

Fig.2 FT-IR spectra in the 1500～1300 cm－1region of the PB／PP blends with different PB mass fractions（A）and FT-IR calibration curve for quantitative analysis of PB／PP blends（B）

图3 PB质量分数为70%的共混物的AFM高度图（A）及相应标记位置的AFM-IR谱图（谱图颜色与（A）中标记颜色一致）（B）

Fig.3 AFM height image of a PB／PP blend containing 70% PB（A）and AFM-IR spectra of different phases acquired at the positions marked with the same colour

表1 不同相区AFM-IR定量计算结果

Table 3 PB contents in different phases

相区	平行样本数	PB质量分数均值	标准差
Phase	Replicates analyzed	Average PB mass fraction／%	Std Dev
PB-rich	8	78	17
PP-rich	10	19	16

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