Thermal Treatment Effects on the Microstructure and Tensile Properties of Transparent Polyamides

Si-yuan Dong; Ping Zhu; Ji-guang Liu; Du-jin Wang; Xia Dong

doi:10.11777/j.issn1000-3304.2018.18198

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Thermal Treatment Effects on the Microstructure and Tensile Properties of Transparent Polyamides

Research Article | 更新时间：2021-01-26

- Thermal Treatment Effects on the Microstructure and Tensile Properties of Transparent Polyamides
- Acta Polymerica Sinica Vol. 50, Issue 2, Pages: 189-198(2019)
- 作者机构：
  
  1.北京服装学院材料科学与工程学院　北京 100029
  2.中国科学院化学研究所中国科学院工程塑料重点实验室北京分子科学国家研究中心　北京 100190
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18198
  CLC：
- Published：2019-2，
  
  Published Online：19 November 2018，
  
  Received：13 September 2018，
  
  Revised：25 October 2018，
扫描看全文
Si-yuan Dong, Ping Zhu, Ji-guang Liu, Du-jin Wang, Xia Dong. Thermal Treatment Effects on the Microstructure and Tensile Properties of Transparent Polyamides. [J]. Acta Polymerica Sinica 50(2):189-198(2019)
DOI：

Si-yuan Dong, Ping Zhu, Ji-guang Liu, Du-jin Wang, Xia Dong. Thermal Treatment Effects on the Microstructure and Tensile Properties of Transparent Polyamides. [J]. Acta Polymerica Sinica 50(2):189-198(2019) DOI： 10.11777/j.issn1000-3304.2018.18198.

摘要

研究了透明聚酰胺PAPACM12和PAMACM12的基本性能以及热处理对透明聚酰胺聚集态结构和应力应变行为的影响，着重分析并对比了重复单元结构相近的透明聚酰胺在聚集态结构上的差别. 示差扫描量热法(DSC)的结果表明，PAPACM12的玻璃化转变温度为135.6 °C、熔点为244.6 °C，PAMACM12的玻璃化转变温度为160 °C. 对比傅里叶变换红外光谱(FTIR)谱图的结果，PAPACM12在对应了酰胺基团变形振动的961 cm

−1

结晶谱带与PAMACM12有明显差异. 经过退火处理后，PAPACM12在一维广角X射线衍射(WAXD)曲线上出现了2个衍射峰，其晶面间距分别为0.50和0.45 nm，对应于聚酰胺的

晶型，这是冷结晶所致；PAMACM12经过热处理后仍为无定形状态. 退火后处理后PAPACM12的拉伸强度得到了改善、断裂强度下降，这也是冷结晶过程中微晶含量不断增加所致，而PAMACM12的拉伸强度和断裂强度均有所下降.

Abstract

The properties and thermal treatment effects on the microstructure and stress-strain behaviors of two transparent polyamides

poly(4

4′-aminocyclohexyl methylene dodecanedicarboxylamide (PAPACM12) and poly(3

3′-dimethyl-4

4′-aminocyclohexyl methylene dodecanedicarboxylamide (PAMACM12)

were studied in this work. Differences in microstructure and the corresponding properties between the two polymers with similar repeating units were found out

via

comparative analyses. PAPACM12 behaved as a microcrystalline polymer with a distinct glass transition temperature of 135.6 °C and a melting point at 244.6 °C. By contrast

PAMACM12 showed a higher glass transition temperature of 160 °C

as the elimination of thermal history reduced a lot its crystallinity. Besides

cold crystallization was observed for PAPACM12 during the heating process

which gave rise to an exothermic peak on the DSC curve at 174 °C. Comparing the Fourier transform infrared spectroscopy (FTIR) spectra of two polyamides

the band of 961 cm

−1

as a crystalline indicator was found present for PAPACM12 but absent for PAMACM12. This observation was consistent with the DSC results obtained above. Further

thermal treatment effects on the aggregate structure and tensile properties were investigated. Experimental results showed that quenching treatment could reduce the yield strength and elongation at break for both samples. Besides

the cold crystallization of PAPACM12 after annealing let two diffraction peaks occur on the integrated pattern of wide-angle X-ray diffraction (WAXD)

which corresponded to the

-spacings of 0.50 and 0.45 nm

respectively. These two values approximated to the ones for (100) and (010/110) lattices in the AABB-type polyamides. Moreover

the tensile strength of PAPACM12 increased while the fracture strength decreased after annealing

for cold crystallization process conduced to an improved microcrystalline formation. Differently

both tensile strength and fracture strength of PAMACM12 were decreased by annealing

but its optical transparency was barely affected.

关键词

透明聚酰胺热处理聚集态结构拉伸性能

Keywords

Transparent polyamideThermal treatmentMicrostructureTensile property

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