Structural evolution and mechanism of PP/CaCO3 composites during die drawing

doi:10.19491/j.issn.1001-9278.2022.10.001

Abstract

Abstract:

A type of high⁃strength， high⁃modulus， and lightweight polypropylene （PP）/CaCO₃ composites was prepared using a die drawing method， and the effect of die drawing on the microstructure， crystalline structure， thermal properties， and density of the composites were analyzed. Their structural evolution and corresponding mechanism during the die drawing process were studied. XRD and DSC characterization results indicated that there was a transformation from the original spherulites to fibrous crystals for the composites， and meanwhile a grain refinement took place in the die drawing process. There was a phenomenon of stress⁃induced crystallization occurring due to an increase in crystallinity. Moreover， a significant increase in the size of micro⁃voids and a remarkable decrease in density mainly occurred in the free⁃stretching process after the composites were separated from the converging flow channel wall.

Key words: die drawing, polypropylene composite, orientation, stress?induced crystallization, micro?voids

CLC Number:

TQ325.1⁺4

YU Shikang, CHEN Ke, XUE Ping, JIA Mingyin, CAI Jianchen. Structural evolution and mechanism of PP/CaCO₃ composites during die drawing[J]. China Plastics, 2022, 36(10): 1-6.

Figures/Tables 10

Fig.1. Photographs of PP/CaCO3 composite with marked location in the die

样品

拉伸强度/

MPa

断裂伸长

率/%

弯曲强度/

MPa

弯曲模量/

GPa

Tab.1. Mechanical properties of PP/CaCO3 composite billets and die⁃drawn products

Fig.2. Schematic diagram of die drawing process of PP/CaCO3 composites

Fig.3. XRD curves of PP/CaCO3 composites at different positions during die drawing

样品	2θ/（°）	半峰全宽/（°）	晶粒尺寸/nm
位置①	13.63	0.53	15.09
位置②	13.96	1.02	7.84
位置③	13.73	1.11	7.27
位置④	14.10	0.91	8.79
位置⑤	13.98	0.77	10.40

Tab.2. FWHM and crystalline size of （110）α reflection of PP/CaCO3 composites at different positions during die drawing

Fig.4. DSC curves of PP/CaCO3 composites at different positions during die drawing

样品	T_m/°C	ΔH_m/J·g^-1	X_C/%
位置①	148.2	51.25	35.0
位置②	148.6	54.77	37.4
位置③	149.5	69.02	47.2
位置④	149.4	66.47	45.4
位置⑤	149.4	68.38	46.7

Tab.3. DSC data of PP/CaCO3 composites at different positions during die drawing

Fig.5. SEM of PP/CaCO3 composites at different positions during die drawing process

Fig.6. Density of PP/CaCO3 composites at different positions during die drawing process

Fig.7. Schematic of structure evolution mechanism of PP/CaCO3 composites during die⁃drawing process

References 9

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Structural evolution and mechanism of PP/CaCO₃ composites during die drawing

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