Effect of Blending Sequence on Selective Distribution and Migration of Graphene Nanoplatelets in PP/PA6/SEBS Blends

doi:10.19491/j.issn.1001-9278.2021.01.006

Abstract

Abstract:

In this work， the morphology， and electrical and thermal conductivities of polypropylene （PP）/polyamide 6 （PA6）/styrene?ethylene?butylene?styrene copolymer （SEBS）/graphene nanoplatelets （GNPs） nanocomposites were investigated in terms of different blending sequences. The selective distribution and migration of GNPs in the matrix and their effects on the properties of nanocomposites were analyzed. The results indicated that in PP/PA6/SEBS/GNPs blending system， GNPs were more easily distributed in the PA6 phrase during the melt mixing process regulated by thermodynamic factors. When GNPs were added into PP at first and then blended with PA6， GNPs migrated from the PP phrase to the interface of co?continuous PP/PA6 blending domain. This facilitated the construction of thermal conductive paths at the blend interface， resulting in an enhancement in thermal conductivity of the nanocomposites. As a result， the nanocomposites achieved a thermal conductivity of 0.83 W/（m·K） with the addition of 7 wt % GNPs. Moreover， the addition of SEBS improved the interfacial compatibility between the PP and PA6 phrases and therefore eliminated the surface gaps between the two phrases.

Key words: graphene nanoplatelet, blending sequence, selective distribution, thermal conductivity

CLC Number:

TQ 325.1⁺4

CHEN Yirong, LAI Jindi, MO Yihua, DENG Jingyi, XU Ziwei, ZHANG Jingjing. Effect of Blending Sequence on Selective Distribution and Migration of Graphene Nanoplatelets in PP/PA6/SEBS Blends[J]. China Plastics, 2021, 35(1): 31-36.

Figures/Tables 10

预混物名称	PP含量/%	SEBS含量/%	GNPs含量/%
PG?1	43.75	0	7
PG?2	46.00	0	7
SG	0.00	4.5	7

Tab.1. Formulas of the premixes

样品名称	PP 含量/%	PA6 含量/%	GNPs 含量/%	SEBS 含量/%	润滑剂含量/%
GNP/PP/PA6	46.00	46.00	7	0	1
PG?1/PA6	46.00	46.00	7	0	1
SG/PP/PA6	43.75	43.75	7	4.5	1
PG?2/SEBS/PA6	43.75	43.75	7	4.5	1

Tab.2. Formulas of the samples

剪切速率/s^-1	PP剪切黏度/Pa?s	PA6剪切黏度/Pa?s
150	423.3	233.2
210	348.7	222.6
350	255.9	207.1
600	185.0	181.4

Tab.3. The viscosity of polymers at different shear rates

Fig.1. Relationship between shear rate and shear viscosity of PP and PA6 at 240 ℃

项目	表面能/ $? m J ? m - 2$
项目	$γ l v$	$γ l v d$	$γ l v p$
水	72.8	21.8	51.0
二碘甲烷	50.8	48.5	2.3

项目	表面能/ $? m J ? m - 2$
项目	$γ l v$	$γ l v d$	$γ l v p$
水	72.8	21.8	51.0
二碘甲烷	50.8	48.5	2.3

Tab.4. Surface energy parameters of water and diiodomethane

样品	20 ℃接触角/（°）		界面张力/ $m J ? m - 2$
	水	二碘甲烷	20 ℃			240 ℃
	水	二碘甲烷	$γ$	$γ d$	$γ p$	$γ$	$γ d$	$γ p$
GNPs	101.3	37.4	42.26	42.21	0.04	29.06	29.01	0.04
PP	77.0	52.7	35.07	27.0	8.07	21.87	13.8	8.07
PA6	86.4	48.3	35.24	32.38	2.86	22.04	19.18	2.86
SEBS	93.8	63.4	26.81	24.50	2.31	13.61	11.3	2.31

样品	20 ℃接触角/（°）		界面张力/ $m J ? m - 2$
	水	二碘甲烷	20 ℃			240 ℃
	水	二碘甲烷	$γ$	$γ d$	$γ p$	$γ$	$γ d$	$γ p$
GNPs	101.3	37.4	42.26	42.21	0.04	29.06	29.01	0.04
PP	77.0	52.7	35.07	27.0	8.07	21.87	13.8	8.07
PA6	86.4	48.3	35.24	32.38	2.86	22.04	19.18	2.86
SEBS	93.8	63.4	26.81	24.50	2.31	13.61	11.3	2.31

Tab.5. Surface tension between polymers and fillers

Fig.2. FESEM of PP/PA6/SEBS/GNPs nanocomposites in four kinds of blending orders

Fig.3. FESEM of etching PP/PA6/SEBS/GNPs nanocomposites in four kinds of blending orders

Fig.4. Electrical conductivity and thermal conductivity of PP/PA6/SEBS/GNPs nanocomposites in four kinds of blending orders

Fig.5. Microscopic morphology of PP/PA6/SEBS/GNPs nanocomposites in four kinds of blending orders

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