Structure and Properties of Polyamide 6/Carbon Fiber Composites Modified with Inorganic Nucleating Agents

doi:10.19491/j.issn.1001-9278.2020.12.002

Abstract

Abstract:

Three types of inorganic nucleating agents， potassium titanate whisker （PTW）， Kaolin and talc， were used to prepare the PA6/carbon fiber （CF）/NA ternary composites， and their mechanical properties， dynamic mechanical properties， morphology， crystalline structure， thermal stability， non-isothermal crystallization and melting behaviors were investigated. The results indicated that the inorganic nucleating agents had little influence on the mechanical properties of the PA6/CF composites. Nevertheless， the addition of talc could greatly improve the impact properties of the composites， and their impact strength increases by 44.5 % with the addition of 2 wt% talc. Scanning electron microscopic observation showed that there were lots of fibers pulled out of the composites， and the exfoliated talc platelets were homogeneously dispersed in the PA6 matrix. Non-isothermal crystallization analysis indicated that there was a nucleating effect from these three nucleating agents， in which talc exhibited the best nucleating performance. The heterogeneous nucleation of talc could significantly improve the crystallization temperature of the composites and promoted the PA6 matrix to form a more perfect crystalline structure.

Key words: polyamide 6, carbon fiber, talc, composite, nucleating agent

CLC Number:

TQ327.3

DING Jianfeng, WANG Wei, LIU Yao, XIA Zhean, LI Xinxin∗. Structure and Properties of Polyamide 6/Carbon Fiber Composites Modified with Inorganic Nucleating Agents[J]. China Plastics, 2020, 34(12): 8-16.

Figures/Tables 11

References 25

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样品名称	拉伸强度/MPa	拉伸模量/MPa	冲击强度/ kJ·m^-2
PA6/CF	190.1±0.2	939.6±26.8	7.66±0.61
PA6/CF/PTW	175.9±1.0	904.2±31.1	7.10±0.28
PA6/CF/Kaolin	183.0±2.0	1 032.1±26.3	6.52±0.38
PA6/CF/Talc	187.0±2.3	989.6±21.0	11.07±1.44

样品名称	拉伸强度/MPa	拉伸模量/MPa	冲击强度/ kJ·m^-2
PA6/CF	190.1±0.2	939.6±26.8	7.66±0.61
PA6/CF/PTW	175.9±1.0	904.2±31.1	7.10±0.28
PA6/CF/Kaolin	183.0±2.0	1 032.1±26.3	6.52±0.38
PA6/CF/Talc	187.0±2.3	989.6±21.0	11.07±1.44

样品名称	Ф/ ℃·min^-1	T_on/℃	T_p/℃	(T_on-T_p)/ ℃
PA6/CF	5	194.1	191.2	2.9
	10	190.0	186.8	3.2
	15	187.2	183.6	3.7
	20	184.9	181.0	3.9
PA6/CF/PTW	5	193.9	191.0	2.9
	10	189.7	186.4	3.3
	15	186.8	183.1	3.7
	20	184.6	180.6	4.1
PA6/CF/Kaolin	5	194.6	191.8	2.8
	10	190.4	187.4	3.0
	15	188.0	184.4	3.7
	20	185.6	182.0	3.6
PA6/CF/Talc	5	199.8	195.7	4.1
	10	196.1	191.6	4.5
	15	193.6	188.7	4.9
	20	191.5	186.4	5.1

样品名称	Ф/ ℃·min^-1	T_on/℃	T_p/℃	(T_on-T_p)/ ℃
PA6/CF	5	194.1	191.2	2.9
	10	190.0	186.8	3.2
	15	187.2	183.6	3.7
	20	184.9	181.0	3.9
PA6/CF/PTW	5	193.9	191.0	2.9
	10	189.7	186.4	3.3
	15	186.8	183.1	3.7
	20	184.6	180.6	4.1
PA6/CF/Kaolin	5	194.6	191.8	2.8
	10	190.4	187.4	3.0
	15	188.0	184.4	3.7
	20	185.6	182.0	3.6
PA6/CF/Talc	5	199.8	195.7	4.1
	10	196.1	191.6	4.5
	15	193.6	188.7	4.9
	20	191.5	186.4	5.1

样品名称	Ф/ ℃·min^-1	T_m1/℃	T_m2/℃	ΔH_m/ J·g^-1	Χ_c/%
PA6/CF	5	215.4	218.0	42.1	21.9
	10	213.7	219.8	41.6	21.7
	15	212.8	219.9	41.2	21.4
	20	211.6	220.0	41.1	21.4
PA6/CF/PTW	5	214.8	218.5	36.4	19.4
	10	212.8	219.6	31.3	16.7
	15	211.4	220.4	29.3	15.7
	20	210.7	220.4	30.8	16.4
PA6/CF/Kaolin	5	215.1	218.5	41.3	22.1
	10	212.9	219.5	40.4	21.6
	15	211.6	219.6	40.3	21.5
	20	210.8	219.6	40.9	21.9
PA6/CF/Talc	5	-	217.8	42.9	22.9
	10	216.6	216.6	41.4	22.1
	15	215.7	219.5	40.6	21.7
	20	214.7	219.5	40.4	21.6