Effect of Electron Beam Irradiation on Thermal and Mechanical Properties of Polyamide Copolymer/Multiwall Carbon Nanotube Composites

doi:10.1007/s12204-018-2007-9

Abstract

Abstract: Ternary polyamide (tPA) copolymer is susceptible to degradation when it is irradiated by electron beam (e-beam), and effective methods to avoid degradation and increase gel content are highly desirable for crosslinking. Carboxylated multiwall carbon nanotube (MWCNT) is modified by hydroxyethyl acrylate (HEA) in this paper and used as a co-agent for the e-beam irradiation crosslinking of tPA copolymer. HEA modified MWCNT can function as an effective co-agent for the e-beam irradiation crosslinking of tPA copolymer to increase the gel content and improve the mechanical properties of tPA copolymer. Under an irradiation of 160 kGy, addition of 2 parts per hundred (phr) HEA modified MWCNT into tPA copolymer can increase the gel content of tPA copolymer from about 20% to 40% (mass ratio) and increase the tensile strength from 45 to 59MPa. The irradiation also affects the glass transition temperature of tPA copolymer by increasing the gel content. The results show that HEA modified MWCNT can act as a nucleating agent to increase the crystallization temperature, melting temperature and crystallinity of tPA copolymer.

Key words: electron beam (e-beam) irradiation | ternary polyamide (tPA) copolymer| multiwall carbon nanotube (MWCNT)| mechanical properties| thermal properties

摘要： Ternary polyamide (tPA) copolymer is susceptible to degradation when it is irradiated by electron beam (e-beam), and effective methods to avoid degradation and increase gel content are highly desirable for crosslinking. Carboxylated multiwall carbon nanotube (MWCNT) is modified by hydroxyethyl acrylate (HEA) in this paper and used as a co-agent for the e-beam irradiation crosslinking of tPA copolymer. HEA modified MWCNT can function as an effective co-agent for the e-beam irradiation crosslinking of tPA copolymer to increase the gel content and improve the mechanical properties of tPA copolymer. Under an irradiation of 160 kGy, addition of 2 parts per hundred (phr) HEA modified MWCNT into tPA copolymer can increase the gel content of tPA copolymer from about 20% to 40% (mass ratio) and increase the tensile strength from 45 to 59MPa. The irradiation also affects the glass transition temperature of tPA copolymer by increasing the gel content. The results show that HEA modified MWCNT can act as a nucleating agent to increase the crystallization temperature, melting temperature and crystallinity of tPA copolymer.

关键词: electron beam (e-beam) irradiation | ternary polyamide (tPA) copolymer| multiwall carbon nanotube (MWCNT)| mechanical properties| thermal properties

CLC Number:

TQ 327.9

CUI Chengwen (崔成文), CHEN Yuting (陈禹廷), ZHANG Yong* (张勇). Effect of Electron Beam Irradiation on Thermal and Mechanical Properties of Polyamide Copolymer/Multiwall Carbon Nanotube Composites [J]. Journal of Shanghai Jiao Tong University (Science), 2019, 24(1): 12-18.

References 38

[1]	CHMIELEWSKI A G, HAJI-SAEID M. Radiation technologies: Past, present and future [J]. Radiation Physics and Chemistry, 2004, 71(1/2): 17-21.
[2]	PRAMANIK N K, HALDAR R S, BHARDWAJ Y K,et al. Radiation processing of nylon 6 by e-beam for improved properties and performance [J]. Radiation Physics and Chemistry, 2009, 78(3): 199-205.
[3]	VALENTINE L. Interaction of polyamides with solvents.I. A preliminary survey of the swelling of crosslinked nylon 66 in various types of solvents [J].Journal of Polymer Science, Part A, 1957, 23(103):297-314.
[4]	LUG?AO A B, HUTZLER B, OJEDA T, et al. Reaction mechanism and rheological properties of polypropylene irradiated under various atmospheres [J]. Radiation Physics and Chemistry, 2000, 57(3/4/5/6): 389-392.
[5]	CHARLESBY A. Effect of high-energy radiation on long-chain polymers [J]. Nature, 1953, 171(4343): 167.
[6]	LAWTON E J, BUECHE A M, BALWIT J S. Irradiation of polymers by high-energy electrons [J]. Nature,1953, 172(4367): 76-77.
[7]	DADBIN S, FROUNCHI M, GOUDARZI D. Electron beam induced crosslinking of nylon 6 with and without the presence of TAC [J]. Polymer Degradation and Stability, 2005, 89(3): 436-441.
[8]	SHIN B Y, KIMJ H. Rheological and mechanical properties of polyamide 6 modified by electron-beam initiated mediation process [J]. Radiation Physics and Chemistry, 2015, 112: 88-96.
[9]	LEO C P, LINGGAWATI A, MOHAMMAD A W, et al. Effects of γ-aminopropyltriethoxylsilane on morphological characteristics of hybrid nylon-66-based membranes before electron beam irradiation [J]. Journal of Applied Polymer Science, 2011, 122(5): 3339-3350.
[10]	HUANG H, ZHANG X Y, LU H B. The chain segment motion and traps in γ-irradiation crystalline nylon 1010 [J]. Journal of Macromolecular Science, Part B, 2007, 46(6): 1105-1114.
[11]	BURILLO G, ADEM E, MU?NOZ E, et al. Electron beam irradiated polyamide-6 at different temperatures[J]. Radiation Physics and Chemistry, 2013, 84(3):140-144.
[12]	ADEM E, BURILLO G, CASTILLO L F D, et al.Polyamide-6: The effects on mechanical and physicochemical properties by electron beam irradiation at different temperatures [J]. Radiation Physics and Chemistry, 2014, 97(2): 165-171.
[13]	BERNSTEIN B S, ODIAN G, ORBAN G, et al. Radiation crosslinking of nylon 66 and poly(vinyl alcohol)[J]. Journal of Polymer Science, Part A, 1965, 3(10):3405-3412.
[14]	PRAMANIK N K, HALDAR R, NIYOGI U K, et al.Effect of electron beam irradiation on the kinetics of non-isothermal crystallization of nylon 66 [J]. Journal of Macromolecular Science, Part A, 2014, 51(4): 296-307.
[15]	PRAMANIK N K, HALDAR R S, BHARDWAJ Y K,et al. Radiation processing of nylon 6 by e-beam for improved properties and performance [J]. Radiation Physics and Chemistry, 2009, 78(3): 199-205.
[16]	PRAMANIK N K, HALDAR R S, BHARDWAJ Y K,et al. Modification of nylon 66 by electron beam irradiation for improved properties and superior performances[J]. Journal of Applied Polymer Science, 2011,122(1): 193-202.
[17]	IIJIMA S. Helical microtubules of graphitic carbon [J].Nature, 1991, 354(6348): 56-58.
[18]	SHEN Z Q, BATEMAN S, WU D Y, et al. The effects of carbon nanotubes on mechanical and thermal properties of woven glass fibre reinforced polyamide-6 nanocomposites [J]. Composites Science and Technology,2009, 69(2): 239-244.
[19]	CHIU F C, KAO G F. Polyamide 46/multi-walled carbon nanotube nanocomposites with enhanced thermal,electrical, and mechanical properties [J]. Composites,Part A, 2012, 43(1): 208-218.
[20]	LIU J, RINZLER A G, DAI H J, et al. Fullerene pipes[J]. Science, 1998, 280(5367): 1253-1256.
[21]	AJAYAN P M. Nanotubes from carbon. [J]. Chemical Reviews, 1999, 99(7): 1787-1800.
[22]	BIANCO A, PRATO M. Can carbon nanotubes be considered useful tools for biological applications? [J].Advanced Materials, 2003, 15(20): 1765-1768.
[23]	ZHANG W D, SHEN L, PHANG I Y, et al. Carbon nanotubes reinforced nylon-6 composite prepared by simple melt-compounding [J]. Macromolecules, 2004,37(2): 256-259.
[24]	ZHAO C G, HU G J, JUSTICE R, et al. Synthesis and characterization of multi-walled carbon nanotubes reinforced polyamide 6 via in situ polymerization [J].Polymer, 2005, 46(14): 5125-5132.
[25]	MENG H, SUI G X, FANG P F, et al. Effects of acidand diamine-modified MWNTs on the mechanical properties and crystallization behavior of polyamide 6 [J]. Polymer, 2008, 49(2): 610-620.
[26]	LIU H M, WANG X, FANG P F, et al. Functionalization of multi-walled carbon nanotubes grafted with self-generated functional groups and their polyamide 6 composites [J]. Carbon, 2010, 48(3): 721-729.
[27]	GHARIB-ZAHEDI M R, TAFAZZOLI M, B¨OHM M C, et al. Interfacial thermal transport and structural preferences in carbon nanotube-polyamide-6, 6 nanocomposites: How important are chemical functionalization effects? [J]. Physical Chemistry Chemical Physics, 2015, 17(22): 14502-14512.
[28]	KAYNAK C, SANKAL S. Effects of oxidative functionalization and aminosilanization of carbon nanotubes on the mechanical and thermal properties of polyamide 6 nanocomposites [J]. Journal of Thermoplastic Composite Materials, 2015, 28(9): 1321-1333.
[29]	NASEFMM, SAIDI H, DAHLAN K Z M. Preparation of composite polymer electrolytes by electron beaminduced grafting: Proton- and lithium ion-conducting membranes [J]. Nuclear Instruments and Methods in Physics Research B, 2007, 265(1): 168-172.
[30]	LIU F, DU C H, ZHU B K, et al. Surface immobilization of polymer brushes onto porous poly(vinylidene fluoride) membrane by electron beam to improve the hydrophilicity and fouling resistance [J]. Polymer,2007, 48(10): 2910-2918.
[31]	KIM H, ABDALA A A, MACOSKO C W.Graphene/polymer nanocomposites [J]. Macromolecules,2010, 43(16): 6515-6530.
[32]	IMAM M A, GOMES M G, MOURA E A B, et al.Effect of electron-beam irradiation on nylon- 6/diamond coated CNTs composite fiber [C]//Proceedings of SAMPE Tech 2013 Conference and Exhibition.Wichita, USA: Society for the Advancement of Material and Process Engineering, 2013: 1-10.
[33]	IMAM M A, JEELANI S, RANGARI V K, et al.Electron-beam irradiation effect on thermal and mechanical properties of nylon-6 nanocomposite fibers infused with diamond and diamond coated carbon nanotubes[J]. International Journal of Nanoscience, 2016,15(1/2): 1650004.
[34]	SENGUPTA R, SABHARWAL S, TIKKU V K, et al.Effect of ambient-temperature and high-temperature electron-beam radiation on the structural, thermal,mechanical, and dynamic mechanical properties of injection-molded polyamide-6, 6 [J]. Journal of Applied Polymer Science, 2006, 99(4): 1633-1644.
[35]	CHARLESBY A, PINNER S H. Analysis of the solubility behaviour of irradiated polyethylene and other polymers [J]. Proceedings of the Royal Society A, 1959,249(1258): 367-386.
[36]	SENGUPTA R, TIKKU V K, SOMANI A K, et al.Electron beam irradiated polyamide-6, 6 films. I. Characterization by wide angle X-ray scattering and infrared spectroscopy [J]. Radiation Physics and Chemistry,2005, 72(5): 625-633.
[37]	KUMAR N A, GANAPATHY H S, KIM J S, et al. Preparation of poly 2-hydroxyethyl methacrylate functionalized carbon nanotubes as novel biomaterial nanocomposites [J]. European Polymer Journal, 2008,44(3): 579-586.
[38]	SREENIVASAN K. An aqueous process to graft 2-hydroxyl ethyl methacrylate onto polyvinyl chloride through its functional group [J]. Journal of Applied Polymer Science, 2015, 74(1): 113-118.