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Effects of Different Compatibilizers on Structure and Properties of PA6/ABS Blends

Author: LiDan
Tutor: HuangBoFen
School: Nanchang University
Course: Materials Science
Keywords: PA6/ABS blends maleic anhydride grafted ethylene-butylacrylate coplymer (EBA-g-MAH) Ethylene-butyl acrylate-glycidylmethacry-late coplymer(PTW) Structure Properties
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 258
Quote: 1
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Abstract

In this thesis, PA6/ABS blends were produced using maleic anhydride grafted ethylene-butyl acrylate coplymer(EBA-g-MAH) as anhydride compatibilizer and ethylene-butylacrylate-glycidylmethacrylate coplymer (PTW) as exopy compatibilizer. The compatibility and compatibilization reaction were observed by molau test and FT-IR; the morpholgy strucute,crystallization properties and thermal stabilityof PA6/ABS blends were investigated by sanning electron microscope(SEM), differential scanning calorimeter(DSC) and thermo gravimetric analyser;the effect of ABS and compatibilizer on crystallization temperature、melting temperature and degree of crystallinity by using of DSC;the change of nylon6’s thermal stability of blends was studied using thermo gravimetric analysis (TGA);the infulence of anhydride compatibilizer EBA-g-MAH and exopy compatibilizer PTW on the heat deformation temperature、tensile strength、impact strength、rheological property and water absorption of PA6/ABS blends were studied,the results of compatibilization were compared and compatibilizing mechanism.of compatibilizers were analyzed.The analysis of Molau test、FT-IR and SEM were showed that PA6/ABS blends were just only simple mechanical blending,the binary phase were immisicible and the size of ABS wasn’t well-distributed;while EBA-g-MAH or PTW can increase compatibility of PA6/ABS blends through interfacial chemical reaction,the resulting copolymer located at the interfacial and increased interfacial adhesison between nylon6 and ABS phase.The results of DSC showed that plain PA6 had a and Y crystal, and the crystal of PA6 weren’t transformated by addition of ABS、EBA-g-MAH and PTW,while the crystallization of PA6 were depressed. The resutlts of TGA showed that heat resistance of PA6/ABS/EBA-g-MAH and PA6/ABS/PTW ternary blends were more than that of PA6/ABS binary blends, and the content of EBA-g-MAH has a little effect on the heat resistane of PA6/ABS blends, while the content of PTW had pronounced effect on the heat resistance of PA6/ABS blends.When the content of PTW is 8 wt%, PA6/ABS/PTW ternary blends was much more than the heat resistance of PA6.The heat distortion temperature of PA6/ABS blends were improved by addition of EBA-g-MAH and PTW, respectively.When the ratio of PA6/ABS/EBA-g-MAH was 90:10:15,the heat distortion temperature of ternary blends was 87℃,which was higher 58 percent than PA6/ABS binary blends and higher 74 percent than 74%. When the ratio of PA6/ABS/PTW was 90:10:12, the heat distortion temperature of ternary blends was 90℃,which was higher 63 precent than PA6/ABS binary blends and higher 80 percent than PA6.The impact strength of PA6/ABS blends were respectively improved by EBA-g-MAH and PTW, while the tensile strength of PA6/ABS blends were decreased.When the ratio of PA6/ABS/EBA-g-MAH was 90:10:25,the impact strength of PA6/ABS/EBA-g-MAH ternary blends,was higher 374 percent than PA6/ABS binary blends, and higher 426 precent than PA6.When the ratio of PA6/ABS/PTW was 90:10:20, the impact strength of PA6/ABS/PTW ternary blends, was higher 206 percent than PA6/ABS binary blends, and higher 239 percent than PA6.The melting flow rate of PA6/ABS were reduced by addition of EBA-g-MAH and PTW, respectively, but water absorption of blends were decreased.The comprehensive properties of PA6/ABS blends compatibilized by EBA-g-MAH were better than that of PTW.PA6/ABS blends had an efficient compatiblization by addtion EBA-g-MAH or PTW,their compatibilizing mechanism is:one end group was ethylene which was miscible with ABS, and the other end group(MAH or GMA) was capable of reacting with-N-H group or-COOH-group,these in situ-formed copolymers during melt blending tended to stay at the interface as the reaction between functional groups occured at the interface, reduceing interfacial tension between the binary phases, and thus acedt as effective compatibilizers between PA6 and ABS.But these two different kinds of compatiblized had different effects on PA6/ABS peroperties due to different reacting groups.

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