To decrease the moisture absorption and improve the mechanical properties of linen/polypropylene（PP） composites, linen was modified with silane N-β-（trimethoxysilyl） propyl]ethylenediamine（AAPTS）, surfactant tr...To decrease the moisture absorption and improve the mechanical properties of linen/polypropylene（PP） composites, linen was modified with silane N-β-（trimethoxysilyl） propyl]ethylenediamine（AAPTS）, surfactant trimethyloctadecylalmnonium bromide（STAB）, and both AAPTS and STAB, respectively. Fourier transform infrared（FTIR） spectra showed that the linen was successfully modified and alkyl chains were attached through different treatments. The linen and PP were compounded by melt compressing. The moisture absorption of linen was decreased after STAB and AAPTS-STAB modifications. The moisture absorption, mechanical property and thermal property of the composites were also characterized. The results show that the moisture absorption of the AAPTS-modified li- nen（F1） reinforced PP（PPF1） is 8.09%, which is higher than that of the unmodified linen reinforced PP（PPF）（7.89%）. The moisture absorption of the STAB-AAPTS-modified linen（F3） reinforced PP（PPF3） is 6.58%. The tensile strengths of PPF1 and PPF3 are 33.7 and 35.8 MPa, which are improved by 22.5% and 30% compared with that of PPF（27.5 MPa）, respectively. Nevertheless, the moisture absorption of the STAB-modified linen（F2） reinforced PP（PPF2） is decreased by 22.4%, and the tensile strength is improved by 30% compared with those of PPF. Scanning electron microscopy（SEM） analysis of the fractured surface confirms the good interfacial adhesion of PPF2 compared with those of other composites. Furthermore, the 5% mass loss temperatures of the composites are all higher than 290 ℃. Thus, linen modified with STAB is a promising reinforcement for biocomposites.展开更多
Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the su...Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the surface of rod-like MA-NCC was confirmed by Fourier transfonn infrared spectrometry(FTIR). Sulfonated poly(aryl ether ether ketone ketone)(Ph-SPEEKK) was synthesized with bis(4-fluorophenyl-methanone) and 2-phenylhydroquinone as monomer. MA-NCC/Ph-SPEEKK nanocomposite membranes with different MA-NCCs content were prepared, and their properties were characterized. Compared with Ph-SPEEKK, MA-NCC/Ph-SPEEKK nanocomposite membrane showed better mechanical and thermal properties and higher proton conductivity. The proton conductivity of the composite membrane with 4%(mass fraction) MA-NCCs under 80℃ was 0.095 S/cm. And its tensile strength reached 30.3 MPa, which was 21.2% higher than that of Ph-SPEEKK pure polymer membrane.展开更多
基金Supported by the National Natttral Science Foundation of China（No.21404013）, the Science and Technology Development Plan of Jilin Province, China（Nos.20130521003JH, 20140204039 GX, 20160101323 JC）, the Changchun Science and Technology Plan Project, China（No. 14KG105）, the Open Research Fund of the State Key Laboratory of Polymer Physics and Chemistry of China and the Research Project of Science and Technology of the Education Department of Jilin Province of China During the 12th Five-year Plan Period（No.2015-78）.
文摘To decrease the moisture absorption and improve the mechanical properties of linen/polypropylene（PP） composites, linen was modified with silane N-β-（trimethoxysilyl） propyl]ethylenediamine（AAPTS）, surfactant trimethyloctadecylalmnonium bromide（STAB）, and both AAPTS and STAB, respectively. Fourier transform infrared（FTIR） spectra showed that the linen was successfully modified and alkyl chains were attached through different treatments. The linen and PP were compounded by melt compressing. The moisture absorption of linen was decreased after STAB and AAPTS-STAB modifications. The moisture absorption, mechanical property and thermal property of the composites were also characterized. The results show that the moisture absorption of the AAPTS-modified li- nen（F1） reinforced PP（PPF1） is 8.09%, which is higher than that of the unmodified linen reinforced PP（PPF）（7.89%）. The moisture absorption of the STAB-AAPTS-modified linen（F3） reinforced PP（PPF3） is 6.58%. The tensile strengths of PPF1 and PPF3 are 33.7 and 35.8 MPa, which are improved by 22.5% and 30% compared with that of PPF（27.5 MPa）, respectively. Nevertheless, the moisture absorption of the STAB-modified linen（F2） reinforced PP（PPF2） is decreased by 22.4%, and the tensile strength is improved by 30% compared with those of PPF. Scanning electron microscopy（SEM） analysis of the fractured surface confirms the good interfacial adhesion of PPF2 compared with those of other composites. Furthermore, the 5% mass loss temperatures of the composites are all higher than 290 ℃. Thus, linen modified with STAB is a promising reinforcement for biocomposites.
基金Supported by the National Natural Science Foundation of China(No.21404013)the Science and Technology Development Plan of Jilin Province, China(Nos.20160101323JC,20170101110JC,20180201075GX)+1 种基金the Project of tlie Jilin Provincial Development and Reform Commission,China(No.2018C041-1)the Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry of Chinese Academy of Sciences, and the Open Project of National & Local United Engineering Lab tor Power Battery(Northeast Nonnal University), China(No.130028822).
文摘Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the surface of rod-like MA-NCC was confirmed by Fourier transfonn infrared spectrometry(FTIR). Sulfonated poly(aryl ether ether ketone ketone)(Ph-SPEEKK) was synthesized with bis(4-fluorophenyl-methanone) and 2-phenylhydroquinone as monomer. MA-NCC/Ph-SPEEKK nanocomposite membranes with different MA-NCCs content were prepared, and their properties were characterized. Compared with Ph-SPEEKK, MA-NCC/Ph-SPEEKK nanocomposite membrane showed better mechanical and thermal properties and higher proton conductivity. The proton conductivity of the composite membrane with 4%(mass fraction) MA-NCCs under 80℃ was 0.095 S/cm. And its tensile strength reached 30.3 MPa, which was 21.2% higher than that of Ph-SPEEKK pure polymer membrane.
