Linen was chemically modified by oleoyl chloride（OC） and stearoyl chloride（SC） to graft fatty moietiesonto fiber via ester connections. Pyridine was used as solvent. The reaction was simplified by reacting the com...Linen was chemically modified by oleoyl chloride（OC） and stearoyl chloride（SC） to graft fatty moietiesonto fiber via ester connections. Pyridine was used as solvent. The reaction was simplified by reacting the compoundsin air at 60℃ for 6 h. Fourier transform infrared spectroscopy（FTIR） and thermal gravimetric analysis were con-ducted to characterize the treated fiber. The FTIR result confirms that the fatty portions have been successfullygrafted onto the fiber after the chemical modification. The thermal stability of the SC-modified linen（SCL） was simi-lar to that of the flax modified by oleoyl chloride（OCL）. SCL and OCL demonstrated a temperature of 5% mass loss,which was above 200 ℃ and could meet the requirements of the processing conditions for most composites. The-reafter, the SCL-reinforced unsaturated polyester（UPE） composites were prepared and characterized. The compositepresented a much better impact strength of 61.1 J/m and tensile modulus of 1.69 GPa than those of UPE with appli-cable thermal stability. SCL has been shown to be a promising choice as reinforcing material for composites.展开更多
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
文摘Linen was chemically modified by oleoyl chloride（OC） and stearoyl chloride（SC） to graft fatty moietiesonto fiber via ester connections. Pyridine was used as solvent. The reaction was simplified by reacting the compoundsin air at 60℃ for 6 h. Fourier transform infrared spectroscopy（FTIR） and thermal gravimetric analysis were con-ducted to characterize the treated fiber. The FTIR result confirms that the fatty portions have been successfullygrafted onto the fiber after the chemical modification. The thermal stability of the SC-modified linen（SCL） was simi-lar to that of the flax modified by oleoyl chloride（OCL）. SCL and OCL demonstrated a temperature of 5% mass loss,which was above 200 ℃ and could meet the requirements of the processing conditions for most composites. The-reafter, the SCL-reinforced unsaturated polyester（UPE） composites were prepared and characterized. The compositepresented a much better impact strength of 61.1 J/m and tensile modulus of 1.69 GPa than those of UPE with appli-cable thermal stability. SCL has been shown to be a promising choice as reinforcing material for composites.
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.
