PP-R复合材料结晶行为和低温韧性的研究
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摘要
采用熔融共混技术,在无规共聚聚丙烯(PP-R)中分别添加改性剂(苯乙烯-丁二烯-苯乙烯共聚物SBS、热塑性聚氨酯TPU、聚丙烯树脂PP(EPS30R))制备PP-R复合材料,通过差示扫描量热仪、X射线衍射仪和扫描电子显微镜分析了改性剂对PP-R复合材料结晶行为和低温韧性的影响规律。结果表明,SBS、TPU能够使PP-R的结晶度降低,诱导β晶的形成;在常温和低温下,SBS和TPU均能提高PP-R复合材料的冲击韧性,当SBS的含量为15%时,在-10℃下PP-R复合材料的冲击强度从10.54 k J/m~2增加到15.75 k J/m~2,即提高了49%,是一种理想的PP-R抗低温改性剂。
Polypropylene random(PP-R) based composites were prepared with different modified agents including styrene-butadiene block copolymer(SBS), thermoplastic urethanes(TPU), PP(EPS30R) by melt blending,respectively. The effects of the modifiers on the crystallization behavior and low temperature toughness of the PP-R composites were analyzed by differential scanning calorimetry,X-ray diffraction and scanning electron microscopy. The results show that SBS and TPU can decrease the crystallinity of PP-R composites and induce the formation of β-crystal. Under the normal and low temperature,the impact toughness of PP-R composites can be improved by SBS and TPU. When the content of SBS was 15%,the impact toughness of PP-R composites increases from 10. 54 k J/m~2 to 15. 75 k J/m~2at- 10 ℃,which increases by 49%. SBS is a kind of ideal PP-R anti low temperature modifier.
Polypropylene random(PP-R) based composites were prepared with different modified agents including styrene-butadiene block copolymer(SBS), thermoplastic urethanes(TPU), PP(EPS30R) by melt blending,respectively. The effects of the modifiers on the crystallization behavior and low temperature toughness of the PP-R composites were analyzed by differential scanning calorimetry,X-ray diffraction and scanning electron microscopy. The results show that SBS and TPU can decrease the crystallinity of PP-R composites and induce the formation of β-crystal. Under the normal and low temperature,the impact toughness of PP-R composites can be improved by SBS and TPU. When the content of SBS was 15%,the impact toughness of PP-R composites increases from 10. 54 k J/m~2 to 15. 75 k J/m~2at- 10 ℃,which increases by 49%. SBS is a kind of ideal PP-R anti low temperature modifier.
引文
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[3]吕雅,郭绍辉,郑斐,等.稀土β-成核剂对PP-R/POE共混体系力学性能的影响[J].中国塑料,2011,25(11):43-49.
[4]TANG W H,TANG J,YUAN H L,et al.Crystallization behavior and mechanical properties of polypropylene random copolymer/polyethylene-octene)blends[J].J Appl Polym Sci,2011,122(1):461-468.
[5]李美,章自寿,谭韵红,等.无规共聚聚丙烯中β-晶的增韧作用[J].中山大学学报:自然科学版,2015,54(5):62-68.
[6]王潇梦,尹晓刚,刘卫.等.PP-R管材专用料抗低温性能的研究[J].工程塑料应用,2015,43(2):20-25.
[7]张世鑫,王益龙,何昌平.挤出工艺条件对β成核剂改性PPR的影响[J].合成树脂及塑料,2015,32(1):1-5.
[8]邹敏,王琪琳,马光强,等.热处理对Ca SO4晶须/PP-R树脂复合材料力学性能的影响[J].材料热处理学报,2009,30(2):49-52.
[9]张玲,胡雄伟,盛旭敏,等.新型热塑性弹性体增韧聚丙烯的研究[J].塑料,2001,30(1):53-56.
[10]焦旗,田广华,杨坚,等.聚丙烯结晶性能研究[J].工程塑料应用,2015,43(7):109-113.
[11]付一政,安峰,曲静波,等.β晶型成核剂增韧改性聚丙烯及其共混物的力学性能与结晶行为[J].高分子材料科学与工程,2006,22(2):185-188.
[12]GREIN C,GERMAIN Y.Influnence ofβ-nucleation on the mechanical properties of isotactic polypropylene and rubber modified isotactic polypropylene[J].Polymer,2002,43:3279-3293.