Study on Rheological Behaviors of Polypropylene/Propylene⁃ethylene Copolymer Blends

doi:10.19491/j.issn.1001-9278.2020.05.003

Abstract

Abstract:

The rheological behaviors of fiber?grade polypropylene (PP)/propylene?ethylene copolymer (PEC) blends were studied by a capillary rheometer and rotational rheometer, and the effects of shear rate, temperature and blend composition on the rheological behaviors were analyzed. The results indicated that PP, PEC and their blends exhibited a shear?thinning behavior with an increase of shear rate. However, with the increase of temperature, the apparent viscosity of the blends gradually decreased especially at low shear rates. On the other hand, the non?Newton index of the blends tended to increase with an increase of PEC content, but their viscous flow activation energy decreased. This indicated that the sensitivity of viscosity to temperature decreased, and the melt shear modulus and melt elasticity increased.

Key words: fiber?grade polypropylene, propylene?ethylene copolymer, blend, rheological behavior

CLC Number:

TQ325.1⁺4

Cheng GUO, Zongli MA, Fengbo ZHANG, Xingbo SHI, Yanfang WANG, Shangtao CHEN, Xiaoyu MENG, Gongchen YAN. Study on Rheological Behaviors of Polypropylene/Propylene⁃ethylene Copolymer Blends[J]. China Plastics, 2020, 34(5): 16-20.

Figures/Tables 8

样品编号	PP含量/g	PEC含量/g	抗氧化剂1010 含量/×10^-4g	抗氧化剂168 含量/×10^-4g
PP	500	0	5	10
PP/10 % PEC	450	50	5	10
PP/20 % PEC	400	100	5	10
PP/30 % PEC	350	150	5	10
PEC	0	500	5	10

Tab.1. Formula of samples

Fig.1. lgγ˙?lgη curves of PP/PEC blends

Fig.2. lgγ˙?lgη curves at different temperatures

Fig.3. lgτ?lgγ˙ curves of PP/PEC blends

温度/℃	n值
温度/℃	PP	PP/10 %PEC	PP/20 %PEC	PP/30 %PEC	PEC
190	0.452	0.459	0.465	0.471	0.511
210	0.504	0.514	0.524	0.536	0.577
230	0.562	0.565	0.574	0.578	0.624

Tab.2. Newtonian index of PP/PEC blends

Fig.4. lnη?（1/T）×103 curves of PP/PEC blends

$r ˙$ /s^-1	ΔE /kJ·molˉ¹
$r ˙$ /s^-1	PP	PP/10 % PEC	PP/20 % PEC	PP/30 % PEC	PEC
150	24.14	22.83	22.53	23.64	20.11
400	16.49	15.83	16.20	16.23	13.49
1 500	10.53	9.62	9.57	9.84	4.92

$r ˙$ /s^-1	ΔE /kJ·molˉ¹
$r ˙$ /s^-1	PP	PP/10 % PEC	PP/20 % PEC	PP/30 % PEC	PEC
150	24.14	22.83	22.53	23.64	20.11
400	16.49	15.83	16.20	16.23	13.49
1 500	10.53	9.62	9.57	9.84	4.92

Tab.3. Flow activation energy of PP/PEC blends

Fig. 5. The ω ? G′，G" and tanδ curves of PP/PEC blends

References 13

1	段宏义, 邓守军, 高青松,等. 卫生材料用聚丙烯纤维流变行为研究[J].合成材料老化与应用, 2018, 47(5):27⁃29.
	DUAN H Y, DENG S J, GAO Q S, et al. Rheological Behavior of Polypropylene Fibers for Sanitary Materials[J]. Aging and Applications of Synthetic Materials, 2018, 47(5): 27⁃29.
2	王松杰, 张晓黎, 申长雨,等. 聚丙烯剪切流变测试与分析[J]. 现代塑料加工应用, 2010, 22(2):53⁃54.
	WANG S J, ZHANG X L, SHEN C Y, et al. Shear Rheological Test and Analysis of Polypropylene[J]. Modern Plastics Processing Application, 2010, 22(2): 53⁃54.
3	ZHANG K, LIU P, WANG W J, et al. Preparation of Comb⁃Shaped Polyolefin Elastomers Having Ethylene/1⁃Octene Copolymer Backbone and Long Chain Polyethylene Branches via a Tandem Metallocene Catalyst System[J]. Macromolecules, 2018, 51(21): 8 790⁃8 799.
4	LIU G, ZHANG X, LI X, et al. Correlation of Miscibility and Mechanical Properties of Polypropylene/Olefin Block Copolymers: Effect of Chain Composition[J]. Journal of Applied Polymer Science, 2012, 125(1): 666⁃675.
5	KONTOPOULOU M, WANG W, GOPAKUMAR T G, et al. Effect of Composition and Comonomer Type on the Rheology, Morphology and Properties of Ethylene⁃α⁃Olefin Copolymer/Polypropylene Blends[J]. Polymer, 2003, 44(24): 7 495⁃7 504.
6	QI L, WU L, HE R, et al. Synergistic Toughening of Polypropylene with Ultra⁃High Molecular Weight Polyethy⁃lene and Elastomer⁃Olefin Block Copolymers[J]. RSC Advances, 2019, 9(41): 23 994⁃24 002
7	LI Y, LI Y, HAN C, et al. Morphology and Properties in the Binary Blends of Polypropylene and Propylene–Ethylene Random Copolymers[J]. Polymer Bulletin, 2019, 76(6): 2 851⁃2 866.
8	YING J, XIE X, PENG S, et al. Morphology and Rheology of PP/POE Blends in High Shear Stress Field[J]. Journal of Thermoplastic Composite Materials, 2018, 31(9): 1 263⁃1 280.
9	TARASHI S, NAZOCKDAST H, JAVIDI Z, et al. Long⁃Chain Branch⁃Induced Interfacial Interaction and Its Effect on Morphology Development in Polypropylene/Ethy⁃lene Octene Copolymer Blend[J]. Journal of Materials Science, 2019, 54(8): 6 742⁃6 751.
10	YAO G, FANG Y, CHI E, et al. The Influence of Space Restriction on the Mechanical Properties of Isotactic Polypropylene/Reduced Graphene Oxide Nanocomposite Injection Bars[J]. Polymer Science, Series A, 2018, 60(5): 663⁃670.
11	SHAO H, WANG S, DONG X, et al. Rheological Behaviors of Polypropylene/Poly (1⁃Butene) Blends[J]. Journal of Macromolecular Science, Part B, 2018, 57(9): 608⁃623.
12	张如心, 张顺花, 杨勉. 壳聚糖/聚丙烯共混熔体的剪切流变性能[J]. 现代纺织技术, 2016, 24(5):1⁃4.
	ZHANG R X, ZHANG S H, YANG M. Shear Rheological Properties of Chitosan/Polypropylene Blend Melts[J]. Modern Textile Technology, 2016, 24(5): 1⁃4.
13	王蕾, 胡国胜, 王标兵. PP／POE／T⁃ZnOw复合材料流变行为的研究[J]. 中国塑料, 2010, 24(10):66⁃70.
	WANG L, HU G S, WANG B B. Rheological Behavior of PP / POE / T⁃ZnOw Composites[J]. China Plastics, 2010, 24(10): 66⁃70.

[1]	LI Kaize, XIN Yong. Properties of thermoplastic polyurethane composites modified with carbon nanotubes [J]. China Plastics, 2022, 36(6): 1-5.
[2]	WANG Fuyu, GUO Jinqiang, ZHANG Yuxia. In⁃situ fibrillation methods of polymer blends and their application in PP⁃based blends [J]. China Plastics, 2022, 36(3): 146-156.
[3]	LI Zeyang, CEN Lan, CHEN Sheng, CHEN Weijie, DU Binghua, ZHANG Ershuai. Preparation and properties of XNBR/PA12 thermoplastic elastomer [J]. China Plastics, 2022, 36(3): 15-20.
[4]	CHENG Manfang, BAI Jifeng, WANG Wenqing, LEI Liangcai, LI Haiying, HAN Xiangyan, HU Yuexin. Preparation and characterizations of polymeric ionic liquid blending system based on hyperbranched poly（p⁃chloromethylstyrene） [J]. China Plastics, 2022, 36(3): 40-47.
[5]	LI Qiwei, WANG Cuicui, ZHENG Haijun, CHEN Jihe, WANG Ge, CHENG Haitao. Effects of multiple extrusions on mechanical and foaming properties of polypropylene/bamboo fiber composites [J]. China Plastics, 2022, 36(2): 56-60.
[6]	WANG Fei, LIU Lichao, XUE Ping. Study on mechanical properties and crystal structure of melt⁃spun PE⁃UHMW/PE⁃HD fibers [J]. China Plastics, 2022, 36(1): 47-52.
[7]	ZHANG Ting, ZHANG Caili, SONG Xinyu, WENG Yunxuan. Research Progress in Preparation and Applications of PBAT Films [J]. China Plastics, 2021, 35(7): 115-125.
[8]	ZHANG Yaocheng, WU Yongzhen, LI Yang, ZHAO Zhu, WANG Guosheng, DING Xuejia. Gimini Quaternary Ammonium Salt⁃modified PVC⁃based Antibacterial Materials for Medical Use [J]. China Plastics, 2021, 35(7): 53-57.
[9]	JIANG Guo, LU Wanxia, ZHANG Shuidong. Effect of Modified Thermoplastic Starch （TPS） on Rheology， Morphology and Mechanical Properties of PPC/TPS Composites [J]. China Plastics, 2021, 35(6): 1-6.
[10]	WANG Conglong, ZHANG Yihui, WANG Xiangdong, XU Haiyun. Current Statue in Preparation and Research of Thermoplastic Polyether Sulfone and Polyetherimide Foam [J]. China Plastics, 2021, 35(2): 132-142.
[11]	YUAN Zhihuan, KUANG Tangqing, LAI Jiamei, LIU Hesheng, XU Pan. Influence of Processing Parameters on Wall Thickness and Properties of Water⁃assisted Co⁃injection Molding Pipes of Polypropylene/Polyamide 6 Blends [J]. China Plastics, 2021, 35(11): 77-83.
[12]	TAN Bowen, SUN Zhaoyang, JI Yang. A Review in Synthesis and Modification of Poly（glycolic acid） [J]. China Plastics, 2021, 35(10): 137-146.
[13]	CHEN Yirong, LAI Jindi, MO Yihua, DENG Jingyi, XU Ziwei, ZHANG Jingjing. Effect of Blending Sequence on Selective Distribution and Migration of Graphene Nanoplatelets in PP/PA6/SEBS Blends [J]. China Plastics, 2021, 35(1): 31-36.
[14]	LI Niexin, LI Minggang, TANG Tao, WANG Yi, XING Haiping. Effect of Phase Structure on Foam Structure of PBE/EVA Composite under CO₂ Batch Foaming [J]. China Plastics, 2020, 34(9): 1-8.
[15]	Jingyun LUO, Shijian BAI, Yuxia ZHANG, Hongfu ZHOU. Research Progress in Rheological Behavior of Poly(lactic acid) Nanocomposites [J]. China Plastics, 2020, 34(9): 103-110.