过氧化物交联增韧改性PE⁃HD/POE共混物

doi:10.19491/j.issn.1001-9278.2020.10.001

中国塑料 ›› 2020, Vol. 34 ›› Issue (10): 1-5.DOI: 10.19491/j.issn.1001-9278.2020.10.001

• 材料与性能 • 下一篇

过氧化物交联增韧改性PE⁃HD/POE共混物

张忠峰¹, 刘顺城¹, 王克俭¹(), 任月庆², 陈兰兰², 孙小杰², 梁文斌²

^1.北京化工大学机电工程学院，北京 100029
^2.北京低碳清洁能源研究院，北京 102211

收稿日期:2020-06-08 出版日期:2020-10-26 发布日期:2020-10-26

Toughening Modification of PE⁃HD/POE Blends by Crosslinking with Peroxide

ZHANG Zhongfeng¹, LIU Shuncheng¹, WANG Kejian¹(), REN Yueqing², CHEN Lanlan², SUN Xiaojie², LIANG Wenbin²

^1.College of Mechanical and Electrical Engineering，Beijing University of Chemical Technology，Beijing 100029，China
^2.National Institute of Clean?and?Low?Carbon Energy，Beijing 102211，China

Received:2020-06-08 Online:2020-10-26 Published:2020-10-26
Contact: WANG Kejian E-mail:wangkj@mail.buct.edu.cn

摘要/Abstract

摘要：

采用过氧化物交联剂对高密度聚乙烯（PE-HD）/乙烯-辛烯共聚物（POE）共混物进行交联。测试了交联PE-HD/POE的凝胶含量；通过旋转流变仪和差示扫描量热仪（DSC）分析了交联对PE-HD/POE共混物的流变和结晶的影响；表征了拉伸性能和冲击性能；观察了冲击断面的扫描电子显微镜（SEM）照片。结果表明，交联提高了共混物的复数黏度，抑制了其结晶，导致结晶度下降，晶片变薄；当过氧化物交联剂（BIPB）含量为0.3 %（质量分数，下同）时，交联PE-HD/POE的缺口冲击强度达到了61.1 kJ/m²，断裂伸长率超过900 %；交联度低时，交联共混物大部分分子链仍能自由移动，增韧模式为低缠结度产生大变形形成剪切屈服带抵消冲击能量，交联度高时，分子链移动受限，增韧模式为高缠结度产生大量小形变耗散冲击能量，且后者具有更好的增韧效果。

关键词: 过氧化物交联, 高密度聚乙烯, 乙烯-辛烯共聚物, 增韧改性, 断面形貌

Abstract:

The PE-HD/POE blends were modified by crosslinking with BIPB as a peroxide crosslinking agent. The gel content of the crosslinked PE-HD/POE was analyzed， and the effect of crosslinking modification on the rheology and crystallization of PE-HD/POE blends were investigated by rotary rheometer and DSC. The tensile and impact properties were characterized， and impact fracture surfaces were observed by SEM. The results indicated that the crosslinking modification increased the complex viscosity of the blends and inhibited their crystallization， resulting in a decrease in crystallinity and thinner wafers. When 0.3 wt % of BIPB was added， the notched impact strength of the blends reached 61.1 kJ/m²， and their elongation at break exceeded 900 %. When the crosslinking degree was low， most of the molecular chains in the blends could move freely. The toughening mode was attributed to the low entanglement that produces large deformation to form a shear yield zone to offset the impact energy. With the improvement of crosslinking degree， the toughening mode was converted to the high entanglement that generated a large amount of small deformation to dissipate the impact energy at a high cross-linking degree， leading to a better toughening effect.

Key words: peroxide crosslinking, high-density polyethylene, ethylene-octene copolymer, toughening modification, section morphology

中图分类号:

TQ 325.1⁺2

张忠峰, 刘顺城, 王克俭, 任月庆, 陈兰兰, 孙小杰, 梁文斌. 过氧化物交联增韧改性PE⁃HD/POE共混物[J]. 中国塑料, 2020, 34(10): 1-5.

ZHANG Zhongfeng, LIU Shuncheng, WANG Kejian, REN Yueqing, CHEN Lanlan, SUN Xiaojie, LIANG Wenbin. Toughening Modification of PE⁃HD/POE Blends by Crosslinking with Peroxide[J]. China Plastics, 2020, 34(10): 1-5.

图/表 6

PE?HD∶POE∶BIPB	凝胶含量/%
90∶10∶0	0
90∶10∶0.1	0.1
90∶10∶0.2	0.2
90∶10∶0.3	27.3

表1 交联PE?HD/POE的凝胶含量

Tab.1 Gel content of cross?linked PE?HD/POE

图1 交联PE?HD/POE的复数黏度曲线

Fig.1 Complex viscosity curves of cross?linked PE?HD/POE

图2 交联PE?HD/POE的熔融曲线和结晶曲线

Fig.2 DSC curves of cross?linked PE?HD/POE in heating and cooling

PE?HD∶POE∶BIPB	T_mp/℃	T_co/℃	T_cp/℃	X_c/%
90∶10∶0	132.1	121.7	120.6	65.6
90∶10∶0.1	131.4	120.3	119.0	58.8
90∶10∶0.2	130.1	119.1	117.7	55.9
90∶10∶0.3	129.4	117.8	116.1	50.0

表2 交联PE?HD/POE的熔融和结晶特征值

Tab.2 Melting and crystallization characteristics of cross?linked PE?HD/POE

图3 交联PE?HD/POE的缺口冲击强度、断裂伸长率和拉伸屈服强度

Fig.3 Notched impact strength, elongation at break and tensile yield strength of cross?linked PE?HD/POE

图4 不同BIPB添加量的交联PE?HD/POE的冲击断面SEM照片(×5 000)

Fig.4 SEM microscopy of cross?sections of cross?linked PE?HD/POE with different BIPB contents(×5 000)

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过氧化物交联增韧改性PE⁃HD/POE共混物

Toughening Modification of PE⁃HD/POE Blends by Crosslinking with Peroxide

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