This study mainly aims to investigate the role of grafted semifluorinated acrylic compound in the crucial characteristic properties of high density polyethylene (HDPE). Graft copolymerization of the semifluorinated acrylic compound, 3,3,4,4,5,5,6,6,7,7,8,8,8-dodecafluoro-5-methyloctyl-4-(acryloyloxy) benzoate (ABCF13) onto HDPE within the different content levels of ABCF13 (5, 10, 15, 20, 30 and 40%) was performed by bulk-melt polymerization method. The changes in the thermal, microstructural and free volume characteristics of graft coproducts with extent of grafting were investigated in detail by means of DSC, powder X-ray diffraction and PALS techniques, respectively. The experimental findings showed that the melting temperature of crystalline domains and crystallinity ofHDPE reached the maxima at the 15% and 40% ABCF13 contents, respectively. The grafting of ABCF13 onto HDPE also gave rise to significant expansion and contraction in lateral dimensions of orthorhombic unit cell parameters in the crystalline domains of HDPE. Moreover, PALS analyses depicted that the size of the free volumes increased almost linearly with the grafting percentage. As for mechanical behaviours of the graft products, remarkable improvements were achieved in especially tensile strength (from 18.75 MPa to 43.75 MPa) and impact strength (from 19.30 Mpa to 38.72 MPa). The morphological properties of the fractured surfaces obtained from tensile and impact tests of products were also examined by SEM analysis. The samples possessed completely homogeneous structure without any phase separation. A gradual transition from ductile behaviour to brittle nature was observed as the grafting level increased in the products.

这项研究的主要目的是研究接枝的半氟化丙烯酸化合物在高密度聚乙烯（HDPE）的关键特性中的作用。将半氟化丙烯酸化合物3,3,4,4,5,5,6,6,7,7,8,8,8-十二氟-5-甲基辛基-4-（丙烯酰氧基）苯甲酸酯（ABCF13）接枝共聚通过本体熔融聚合法在ABCF13的不同含量水平（5、10、15、20、30和40％）内进行HDPE。分别通过DSC，粉末X射线衍射和PALS技术详细研究了接枝副产物的热，微观结构和自由体积特性随接枝程度的变化。实验结果表明，HDPE的晶畴熔化温度和结晶度分别在15％和40％ABCF13含量达到最大值。ABCF13接枝到HDPE上也导致HDPE晶域中正交晶胞参数横向尺寸的显着膨胀和收缩。此外，PALS分析表明，自由体积的大小几乎随接枝百分比呈线性增加。至于接枝产品的机械性能，尤其是在抗张强度（从18.75 MPa至43.75 MPa）和冲击强度（从19.30 Mpa至38.72 MPa）方面取得了显着改善。还通过SEM分析检查了通过产品的拉伸和冲击测试获得的断裂表面的形态学性质。样品具有完全均匀的结构，没有任何相分离。随着产品中接枝水平的提高，观察到了从韧性到脆性的逐渐过渡。