Ultrasonic plasticizing micro-injection molding of UHMWPE based on new process flow and ultrasonic system structure to improve mechanical properties and process stability.

Zhiying Shan, Xingbo Qin, Hang Li, Yanghui Xiang, Wangqing Wu

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Article in Ultrasonics sonochemistry, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 authors.

Zhiying ShanState Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China. Electronic address: zhiying_shan@163.com.

Xingbo QinState Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China. Electronic address: qinxingbo2022@163.com.

Hang LiState Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China. Electronic address: 233712189@csu.edu.cn.

Yanghui XiangSchool of Mechanical and Electrical Engineering, Changsha University, Changsha 410022, China. Electronic address: xiangyanghui@163.com.

Wangqing WuState Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China. Electronic address: csuwwq@csu.edu.cn.

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6 · The paper itself

Abstract

Ultrasonic plasticizing micro-injection molding (UPMIM) technology has been considered as an effective means of UHMWPE molding. However, the cumbersome forming process, the degradation of mechanical properties and the poor consistency of molding and property seriously restrict further application. In this study, a new ultrasonic molding method of UHMWPE micro-parts is proposed. Firstly, the UHMWPE ultrasonic plasticizing material was prepared simply and quickly by ultrasonic technology. Secondly, the UHMWPE tensile samples were molded by an innovative UPMIM structure with a large diameter ratio of the ultrasonic sonotrode to plasticizing cavity. Then, the optimum molding process parameters were obtained by grey relational analysis (GRA). After that, the influence of system stability and process parameters on mechanical properties and consistency was studied by contribution analysis. Finally, compared with the typical UHMWPE molding method (compression molding) and the existing research results, the influence and feasibility of the process are analyzed in detail. The results show that the ultrasonic technique can effectively prepare UHMWPE tablets with almost unchanged properties (molecular weight decreased by 0.31 %). A large diameter ratio of the ultrasonic sonotrode to plasticizing cavity can expand the process window for complete filling of UHMWPE tensile samples, and the filling stability of the ultrasonic system is increased by about 1.8 times. Meanwhile, this ultrasonic system structure can also inhibit the oxidative degradation of UHMWPE, reduce the break of molecular chain. The elongation at break (EB) of tensile samples increased from 5.56 % to 12.2 %, while the tensile strength (TS) decreases from 136.54 % to 68.11 %. Moreover, the contribution of process parameters to the mechanical properties and consistency for UHMWPE tensile samples is 55.97 %-88.37 %, while the contribution of ultrasonic system stability is 11.63 %-44.03 %.

Indexed as

Mechanical propertyUHMWPEUltrasonic degradationUltrasonic plasticizing micro-injection moldingUltrasonic system stability

Identifiers

PMID39954362

DOI10.1016/j.ultsonch.2025.107272

PMCPMC11872510

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