Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method

Guang-Zhi Jin; Le-Hang Chen; Yu-Zhen Gong; Peng Li; Run-Guo Wang; Fan-Zhu Li; Yong-Lai Lu

doi:10.1007/s10118-025-3250-9

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Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method

RESEARCH ARTICLE | Updated：2025-01-23

- Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method
- Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method
- 高分子科学（英文） 2025年43卷第2期页码：303-315
- Affiliations：
  
  a.State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
  b.Engineering Research Center of Elastomer Materials Energy Conservation and Resources, Ministry of Education, Beijing 100029, China
  c.Key Laboratory of Carbon Fiber and Functional polymers, Beijing University of Chemical Technology, Beijing 100029, China
  d.Center of Advanced Elastomer Materials, College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  wangrg@mail.buct.edu.cn (R.G.W.)
  lifz@mail.buct.edu.cn (F.Z.L.)
  luyonglai@mail.buct.edu.cn (Y.L.L.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 52473228).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-025-3250-9.
- DOI：10.1007/s10118-025-3250-9
  中图分类号： M
- 纸质出版日期：2025-02-01，
  
  网络出版日期：2025-01-18，
  
  收稿日期：2024-09-12，
  
  修回日期：2024-10-11，
  
  录用日期：2024-10-15
- Accepted：
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Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method[J]. 高分子科学（英文）, 2025,43(2):303-315.

GUANG-ZHI JIN, LE-HANG CHEN, YU-ZHEN GONG, et al. Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method. [J]. Chinese journal of polymer science, 2025, 43(2): 303-315.
Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method[J]. 高分子科学（英文）, 2025,43(2):303-315. DOI： 10.1007/s10118-025-3250-9.

GUANG-ZHI JIN, LE-HANG CHEN, YU-ZHEN GONG, et al. Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method. [J]. Chinese journal of polymer science, 2025, 43(2): 303-315. DOI： 10.1007/s10118-025-3250-9.

摘要

The PPDI-CPU exhibits a more regular microstructure with larger

denser spherulites

which enhances stress distribution and inhibits crack propagation

resulting in superior fatigue performance. In contrast

the NDI-CPU shows sparser spherulite distribution

while TDI-CPU lacks a distinct spherulitic structure.

Abstract

The fatigue resistance of casting polyurethane (CPU) is crucial in various sectors

such as construction

healthcare

and the automotive industry. Despite its importance

no studies have reported on the fatigue threshold of CPU. This study employed an advanced Intrinsic Strength Analyzer (ISA) to evaluate the fatigue threshold of CPUs

systematically exploring the effects of three types of isocyanates (PPDI

NDI

TDI) that contribute to hard segment structures based on the cutting method. Employing multiple advanced characte

rization techniques (XRD

TEM

DSC

AFM)

the results indicate that PPDI-based polyurethane exhibits the highest fatigue threshold (182.89 J/m

) due to a highest phase separation and a densely packed spherulitic structure

although the hydrogen bonding degree is the lowest (48.3%). Conversely

NDI-based polyurethane

despite having the high hydrogen bonding degree (53.6%)

exhibits moderate fatigue performance (122.52 J/m

)

likely due to a more scattered microstructure. TDI-based polyurethane

with the highest hydrogen bonding degree (59.1%) but absence of spherulitic structure

shows the lowest fatigue threshold (46.43 J/m

). Compared to common rubbers (NR

NBR

EPDM

BR)

the superior fatigue performance of CPU is attributed to its well-organized microstructure

polyurethane possesses a higher fatigue threshold due to its high phase separation degree and orderly and dense spherulitic structure which enhances energy dissipation and reduces crack propagation.

关键词

Keywords

Casting polyurethaneFatigue thresholdCutting methodHard segment structuresMaterials characterization

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