Journal
EUROPEAN POLYMER JOURNAL
Volume 174, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2022.111303
Keywords
Copolymerization; Suppress crystallization; Ultra-low temperature elasticity
Categories
Funding
- National Natural Science Foundation of China [51873203]
- Key Projects of Jilin Province Science and Technology Development Plan [20200401041GX, 20200401042GX]
- Talent Development Grants Centralized Funding Project of Jilin Province [Y9390002]
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In this study, we explored the ultra-low temperature elasticity of polydimethylsiloxane (PDMS) modified with flexible alkyl branches. The results showed that the flexible alkyl branches not only suppressed crystallization but also enhanced cross-linking activity, resulting in improved ultra-low temperature elasticity of PDMS. This research has important implications for the development of ultra-low temperature applications.
Elastomers that services under ultra-low temperature environments are of great strategic and technological importance. Among them, polysiloxanes are excellent precursors, however, the unfavorable crystallization greatly limits its ultra-low temperature application. Herein, we explore the synthesis, glass transition temperature (Tg), cross-linking behavior and long-time ultra-low temperature elasticity characterization of polydimethylsiloxane (PDMS) with flexible alkyl branches. The results demonstrated that the flexible alkyl branches play a dual role in PDMS, for it can not only unlock its ultra-low temperature elasticity by suppressing crystallization, but also provide more free radical attack sites to enhance the cross-linking activity. The resulting elastomer with a Tg lower than -120 degrees C exhibits excellent elasticity at such a low temperature down to -110 degrees C. Moreover, the facile and efficient one-step thiol-ene addition post-polymerization enables the large-scale preparation of this ultra-low temperature elastomer. The work demonstrated here reveals a general practical strategy to unlock PDMS ultra-low temperature performance, which is conducive to the development of cutting-edge scientific research.
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