Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (10): 1110-1116.DOI: 10.11944/j.issn.1000-0518.2017.10.170231

• Orginal Article • Previous Articles     Next Articles

Effect of Polyols on the Morphology and Properties of 1,4-Phenylene Diisocyanate-Based Microcellular Polyurethane Elastomers

HUAN Yanab,LI Xiaoxiaoab,TIAN Yumengad,WANG Jiec*(),YANG Xiaoniuac*()   

  1. aPolymer Composites Engineering Laboratory,Changchun Institute of Applied Chemistry Chinese Academy of Sciences,Changchun 130022,China
    bUniversity of Chinese Academy of Sciences,Beijing 100049,China
    cState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry Chinese Academy of Sciences,Changchun 130022,China
    dUniversity of Science and Technology of China,Hefei 230026,China
  • Received:2017-06-27 Accepted:2017-07-20 Published:2017-09-29 Online:2017-09-29
  • Contact: WANG Jie,YANG Xiaoniu
  • Supported by:
    Supported by the Jilin Province Key Scientific and Technological Projects(No.20160204031GX)

Abstract:

Microcellular polyurethane elastomers were obtained by a two-step polymerization using 1,4-phenylene diisocyanate(PPDI), 1,4-butanediol(BDO), water, polyethylene tetrahydrofuran ether polyol(PTMEG) and hydrogenated hydroxyl-terminated butadiene polyols(HLBH) as raw materials. Fourier reflection infrared(FTIR-ATR), dynamic mechanical analysis(DMA), differential scanning calorimetry(DSC), universal material testing machine, dynamic fatigue testing machine were used to systematically characterize the microphase separation, low temperature resistance, dynamic heat build-up of the samples. The results show that the microcellular size of the specimens based on two polyols is 100~300 μm wherein the 150 μm is the majority, indicating that the structure of polyols has little influence on the microcellular size. Due to more H-bonds between hard segments, HLBH-based microcellular polyurethane elastomers show better microphase separation than that of PTMEG. There is a wide modulus platform region at -30~150 ℃ in the modulus-temperature curve for HLBH-based specimens due to its proper microphase separation structure. However, due to the crystallization of the soft segments at low temperature, the modulus of PTMEG-based specimens increases dramatically under 0 ℃. The stiffness of HLBH-based specimens surpasses that of PTMEG-based specimens at low temperature, and the hysteresis heat production of HLBH-based specimens is less than that of PTMEG-based specimens. Therefore, the former shows better dynamic fatigue performance.

Key words: polyurethane material, microcellular polyurethane elastomer, microphase separation, low temperature, phenylene diisocyanate