• Title/Summary/Keyword: 열적성질

Search Result 414, Processing Time 0.035 seconds

Syntheses, Solubilities and Thermal Properties of Polyamide-imides containing Bis(p-carbonylphenyl)diphenylsilane units (Bis(p-carbonylphenyl)diphenylsilane 단위를 함유한 폴리아미드-이미드의 합성과 용해도 및 열적성질에 관한 연구)

  • Un Sik Kim;Young Kiel Sung;Yoon Koo Sik
    • Journal of the Korean Chemical Society
    • /
    • v.31 no.6
    • /
    • pp.590-600
    • /
    • 1987
  • Silicone-containing polyamide-imides were prepared from bis(p-chlorocarbonylphenyl)diphenylsilane (BCCDPS), pyromellitic dianhydride(PMDA) and diamines. The thermal characteristics of the above polymers had been carefully studied using a thermogravimetric analyzer. The thermal stability of polymer was decreased with increasing contents of bis(p-carbonylphenyl)diphenylsilane units(BCDPS). The effect of diamine on thermal stability of polymer led benzidine > m-phenylenediamine> 4,4'-diaminodiphenyl ether > 4,4'-diaminodiphenyl sulfone. The activation energy of degradation of polymer obtained by Friedman method increased as the contents of BCDPS in the polymer decreased. The degradation temperature of polymers generally increased as the activation energy increased. The solubility of polymer increased as the content of BCDPS increased except polymers prepared with benzidine.

  • PDF

PBS-PTMG Segmented Block Copolymer의 Segment와 Domain 배향 거동

  • 박해동;이한섭;조창기;박영효
    • Proceedings of the Korean Fiber Society Conference
    • /
    • 1998.04a
    • /
    • pp.76-79
    • /
    • 1998
  • 일반적인 합성 섬유들은 비생분해성 고분자로 환경문제의 원인이므로 이를 대체하기 위하여 생분해성 지방족 폴리에스터가 널리 연구되고 있다.[1] 그러나, 이들의 기계적, 열적 성질이 다른 합성 섬유에 비해 떨어진다. 따라서, 생분해성 고분자의 특성을 유지하면서 기계적 성질을 향상시키기 위하여 다른 유연한 고분자와 지방족 폴리에스터를 공중합하였다.(중략)

  • PDF

기능성 열유체의 열에너지 수송성

  • 박기원
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
    • /
    • v.30 no.8
    • /
    • pp.45-53
    • /
    • 2001
  • 열적 성질을 가지는 각종 용질을 물을 주체로 한 열매체 등에 혼합 분산시킴으로써 그 열매체인 유체의 성질을 바꾸어 다원적 기능성을 가지도록 한 기능성 열유체의 열에너지 수송성에 대해 살펴보고자 한다.

  • PDF

Poly(vinyl alcohol) Nanocomposite Films (II): Thermo-mechanical Properties and Morphology (폴리(비닐 알코올) 나노복합체 필름(II) : 열적-기계적 성질 및 모폴로지)

  • Ham, Shin-Kyun;Jung, Min-Hye;Chang, Jin-Hae
    • Polymer(Korea)
    • /
    • v.30 no.6
    • /
    • pp.545-549
    • /
    • 2006
  • Blends of poly(acrylic acid- co-maleic acid) (PAM) with poly (vinyl alcohol) (PVA) were pre -pared in distilled water PVA/PAM/saponite (PVA/PAM/SPT) nanocomposite films were prepared with various clay contents by using the solution intercalation method. The variations of the dispersion, morphology, and thermo-mechanical properties of the nanocomposites with clay content in the range 0 to 9 wt% were examined. Up to 3 wt% clay loading, the clay particles were homogeneously dispersed in the PVA/PAM blends. However, some agglomerated structures form in the polymer matrix above a clay content of 7 wt%. The thermal stability of the hybrids was increased linearly with increasing the clay loading up to 9 wt%. The maximum strength and modulus were obtained at a clay content of 7 wt%. Thus, the addition of small amounts of clay to the PVA/PAM blends produced PVA/PAM nano-composites with improved the thermo-mechanical properties.