NR twb tsis muaj tseeb melting point, maj mam softening, hauv 130 ¡æ ~ 140 ¡æ kiag li softened, kub ~ 150 ℃ ℃ viscosity khov heev kua nruab nrog cev, 200 ¡æ pib zom, 270 tauj c pib zom. Sov, elastic, NR kub decreases maj hardens, li tsis li 0 ° c yooj ywm qaub heev rau 70 ℃ hauv qab qhov nkig. Tej roj hmab frozen yog ncu rhaub kom sov yuav restore elasticity
1 elastic
NR ntawm elastic modulus txog li 3 ~ 6MPa, elongated 1000 tauj % tsis muaj txhaum.
2 hardness
NR Crystal hauv lwm nro crystalline, muaj zog qhov-complementary; NR loj molecular luj, kub ua tau txhua yam. Cov pos hniav ntshiab si vulcanizate puas zog rau 16.7 ~ 28.4MPa, dub cov siv tam li 24.5 ~ 34.3MPa tom qab. NR deformation ntau thiab uas tsis muaj cua sov ntawm cov hluas, cov zoo kuj mus Flex qaug zog.
hnub nyoog 3
Ntawm ob bonds, qho yooj yim uas nqus tau cov pa, NR ultraviolet lub teeb yuav lwj, thiab cracking.
4 tawm
NR tsis muaj ncov qaumteb qabteb pawg, cov-ncov qaumteb qabteb roj hmab, xwb tej ncov qaumteb qabteb kuab tshuaj. Insoluble ethyl acetate, ethanol thiab acetone. Nyob rau hauv cov-ncov qaumteb qabteb kuab tshuaj xws li roj av, benzene o o lawm. Kuab kuj roj kuj tsis, alkaline kuj zoo, tiamsis tsi muaj concentrated muaj kua qaub tiv taus.
5 zauv
NR sab luj molecular tis, nrog rau cov ua zoo zog. Zoo dispersibility thiab solubility NR thiab compounding. Machined, muaj tsim plasticity thiab viscosity, qhov yooj yim calender rau cov menyuam.
6NR tau zoo breathability, dej kuj, kuj txias thiab rwb thaiv tsev hluav taws xob. Yooj yav tom ntej thiab kam rau ua.
