Solid phase
- Official name
- FULL solid
- Secondary names
- polyethylene; polyethene; poly(methylene); PE
- CAS number
- 9002-88-4
- Family
- molecular solid
- Class
- non polar molecular solid
- Compound type
- homopolymer
- Comments
- The polymer has up to 7 500 000 monomers units and different branching degrees. It is classified according to its density and branching: very-low-density polyethylene (VLDPE), low-density polyethylene (LDPE), Linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), Cross-linked polyethylene (PEX or XLPE), High-density cross-linked polyethylene (HDXLPE), high-density polyethylene (HDPE), Ultra-low-molecular-weight polyethylene (ULMWPE or PE-WAX), High-molecular-weight polyethylene (HMWPE), and ultra-high-molecular-weight polyethylene (UHMWPE)
- Terminal function
- $CH_3$
- Monomer number
- n, up to 7500000
- Molar mass
- 28.053 per mer unit $g/mol$
- Polymolecularity index
- 1
- Crystallinity degree
- 0.55
- Comments
- no well crytallized
- Formula
- $CH_3-(CH_2-CH_2)_n-CH_3$
- Chemical formula
- (CH3)2(C2H4)n
- Elemental formula
- (2H)10-404 (H)14-604 (Vo)10-500
- Isotope mixture type
- partly substituted
108.0
- Composition comments
- The formula is n repeting units + 2 $-CH_3$ terminal functions
- Oxides
-
Formula $Sm_{2}O_{3}$ $Co_{3}O_{4}$ $F$ Mass fraction (%) 25.0 35.0 40.0 - Oxides comments
- très oxydé
- Class
- molecular solids with apolar molecules (01)
- Type
- with polyatomic organic apolar molecules (CnHm...) (01.06)
- Group
- H2O polymorphs (03.01.01)
- Code
- 04.01.01.05’
- Endmembers
- Polymorphs
-
- TEST solid (fake polymorph)
- VOID solid (fake void polymorp)
- Equivalent liquid
- FULL Liquid water
- Equivalent mineral
- FULL Mineral
- Phase name
- Full
- Phase type
- various
- Crystal system
- N/A
- Crystal class
- ditetragonal-dipyramidal
- Crystal class symbol
- -43m (Td)
- Crystal spacegroup
- P4(2)/nnm
- Polytypes
-
- Very-low-density polyethylene (VLDPE) (VLDPE is defined by a density range of 0.880–0.915 g/cm3. VLDPE is a substantially linear polymer with high levels of short-chain branches.)
- Low-density polyethylene (LDPE) (LDPE is defined by a density range of 0.910–0.940 g/cm3. LDPE has a high degree of short- and long-chain branching.)
- Crystal sites
-
Label Type Nb Wp Species Species coordinence Species occupancy Species oxidation state M1 split interstitial 2 1e222 $^2H$ or $D$ tetrahedral IV 0.75 2 $H$ bicapped hexagonal antiprismatic XIV 0.25 2 O4 interstitial 3 1e222 $^2H$ or $D$ trigonal prismatic VI 0.48 3 $H$ trigonal bipyramidal V 0.0 0 - Crystal molecule sites
-
Label Type Nb Species Species coordinence Species occupancy Species order cage 5-12_6-4 split interstitial 2 L-$(COOH)CH_2CHOH(COOH)$ pentagonal dodecahedron XX 0.25 fixed position R-$(COOH)_2CHOSF2$ hexagonal truncated trapezohedron XXIV 0.75 orientationaly disordered cage 5-12_6-8 topological defect 6 L-$(COOH)CH_2CHOH(COOH)$ hexadecahedron XXVIII 0.33 unknown R-$(COOH)_2CHOSF2$ trigonal prismatic square face bicapped VIII 0.66 rotating - Composition order
- partly ordered
- Comments
- crystal comments
- Molar mass
- 28.053 $g/mol$
- Density
- 0.87 - 0.97 $g/cm^3$
- State NTP
- solid
- Phase transitions
-
Phase transition type Other phases Temperature - Pressure solid-liquid decomposition glass polyethylene ~160-200 K (~ -70°C - -110°C) triple point solid-solid-liquid amorphous Water ice Ia ~160-200 K (~ -110°C - -180°C) - Phase transitions comments
- above the glass transition melting occurs at 45-144°C
- Refringence type
- biaxial
- Refringence sign
- positive or negative
- Birefringence
- 1 - 2.5
- Refraction index $n_{\alpha}$
- 1.475 - 1.54
- Refraction index $n_{\beta}$
- 1.475 - 1.54
- Refraction index $n_{\gamma}$
- 1.475 - 1.54
- Dispersion V
- strong
- Pure color
- colorless, white
- Color
- various
- Diaphaneity
- transparent to opaque
- Luster
- vitreous