Nea ɛnte sɛ thermoplastics no, wɔtaa de elastomers di dwuma wɔ ɔhyew ahorow pii so na ɛboro wɔn ahwehwɛ nsakrae ɔhyew (TG) so kɛse. Mfasoɔ a ɛwɔ elastomers so wɔ thermoplastics so ne sɛ ɛkame ayɛ sɛ ɛtumi san nya ahoɔden koraa firi tensile tebea (high elasticity), ne wɔn generalized elasticity, low hardness ne modulus ahoɔden a ɛba fam. Sɛ wɔde elastomers di dwuma wɔ dan mu hyew ase a, ɛda adi sɛ ɛyɛ den, modulus kɔ soro, na ɛma ɛyɛ mmerɛw sɛ ɛbɛkɔ soro. Sɛ wɔde elastomers di dwuma wɔ dan mu hyew ase a, su bi wɔ hɔ sɛ den no bɛkɔ soro, modulus no akɔ soro, elasticity akɔ fam (ɛba fam tensile) na wɔahyɛ no den ma akɔ soro. Ɛgyina ɔhaw a ɛwɔ elastomer no so no, nneɛma mmienu tumi si wɔ bere koro mu - ahwehwɛ a ɛyɛ den ne partial crystallization - CR, EPDM, NR yɛ elastomers ho nhwɛsoɔ bi a ɛda crystallization adi.
1. Ɔhyew a ɛba fam ho sɔhwɛ ho nsɛm a wɔaka abom .
Wɔde brittleness, compression daa deformation, retraction, hardening ne cryogenic hardening adi dwuma mfe pii sɛnea ɛbɛyɛ a wɔbɛkyerɛ polymer su ahorow wɔ ɔhyew a ɛba fam mu. Compressive stress relaxation yɛ ade foforo koraa na ɛtwe adwene si sɛnea wobehu tumi a ade bi de siw ano wɔ bere tenten bi mu wɔ tebea horow a atwa yɛn ho ahyia mu.
2. brittleness hyew .
ASTM D 2137 kyerɛ brittleness temperature ase sɛ ɔhyew a ɛba fam koraa a vulcanized rɔba renkyerɛ sɛ abubu anaasɛ ɛpaapae wɔ tebea pɔtee bi mu. Wɔsiesie rɔba nhwɛsoɔ anum a ɛwɔ nsɛsoɔ a wɔadi kan ahyɛ no agyiraeɛ, wɔde ahyɛ dan anaa nsuo mu, wɔde ahyɛ ɔhyew a wɔahyɛ mu ma 3±0.5min, na afei wɔama no ahoɔhare a ɛyɛ 2.0±0.2m/s. Woyi nhwɛsode ahorow no fi hɔ na wɔde hyɛ impact anaa rupture sɔhwɛ mu. Woyi nhwɛsode no fi hɔ na wɔsɔ hwɛ sɛ ebia ɛbɛbɔ anaasɛ ɛbɛpaapae anaa, ne nyinaa nsɛe. Wɔsan yɛɛ sɔhwɛ no kɔɔ brittleness temperature so - ɔhyew a ɛba fam koraa a wɔanhu sɛ abubu biara no bɛn 1°C yiye.
3. Ɔhyew a ɛba fam a wɔde mia ne ɔhyew a ɛba fam a ɛyɛ den .
Sɔhwɛ kwan a wɔfa so yɛ low-temperature compression set no bɛn nea ɛfa standard compression set ho no yiye, gye sɛ ɔhyew no nam ahoɔden kwan bi so, te sɛ ice a ɛyɛ dry, liquid nitrogen, anaa mfiri akwan na ɛhwɛ so, na bo no wɔ ± 1°C a ɛwɔ preset temperature no mu. Bere a wɔasan anya afi fixture no mu akyi no, wɔde nhwɛsode no nso si ɔhyew a ɛba fam a wɔahyɛ ato hɔ no so na wɔanwene no ma ne kɛse yɛ 29 mm na ne kɛse yɛ 12.5 mm. Low-temperature compression set yɛ ɔkwan a ɛnteɛ a wɔfa so hyɛ aduru a wɔreka ho asɛm no mu ma. Compressive stress relaxation ne ɔkwan a wɔfa so yɛ no tẽẽ na wɔbɛka ho asɛm akyiri yi. Wɔtaa de vulcanised compression set specimen (29mm x 12.5mm) nso na ɛkyerɛ ɔhyew a ɛba fam, nanso wɔsan sɔ hwɛ wɔ ɔhyew a ɛba fam sohwɛ mu, a ɛne nea wɔde yɛ nhyɛso no yɛ pɛ, na afei ɛsan wɔ ɔhyew koro no ara a wɔde yɛ wɔn hyew no mu. Hardening ne low-temperature compression set no nya onwini so nkɛntɛnso tẽẽ, nanso ɛsan nso nya su a polymer no wɔ sɛ ɛbɛyɛ crystallize no, a crystallization rate gyina ɔhyew so, s.e., Cr crystallizes fastest around -10°C, na afei ɛso tew wɔ ɔhyew a ɛba fam, titiriw esiane immobility a ɛwɔ polymer nkɔnsɔnkɔnsɔn afã horow no mu (Molecular Chains Freeze).
4. Gehman ɔhyew a ɛba fam a ɛyɛ den .
ASTM D 1053 kyerɛkyerɛ ɔkwan a wɔfa so yɛ den a ɛba fam no mu sɛnea edidi so yi: wɔde polymer nhwɛsode a ɛyɛ den a ɛtoatoa so abata waya bi a ɛwɔ torsional constant a wonim ho, na wɔde waya no ano foforo abata torsion ti a ebetumi ama kwan ma wɔakyinkyim nhama no ho. Wɔde nhwɛsode ahorow no hyɛ ɔhyew a ɛkɔ baabi foforo mu wɔ ɔhyew pɔtee bi a ɛba fam sen sɛnea ɛte daa mu, na saa bere no na torsion ti no twitwiw 180°, na afei wɔde dodow bi (a ennu 180°) twitwiw nhwɛsode no a egyina nhwɛsode no a ɛne no hyia ne sɛnea ɛyɛ mmerɛw no so. Afei fa goniometer dodow no kyerɛ sɛnea nhwɛsode no twist dodow, twist no anim ne rɔba ade no yɛ den. Wɔde nkakrankakra ma nhyehyɛe no hyew kɔ soro wɔ saa bere yi mu, na wonya twist no anim a ɛne ɔhyew hyia no ho mfonini. Wɔtaa kyerɛw ɔhyew a modulus no du T2, T10, ne T100 no sɛ ɛne modulus bo a ɛwɔ dan mu hyew mu no yɛ pɛ.
5. Ɔhyew a ɛba fam a ɛtwetwe (TR sɔhwɛ) .
Wɔde TR sɔhwɛ no di dwuma de hwɛ tumi a nhwɛsode bi wɔ wɔ tensile tebea mu bere a wɔde compressive daa deformation ne compressive stress relaxation a wɔde compressive stress kyerɛ no di dwuma de kyerɛ ɔhyew a ɛba fam nkɛntɛnso. Sɛnea yɛadi kan aka ho asɛm no, polymers pii te sɛ NR ne PVC bɛyɛ ahwehwɛ wɔ ɔhyew a ɛba fam mu, nanso sɛ wɔtrɛw mu nso a, ebetumi ayɛ ahwehwɛ, na ɛde nneɛma foforo aba bere a wɔhwɛ ɔhyew a ɛba fam no. Wɔ evaluation applications te sɛ exhaust suspension ho no, TR a ɛwɔ nhyɛso ase no fata yiye na wɔtaa de di dwuma. Wɔ saa sɔhwɛ yi mu no, nhwɛsodeɛ no tenten (ɛtaa yɛ 50% anaa 100%) na ɛyɛ nwini wɔ tebea a ɛware mu. Wɔgyae nhwɛsodeɛ no, saa berɛ no na wɔma ɔhyeɛ no kɔ soro wɔ dodoɔ a wɔahyɛ no den mu de susu nhwɛsoɔ no a ɛsan ba no ho, wɔsusu ntwitwiridii no tenten na wɔkyerɛw ntrɛmu no. Ɔhyew a nhwɛsode no so tew 10%, 30%, 50%, ne 70% no taa yɛ TR10, TR30, TR50, ne TR70. TR10 fa ɔhyew a ɛyɛ brittleness no ho; TR70 fa nhwɛsode no a ɛbɛsɛe no daa wɔ ɔhyew a ɛba fam a wɔde hyɛ mu no ho; na nsonsonoe a ɛda TR10 ne TR70 ntam no yɛ nea wɔde susuw nhwɛsode no mu ahwehwɛ (dodow a nsonsonoe no yɛ kɛse no, dodow no ara na su a ɛwɔ hɔ sɛ ɛbɛyɛ ahwehwɛ no yɛ kɛse).
6 . Ɔhyew a ɛba fam a ɛma obi nya nhyɛso a ɛma obi ho dwo no (CSR) .
Wobetumi de CSR sɔhwɛ no adi dwuma de ahyɛ nkɔmhyɛ ahorow a ɛfa sɛnea nneɛma a wɔde hyɛ mu no yɛ adwuma ne ne nkwa ho. Sɛ wɔma elastomeric aduru bi deformation a ɛkɔ so daa a, wɔbɔ tumi a wɔaka abom, na tumi a ade no tumi kura saa tumi yi mu wɔ nneɛma a atwa yɛn ho ahyia pɔtee bi mu no susuw tumi a ɛwɔ sɛ ɛbɛsɔ ano no ho. Nneɛma a ɛwɔ nipadua ne nnuru mu nyinaa boa ma adwennwen ho dwo, a egyina bere ne ɔhyew so, ade biako bedi tumi, wohu honam fam ahomegye wɔ ɔhyew a ɛba fam mu, wɔ adwennwen bi akyi pɛɛ, a ɛde nkɔnsɔnkɔnsɔn foforo ba ne nsakrae a ɛba wɔ rɔba-filler ne filler-filler no ani, na adwennwen a woyi fi hɔ no yɛ nea wotumi san dannan. Wɔ ɔhyew a ɛkɔ soro mu no, nnuru a ɛwɔ mu no na ɛkyerɛ sɛnea ahomegye no te, bere a nneɛma a ɛkɔ so wɔ nipadua no mu no sua dedaw na nnuru a ɛma ahomegye no yɛ nea wontumi nsakra no, na ɛde nkɔnsɔnkɔnsɔn a ɛpaapae ne nneyɛe a ɛne ne ho hyia no ba. Ɔhyew a ɛkɔ soro anaa ɔhyew a ɛkɔ soro mpofirim no betumi anya nkɛntɛnso wɔ adwennwen a ɛma obi ho dwo no so wɔ elastomers mu. Wɔ CSR sɔhwɛ no mu no, wɔde sɔhwɛ nhwɛsode no si hɔ .
Wɔ CSR sɔhwɛ mu no, adwennwen a ɛma obi ho dwo no kɔ soro bere a wɔde sɔhwɛ nhwɛsode no hyɛ ɔhyew a ɛkɔ soro ase no. Sɛ adwennwen a ɛma obi ho dwo no ba ntɛm wɔ sɔhwɛ no mu a, ahomegye foforo dodow no kɔ soro kan na ne bo yɛ den sen biara wɔ kyinhyia a edi kan no mu. Wɔ tensile sɔhwɛ kɛse bi mu a ɛbɛma wɔayɛ gasket nhwɛsode (19mm akyi ntwemu, ne mu ntwemu yɛ 15mm), a ɛwɔ elastic fixture no bɛ comprew akɔ specimen no so akɔ wɔn dan mu hyew kɛse a ɛyɛ 25%, na wɔ 25 °C mu wɔ nneɛma a atwa yɛn ho ahyia sɔhwɛ dan no mu, ɔhyew no wɔ 25 °C ma ɛkɔ so yɛ 24h, na afei wɔankɔ so atra ase -20 ~ 110 °C cycle a ɛyɛ 24h, sɔhwɛ bere no nyinaa wɔ sɔhwɛ hyew, sɔhwɛ hyew, ahoɔden a ɛkɔ so gyinaesi. Wɔyɛ ahoɔden susudua no daa wɔ sɔhwɛ bere no nyinaa mu wɔ sɔhwɛ hyew no mu.
7. Ethylene a ɛwɔ mu no nkɛntɛnso .
7.1 Ethylene a ɛwɔ mu no na ɛwɔ nkɛntɛnso kɛse wɔ EPDM polymers no hyew a ɛba fam no so. Wɔhwehwɛɛ polymers a ethylene a ɛwɔ mu no fi 48% kosi 72% wɔ sealing formulations a ɛkorɔn ase. Ne nyinaa botae ne sɛ ɛbɛtew nsakrae a ɛwɔ Mooney nsu a ɛyɛ den mu no so denam ENB a wɔde bɛba saa polymer ahorow yi mu no so.
EPDM rɔba yɛ amorphous sɛ ethylene/propylene ratio yɛ pɛ na monomers mmienu a ɛwɔ polymer chain no mu no nkyekyɛmu yɛ random a. EPDM a ɛwɔ 48% ne 54% ethylene a ɛwɔ mu no nnɔ sɛ ɛyɛ kristal wɔ dan mu hyew anaa nea ɛboro saa. Sɛ ethylene a ɛwɔ mu no du 65% a, ethylene ntoatoasoɔ no firi aseɛ kɔ soro wɔ dodoɔ ne ne tenten mu na ɛtumi yɛ ahwehwɛ, a wɔhunu wɔ crystallization peaks a ɛwɔ DSC curves no so bɛyɛ 40°C. Dodow a DSC no yɛ kɛse no, dodow no ara na ahwehwɛ a ɛyɛ kɛse no yɛ kɛse.
7.2 Nea ɛka nkɛntɛnso a ethylene a ɛwɔ mu no nya wɔ ɔhyew a ɛba fam a wɔka ho asɛm akyiri yi no so no, ahwehwɛ kɛse no ka sɛnea ɛyɛ mmerɛw sɛ wɔbɛfrafra nneɛma a ɛwɔ ahwehwɛ mu no mu na wɔayɛ ho adwuma. Dodow a crystallite kɛse no yɛ kɛse no, dodow no ara na ɔhyew ne shear adwuma pii ho hia wɔ afrafra fã no mu na ama polymer no ne nneɛma afoforo no afra koraa. EPDM nnuru a wɔde yɛ rɔba ahoɔden a wɔmfa nhyehyɛ mu no kɔ soro bere a ethylene a ɛwɔ mu no kɔ soro no. Wɔ sealing formulations mu a wɔsusuu ethylene a ɛwɔ mu no nkɛntɛnsoɔ no, ethylene a ɛwɔ mu no kɔɔ soro firi 50% kɔsii 68% no maa anyɛ yie koraa no, rɔba no ahoɔden kɔɔ soro mpɛn anan. Room-temperature hardness nso kɔ soro bere a ethylene a ɛwɔ mu no kɔ soro no. Mpoano Amorphous polymer adhesive no yɛ den yɛ 63°, bere a mpoano a ɛyɛ den a ɛwɔ polymer a ethylene a ɛdɔɔso wom no yɛ 79°. Eyi fi ethylene ntoatoaso no a ɛkɔ soro, ahwehwɛ a ɛkɔ soro wɔ ade a wɔde nkata so no mu, ne nkɔanim a ɛne no hyia wɔ ɔhyew a ɛwɔ ɔhyew mu no mu.
7.3 Sɛ wɔsusu sɛnea ɛyɛ den no wɔ ɔhyew a ɛba fam mu a, nea ɛne polymers a ethylene a ɛwɔ mu no dɔɔso bɔ abira no, amorphous polymers no kyerɛ sɛ nsakrae a ɛba wɔ den no mu no sua, bere a nsakrae a ɛba wɔ hardness a ɛwɔ ethylene a ɛkɔ soro no mu no nkyerɛ sɛ ɛyɛ linear na ɛyɛ den no kɔ so yɛ kɛse wɔ dan mu hyew mu, ma enti polymers a ethylene a ɛwɔ mu no kɔ so yɛ den kɛse wɔ ɔhyew a ɛkorɔn no mu.
7.4 Compression set no gyina test temperature so kɛse. Sɛ wɔsɔ hwɛ wɔ 175°C a, nsonsonoe biara nni nhyɛso a wɔde asi polymers no mu biara ntam (wɔde aduru no nhyehyɛe ne vulcanization nhyehyɛe a wɔpaw no so nkɛntɛnso na ɛba). Bere a ethylene ahwehwɛ no ayɛ hyew akyi no, polymer no da ɔkwan a ɛnyɛ nea ɛyɛ nwene adi, na sɛnea ɛbɛyɛ a wɔbɛhwehwɛ nkɛntɛnso a ethylene a ɛwom no nya no mu no, wɔyɛɛ sɔhwɛ ahorow wɔ 23°C. Polymers a ethylene a ɛwɔ mu no dɔɔso no da adi pefee sɛ ɛwɔ daa deformation (ɛboro mmɔho abien), na ethylene a ɛwɔ mu no nkɛntɛnso yɛ kɛse mpo bere a wɔsɔ hwɛ wɔ -20°C ne -40°C no. Polymers a ethylene a ɛwɔ mu bɛboro 60% no wɔ daa deformation (>80%); Wɔ -40°C no, polymers a ɛnyɛ nea ɛyɛ pɛpɛɛpɛ no nkutoo na ɛwɔ deformation a ɛtra hɔ daa a ɛba fam (17%).
7.5 Ethylene a ɛwɔ mu no nkɛntɛnso wɔ ɔhyew a ɛba fam a ɛyɛ den so fi Gehman sɔhwɛ ahorow mu. Sɛ wɔde ɔhyew bi ma a, dodow a ntwea no kɔ soro no, dodow no ara na stiffness (anaasɛ modulus a ɛkɔ soro) no kɔ fam. Wɔ ɔhyew a ɛba fam mu no, stiffness modulus no kɔ soro kɛse bere a ethylene a ɛwɔ mu no kɔ soro no. Wɔ amorphous polymers ho no, T2 yɛ -47°C, bere a ethylene a ɛwɔ mu a ɛkorɔn sen biara no wɔ T2 a ɛyɛ -16°C pɛ.
7.6tr susudua shrinkage recovery of specimens Wɔ extension freezing akyi no, ethylene a ɛwɔ mu no nya nkɛntɛnso kɛse wɔ sɔhwɛ kwan no so, a ɛsan di nsɛ te sɛ Gehman sɔhwɛ no.
Eyi te sɛ Gehman sɔhwɛ no. Nneɛma a ɛma polymer ahorow no twetwe (%) no gu ahorow sɛnea ɔhyew no yɛ adwuma, na amorphous polymers no wɔ shrinkage recovery a ɛkorɔn sen biara wɔ ɔhyew a ɛba fam mu; Nanso, sɛnea wɔhyɛɛ ho nkɔm no, nea ɛsan ba no sɛe bere a ethylene a ɛwɔ mu no kɔ soro wɔ ɔhyew bi a wɔde ama mu no.
Nneɛma a ɛma obi ho tɔ no no sɛe. TR10 bo no gu ahorow fi -53°C ma amorphous polymers kosi -28°C ma polymers a ethylene a ɛdɔɔso wom.
7.7 Nhyɛso a ɛma obi nya ahoɔden a ɛma obi ho dwo no (CSR) kyinhyia .
Kanko. Mia aduru no, ma wɔn ho ndwo wɔ 25°C h 24, na afei fa gu ɔhyew a efi -20°C kosi 110°C bere ne bere mu 24 h. Sɛ wɔhyɛ no nea edi kan a, wɔ bere a ɛkari pɛ no akyi no, crystalline polymer E no wɔ nhyɛso a ɛyera kɛse sen amorphous polymer no, na sɛ wɔde si fam kɔ -20°C a, tumi a ɛwɔ polymer abien no mu no so tew, bere a amorphous polymer A no wɔ nhyɛso a ɛkɔ soro (f/F0 a ɛkɔ soro). Ɔhyew no maa aduru no yɛɛ hyew koduu 110°C no san de ne tumi a ɛhyɛ nsɔano no bae, na sɛ wɔsan de ba fam kodu -20°C a, na tumi a aka a ɛwɔ ahwehwɛ polymer no mu no nnu 20% wɔ ne bo mu, a mpɛn pii no wobu no sɛ ɛba fam dodo sɛ wɔde bedi dwuma dodow no ara, a amorphous polymer no kura ne tumi a ɛma nsɔano no boro 50%, na amorphous polymer no san nya ahoɔden a ɛboro ahwehwɛ no so sen polymer no. kyinhyia a edi hɔ no de nsɛm a ɛte saa ara bae. Ɛda adi pefee sɛ amorphous polymers korɔn ma sealing applications wɔ baabi a ɛho hia sɛ ɛyɛ adwuma yiye na ɛba fam wɔ ɔhyew mu.
8. Nkɛntɛnso a diolefin a ɛwɔ mu no nya .
Sɛnea ɛbɛyɛ a wobenya beae a ɛnyɛ den a ɛho hia ma vulcanization no, wɔde diolefin a ɛnyɛ nea wɔaka abom te sɛ ENB, HX ne DCPD ka ethylene propylene polymers ho. Bond biako biako yɛ adwuma wɔ polymer matrix no mu, bere a nea ɛto so abien no yɛ adwuma sɛ ade a ɛka polymerized molecular chain no ho na ɛma vulcanization point ma sulfur yellow vulcanization. Wɔhwehwɛɛ nkɛntɛnso a ENB nya wɔ mframa ahwehwɛ (nsu) bar profiles mu. Wɔde polymers a 2%, 6% ne 8% ENB wom no totoo ho.EnB a wɔde kaa ho no nyaa nkɛntɛnso kɛse wɔ vulcanization su ne crosslink density so. Modulus kɔɔ soro bere a elongation so tew kɛse. Hardness no kɔɔ soro na compression set no yɛɛ yiye bere a ɔhyew no kɔ soro no. Bere a ENB mu nsɛm no kɔ soro no, charring bere no yɛ tiaa.
ENB yɛ ade a ɛnyɛ nea ɛyɛ nwene, na sɛ wɔde ka polymer akyi dompe no ho a, ɛsɛe ethylene fã a ɛwɔ polymer no mu no, ma enti wobetumi anya polymers a ɛwɔ ethylene a ɛwɔ mu koro no ara, na ENB a ɛwɔ mu no ma ɔhyew a ɛba fam no tu mpɔn. Wɔ dan mu hyew mu no, ENB a ɛkɔ soro no ma compression set no tu mpɔn kakra esiane crosslink density a ɛkɔ anim nti. Nanso, wɔ ɔhyew a ɛba fam mu no, compression set a ɛwɔ polymers a ENB a ɛwɔ mu no dɔɔso no mu no ye kɛse sen polymers a ɛwɔ 2% ENB a ɛwɔ mu no. Nkɛntɛnso a ENB a ɛwɔ mu no nya wɔ brittleness temperature, temperature retraction, ne Gehman sɔhwɛ no so no ankyerɛ nsonsonoe titiriw biara wɔ brittleness temperature ntam wɔ polymers ntam wɔ ɔkwan a ɛkɔ akyiri so, ne Gehman sɔhwɛ ne TR sɔhwɛ no, polymer biara kyerɛɛ nkɔso wɔ low-temperature properties a ENB content a ɛkɔ soro no mu.
9. Nkɛntɛnso a Mooney nsu a ɛyɛ hyew nya wɔ ɔhyew a ɛba fam so .
Wonim yiye sɛ Mooney viscosity (molecular mass) nya nkɛntɛnso kɛse wɔ elastomers a ɛyɛ adwuma no suban so. Wɔ extrusion ne molding applications mu wɔ extrusion ne molding applications mu no, ɛho hia sɛ wopaw compound a ɛwɔ mooney viscosity value a ɛfata. Wɔde aduru koro no ara a wɔde yɛɛ nhwehwɛmu de hwehwɛɛ nkɛntɛnso a monomer a ɛto so abiɛsa, ENB, nya wɔ ɔhyew a ɛba fam so de hwehwɛ mooney viscosity mu, polymers a ɛwɔ mooney viscosities a ɛyɛ 30, 60, ne 80 no, wɔde totoo ho, na mooney viscosity a ɛwɔ nnuru no mu no kɔɔ soro bere a Mooney viscosity a wɔde dii dwuma no yɛɛ kɛse no. Tensile ahoɔden, modulus, ne raw rɔba ahoɔden kɔɔ soro bere a Mooney nsu a ɛyɛ den no kɔ soro no. Nsunsuanso a Mooney nsu a ɛyɛ den no nyae wɔ EPDM a ɛyɛ hyew a ɛba fam no so no nyɛ nea ɛho hia. Nanso, compression daa deformation wɔ dan mu hyew, -20°C ne -40°C kɔ soro bere a molecule dodow kɔ soro no. Nanso, nhyɛso a wɔde sii dan mu hyew so, -20°C ne -40°C ansesa kɛse bere a molecule dodow kɔɔ soro no, bere a nhyɛso a wɔde sii hɔ wɔ ɔhyew a ɛkɔ soro (175°C) no kyerɛɛ nsakrae bi wɔ EPDM adhesives no mu nsu a ɛkɔ soro no ho.
10. Nsɛm a wɔde wie .
Ethylene ne diolefin a ɛwɔ mu no wɔ nkɛntɛnso kɛse wɔ EPDM elastomers adwumayɛ so wɔ ɔhyew a ɛba fam mu, a polymers a ethylene a ɛwɔ mu no sua no yɛ adwuma yiye na polymers a diolefin a ɛwɔ mu no dɔɔso no tu mpɔn esiane ethylene fã a ɛwɔ polymer no mu a asɛe nti. Ɛsɛ sɛ wɔde polymers a ɛwɔ ethylene a ɛba fam di dwuma bere a ɔhyew a ɛba fam adwumayɛ yɛ anohyeto no.
