The effect of polyamide PA12 and polyester PBT blocks' lengths on the structure and propertries of multiblock terpoly(amide-block-ester-block-amide) (TPAEA)

Abstract

Streszczenie-Otrzymano trójsk³adnikowy uk³ad multiblokowy terpoli(amido-blok-estro-blok-amid) (TPAEA) o nastêpuj¹cej budowie chemicznej: poli[(oligoamid 6.36)-blok-(tereftalan tetrametylenu)-blok-(laurynolaktam)] o symbolu-(PA6.36-b-PBT-b-PA12) n-, w którym trzeci sk³adnik o odpowiednim ciê¿arze cz¹steczkowym (w tym przypadku jest to blok PBT) rozpuszcza siê w fazie bloków PA12 (twardej) i czêoeciowo rozpuszcza siê w fazie bloków PA6.36 (miêkkiej). Zbadano wp³yw wymiarów bloków PA12 i PBT na w³aoeciwooeci TPAEA. Metodami DSC, DMTA i WAXS oceniono jakooeciowo strukturê i rozdzia³ fazowy takich uk³adów. Stwierdzono, ¿e sk³ad terpolimerów i udzia³ poszczególnych bloków determinuje wiele cech TPAEA, a przede wszystkim decyduje o ich w³aoeciwooeciach wysokoelastycznych typowych dla termoplastycznych elastomerów. Udowodniono, ¿e wprowadzony do uk³adu dwusk³adnikowego (kopolimeru multiblokowego) trzeci sk³adnik-PBT, w okreoelonych warunkach stabilizuje strukturê jako kompatybilizator na granicy domena-matryca. S³owa kluczowe: terpoli(amido-b-estro-b-amid), elastomer termoplastyczny, budowa chemiczna, przemiany fazowe, wzajemna mieszalnooeae bloków, dynamiczne w³aoeciwooeci mechaniczne. THE EFFECT OF POLYAMIDE PA12 AND POLYESTER PBT BLOCKS' LENGTHS ON THE STRUCTURE AND PROPERTIES OF MULTIBLOCK TERPOLY(AMIDE-BLOCK-ESTER-BLOCK-AMIDE) (TPAEA) Summary-The ternary multiblock system terpoly(amide-b-ester-b-amide) (TPAEA) of the chemical structure: poly[(oligoamide-6.36)-block-(tetramethylene terephthalate)-block-laurolactam)]-(PA6.36-b-PBT-b-PA12) n-has been obtained (Table 1). In this system the third component (PBT block here), characterized with the proper molecular weight, is dissolved in hard phase of PA12 blocks and partially dissolved in soft phase of PA6.36. The effects of PA12 and PBT blocks' lengths on TPAEA properties were investigated. The structure and phase separation were qualitatively estimated on the basis of DSC, DMTA and WAXS results (Fig. 1-3). It was found that the composition of terpolymer and parts of the blocks determines many TPAEA features and first of all determines its high flexible properties, typical for thermoplastic elastomers (Table 2). It has been proved that PBT as a third component introduced into binary system (multiblock copolymer) in some conditions stabilized the structure acting as a compatibilizer at the domain-matrix border.

Synthesis and nonisothermal crystallization kinetics of thermoplastic polyamide‐6 elastomers

“…Among all of them, of particular interest are TPAEs, due to their strong hydrogen bond strength between polymer chains resulting in their good balance between processability and performance . The soft segments are usually composed of aliphatic polyols, polyethers, or polyesters, and the hard segments are generally constructed by polyamide‐12, polyamide‐6, or polyamide‐1010 with good tensile strength and resistance to abrasion and chemicals, respectively . However, it is worthy to point out that current complex synthesis routes have limited development of TPAEs in industry for large‐scale production.…”

“…11 The soft segments are usually composed of aliphatic polyols, polyethers, or polyesters, and the hard segments are generally constructed by polyamide-12, polyamide-6, or polyamide-1010 with good tensile strength and resistance to abrasion and chemicals, respectively. [12][13][14][15][16] However, it is worthy to point out that current complex synthesis routes have limited development of TPAEs in industry for large-scale production. To address this issue, few papers have reported to utilize one-pot polymerization synthetic route strategy to prepare TPAEs via caprolactam (CPL) hydrolytic ring-opening polymerization.…”

Synthesis and characteristics of thermoplastic elastomer based on polyamide‐6

“…Thermoplastic elastomers prepared from polyamide (TPAE) are a new member of the TPE family and have received much attention in recent years due to their favourable balance between processability and performance. TPAEs are generally block copolymers consisting of soft blocks (based on one or more aliphatic polyols, polyolefins, polyethers or polyesters) with low glass transition temperature ( T g ) and hard blocks (based mainly on aliphatic polyamides such as polyamide‐12, polyamide‐4,6 and polyamide‐10,10, or aromatic polyamides from aliphatic diacid and diisocyanate) with high melting temperature ( T m ) 11–15. As one of the most important members of the polyamide family, the easily obtained polyamide‐6 (PA6) has had limited use as a hard segment for TPAEs, and little information on synthesis routes to TPAE via caprolactam hydrolytic ring‐opening polymerization can be found in the literature 16–18.…”

The Study of Thermolplastic Elastomer Based on Polyamide 6: Preparation, Morphology and Mechanical Performance

“…Thermoplastic elastomers prepared from polyamide (TPAEs) [1][2][3][4][5] are a new member of the thermolplastic elastormers (TPEs) family, and have received much attention in recent years due to their favorable balance between processability and performance. TPAEs are generally block copolymers consisting of soft blocks (based on one or more aliphatic polyols, polyolefins, polyethers or polyesters) with low glass transition temperature (T g ), and hard blocks (based mainly on aliphatic polyamides such as polyamide-12, polyamide-4,6 and polyamide-10,10, or aromatic polyamides from aliphatic diacid and diisocyanate) with high melting temperature (T m ) or Tg [5][6][7][8][9]. As one of the most important members of the polyamide family, the easily obtained polyamide-6 (PA6) has had limited use as a hard segment for TPAEs, and little information on synthesis routes to TPAE via caprolactam hydrolytic ring-opening polymerization can be found in the literature [1,4,10].…”