Dioctyl Adipate DOA

DOA is a common synthetic ester plasticizer used in various oil-resistant compounds to improve low-temperature properties. The commercial volumes of DOA consumed by the rubber industry are much smaller than those for DOR 

being an ester, is formed from the reaction of an alcohol with an organic acid 

Feedstock dependency is based on 2-ethylhexanol and adipic acid. 

ASTM D1992 can be used to classify adipate plasticizers. 

Zhejiang Jiaao Chemical (China) Zhe Jiang Chemical (China) Ashland Chemical Nova Specialty Chemicals 

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Often dioctyl phthalate (DOP). Also dioctyl adipate (DOA). 

Synonyms BEHA DEHA dioctyl adipate DOA hexanedioic acid, dioctyl ester octyl adipate... 

Dioctyl azelate (trade name - Emolein) Dioctyl adipate (DOA) Bring down viscosity of HTPB and consequently, increase solids loading which improve performance of propellants and PBXs. 

Dioctyl Adipate (DOA) or Bis(2-octyi)-Qdipate. Same as Di- 2-ethylhexyl)-adipate, described earlier in this Vol, without giving US Specification requirements and tests. This compd has been used in polyisobutylene binders intended for expl and pro pint compns. One of the rocket proplnts. Unit No 547, using DOA is described in conf Propellant Manual SP1A/M2 (1969)... 

Dioctyl adipate (DOA) 5 D1236—D1237, D1398—D1400... 

Other 2-ethylhexanol based plasticizers were introduced, including some which imparted outstanding low temperature flexibility—dioctyl adipate (DOA), dioctyl azelate (DOZ), dioctyl sebacate (DOS), and trioctyl phosphate (TOF). In addition, TOF showed high resistance to microorganisms which was important in military applications. Furthermore, TOF improved flame resistance. However, the mixed ester—octyl diphenyl phosphate—also introduced in the forties—was far superior and showed a better balance of low temperature performance and flame resistance than either TOF or the well-established plasticizer—tricresyl phosphate (TCP). Each of these found a market as a specialty plasticizer because of these specific performance attributes. None, however, was a serious threat to DOP on an overall price-performance basis. Rather, they were used to supplement the properties of DOP where its performance was inadequate. 

SYNS ADIPOL2EH BEHA BIS(2-ETHYL-HEXYL) ADIPATE BISOFLEX DOA DEHA DI-2-ETHYLHEXYL ADIPATE DIOCTYL ADIPATE DOA... 

The bulk of aliphatic ester plasticizers are derived from adipic, sebacic and azelaic acid esterified with linear or branched monofunctional alcohols of short to medium-chain length, for example, dioctyl adipate (DOA, di[2-ethylhexyl]adipate), diiso-nonyl adipate (DINA), di[n-butyl]sebacate (DBS). Adipate, azelate and sebacate plasticizers are distinguished by their low viscosity, thus making them particularly attractive to the plastisol sector, and giving excellent low-temperature flexibility properties. 

Samples of PBUU and SPU-10 were swollen to equilibrium in solvents of different polarity dioctyl sebacate (DOS), dioctyl adipate (DOA), dihexyl phthalate (DHP), transformer oil (TM), nitrile of oleic acid (NOA), dibutyl carbitol formal (DBCF), and tributyl phosphate (TBP). 

Considering existing reference data, such as the glass transition temperatures of SPU samples and plasticizers, and the experimental results on an equilibrium swelling, Q, of initial (non-plasticized) SPU samples, the following compounds have been taken as SPU plasticizers TBP, tricresyl phosphate, TCP, dibutylcaibitolformal, DBCF, DOP, and dioctyl adipate, DOA. 

Rgure 7 Separation of dioctyl phalate (DOP) and dioctyl adipate (DOA) plasticizers in exhaust gases from an industrial plant. Separon SGX silica gel column, 5pm, 150x3mm ID mobile phase 0.3% 2-propanol in n-hexane (v/v), 1 mlmin h temperature 40°C. Sample volume 20 pi, UV detection at 230 nm. 

Di(2-ethylhexyl) adipate (dioctyl adipate, DOA) n. A primary plasticizer for vinyls, cellulose nitrate, polystyrene, and ethyl cellulose. In vinyls, DOA is often used in combination with phthalate and other plasticizers, imparting good resilience, low-temperature flexibility, and resistance to extraction by water. It is FDA-approved for use in vinyl food-packaging films. 

Alcohols of similar chain length to those used in phthalate manufacture can be esterified with adipic acid rather than phthalic anhydride to produce the family of adipate plasticizers. For example, esterification of 2-ethylhexanol with adipic acid yields di-2-ethylhexyl adipate (DEHA), also known as dioctyl adipate (DOA). 

All ammonium ISEs are based on the macrotetrolide antibiotics and their major applications relate to enzyme studies. PVC membranes with nonactin (18) (containing up to 28% monactin 19) have been fabricated with a wide range of solvents, namely diethyl-, dibutyl- and dioctyl phthalates dioctyl adipate dibutyl-, dioctyl- and diethylhexyl sebacates diethylhexyl- and tripentyl phosphates di-octylphenyl phosphonate and 2-nitrophenyl phenyl ether (49,50). In terms of selectivity, dioctyl adipate (DOA) was the best solvent, and the nonactin sensor could be conserved by fixing the mass ratios of nonactin DOA PVC at 1 300 160. The Nerntian slope was 57.5mV decade and kRH4,K = 0 H (50). 

The low temperature flexibility of NBR can be improved by the addition of dioctyl adipate (DOA) or dioctyl sebacate (DOS) type plasticizers. 

Plasticizers based upon aliphatic dicarboxyhc acids are also used, mainly where low temperature flexibility of PVC is required such as in some film and plastic wrap applications. One common plasticizer in this class is dioctyl adipate (DOA). 

Lastly, adipic acid is directly used to produce dioctyl adipate (DOA) plasticizer for imparting better low-temperature properties to rubber compounds. 

An efficient low temperature plasticizer for PVC and its copolymers and the more polar synthetic rubbers. Bisoflex 120 is an economical replacement for dloctyl azelate (DOZ) and dioctyl sabacate (DOS). These low temperature plasticizers, based on natural product-derived acids are frequently used for applications where dioctyl adipate (DOA) is considered too volatile. The plasticizing, processing and volatility characteristics of Bisoflex 120 are very similar to those of OOZ. 

To improve low temperature flexibility, nitrile rubbers are often blended with NR, SBR, and polybutadiene or blended with lower ACN content nitrile rubbers. Dioctyl adipate (DOA) is used for good compatibility between NBR and PVC. Carbon blacks are used for improving reinforcements, better compression set, and aging. Silica particles are used for improving reinforcement, abrasion resistance, and tear resistance. Clays are added into NBR compoimd for better processability, tear resistance, and physical properties as well as cost reduction of the compounds. Calcium carbonates are used for better processability and cost reduction... 

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