In other words the synthesis of prepolymers.

The result is 25.5%. The average equivalent weight of the prepolymer is 171.7.
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The prepolymer crystallises slowly at room temperature.

Ibrahim Sendijarevic, Anthony J. McHugh, Josh A. Orlick, Jeffrey S. Moore, “The Role of Alkyl End Groups on the Miscibility of Hyperbranched Polymers with Polyolefins”, Polym. Eng. Sci; 2002.

The preferred chain extender in polyester formulations is butane diol.
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A typical polyester polyol formulation would consist of

Polyurethanes obtained from aromatic isocyantes and low molecular weight diols have a high glass transition temperature and are rather brittle, whereas PURs obtained from aliphatic isocyantes and diols have much lower glass transition temperatures (Tg's) and are more flexible. The majority of commercial PURs are elastomers. They can be made without crosslinking (vulcanizing) the polymer chains. The highly elastic network consists of alternating flexible polyether/polyester blocks and rather short and hard (aromatic) urethane blocks. The urethane blocks associate to hard domains that are connected via hydrogen bonds. These domains act as physical crosslinks and provide a restorative force when the thermoplastic urethane elastomer is stretched.

TPI offers a wide range of services to support innovations in polyurethanes:
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Sendijarevic, V., Sendijarevic, I., Heric, S., and Leova, V., “Recycling of Scrap Flexible Foams Based on Soy Polyols into Rebond Foams,” CPI Polyurethanes Technical Conference 2009, National Harbor, MD (Washington, D.C.), October 5-7, 2009.

Best paper award, The CPI Polyurethanes Conference 2010, Houston, Texas, 2010.
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Troy Polymers, Inc. | Polyurethane Innovation is our Business

InfiChem Polymers was presented Detroit Free Press Michigan Green Leaders Award in Small Business category presented in April 2012 for its proprietary technology developed in collaboration with Troy Polymers, Inc. that converts polyurethane scrap destined for landfills into the InfiGreen™ line of polyol products that are used in production on new polyurethanes. These awards are presented annually by the Detroit Free Press to recognize businesses, people, and organizations that are doing outstanding work to move Michigan forward toward a green and sustainable economy.

Synthesis of Linear Polyether Polyol Derivatives As …

InfiChem Polymers and Magna Seating received a Chrysler’s Environmental Achievement Award in September 2010 for the implementation of close loop recycling process that entails production of seat cushions for Jeep Grand Cherokee from InfiChem’s polyols produced from scrap urethane cushions using a technology developed in collaboration with Troy Polymers, Inc.

Synthesis of polyether polyols with epoxidized soy …

Author of 20 technical papers and 3 US patents. He holds a Ph.D. in Chemical Engineering from University of Illinois, Urbana-Champaign and a B.S.E. degree in Chemical Engineering from The University of Michigan, Ann-Arbor. His Ph.D. thesis work focused on the study of structure-property relationships of highly branched dendritic polymers determining the effects of the degree of branching and end-groups functionality on the inter-molecular and intra-molecular interactions of dendritic molecules. He explored the properties of dendritic molecules in blends with linear polymers and in application of dendritic polymers as processing additives and surface modifiers. As an associate engineer at Merck & Co he worked on the scale-up of organic chemistry processes for production of Active Pharmaceutical Ingredients. In this effort he worked on the scale-up efforts of dozens of chemical steps and amongst other achievements was responsible for the development of a novel impurity rejection method and the development of a novel crystallization process.
At Troy Polymers Inc., he works on the commercialization of the in-house technologies and on the business development of the company. He is also contributing to the development of TPI’s scale-up and processing laboratories. He is a frequent reviewer for Journal of American Chemical Science.

21/12/2017 · Synthesis of polyether polyols with ..

Mohd Azmil Mohd Noor, Vahid Sendijarevic, Hazimah Abu Hassan, Ibrahim Sendijarevic, Tuan Noor Maznee Tuan Ismail, Hoong Seng Soi, Nurul ‘Ain Hanzah, and Razmah Ghazali, “Polyether polyols as GPC calibration standards for determination of molecular weight distribution of polyether polyols”, J. Appl. Polym. Sci. 2015, DOI: 10.1002/APP.42698