In the process of the continuous development of organic silicon materials towards high-performance and functionalization, the design of molecular topological structure has become a core element for regulating the rheological behavior and curing network performance of the materials. The product we have launched, vinyl-terminated Q-type structure polydimethylsiloxane 22714, as a branched active intermediate with four vinyl-terminated polydimethylsiloxane chains in its molecule, demonstrates significant industrial application value in high-end application fields such as improving the fluidity of thermal interface materials, optimizing the processing performance of organic silicon composites, and regulating the mechanical properties of addition-cured silicone rubbers.


I. Core Structural Characteristics and Physical Properties


The vinyl-terminated Q-type structure polydimethylsiloxane 22714 of our product is a colorless to light yellow transparent liquid with a relative molecular weight range of 4,000 to 12,000 daltons, a polydispersity index less than 1.80, and a viscosity of 20 to 50 millipascal-seconds at 25 degrees Celsius, with a free chlorine ion content of less than 50 ppm. The core structural innovation of this product lies in its Q-type branched molecular framework. In the organic silicon chemical nomenclature, the Q unit represents a four-functional silicon-oxygen unit, i.e., SiO4/2 structure, which can serve as a branching node to connect multiple polydimethylsiloxane chains. The product contains four vinyl-terminated polydimethylsiloxane chains, which are radially distributed around the Q unit. The polydispersity index less than 1.80 indicates a relatively concentrated molecular weight distribution and good batch consistency.


II. Core Performance Advantages and Application Mechanism


The vinyl-terminated Q-type structure polydimethylsiloxane 22714 of our product demonstrates the following core performance advantages in material processing and application:


Highly efficient reactivity and compatibility. The end vinyl in the molecule can undergo efficient silane hydrogen addition reaction with components containing silicon-hydrogen bonds under the action of a platinum catalyst, forming a crosslinking network. At the same time, it has good compatibility with various polysiloxanes containing vinyl functional groups, which can be uniformly dispersed in various organic silicon systems, ensuring the uniformity of the curing reaction and the consistency of the final product performance.


Unique viscosity reduction and flow improvement function. The Q-type branched structure gives it a unique advantage in reducing the viscosity of the system. While maintaining high reactivity, it can effectively reduce the viscosity of organic silicon composites during processing or the viscosity of the organic silicon product itself, facilitating the improvement of the fluidity of thermal interface materials. In thermal interface materials, good fluidity enables the material to better fill the microscopic gaps between the heat-generating element and the heat sink, reducing the interface thermal resistance and improving the heat dissipation efficiency.


Flexible mechanical property regulation capability. By adjusting the addition amount of this product, the hardness, modulus, and elongation at break of the organic silicon material can be finely regulated. The branched Q-type structure introduces branch points in the curing network, helping to enhance the tear resistance and elastic recovery ability of the vulcanized rubber.


III. Main Application Areas


The vinyl-terminated Q-type structure polydimethylsiloxane 22714 of our product, with its unique Q-type branched structure and high reactivity, can play a key role in the following high-end application areas:


1. Flow regulation and performance optimization of thermal interface materials (TIM). This product is a key active component in the formulation of thermal interface materials such as thermal pads and thermal gels. Its excellent viscosity reduction effect can increase the filler filling volume, while improving the rheological behavior of the material, ensuring that it can fully fill the microscopic gaps between the heat-generating element and the heat sink during the application process.


2. Performance regulation of addition-cured silicone rubber. In the formulations of room-temperature curing liquid silicone rubber and high-temperature curing silicone rubber, this product can be used as an active diluent or a crosslinking density regulator, effectively reducing the viscosity of the rubber compound without sacrificing the mechanical strength of the final product. By adjusting its dosage, precise control can be achieved over the hardness, modulus, and elongation at break of the vulcanized rubber.


III. Processing aids and functional modifiers for organic silicone composites. During the processing of filled organic silicone composites (such as thermal, conductive, or flame-retardant silicone rubbers), this product can effectively reduce the viscosity of the system and improve the uniformity of filler dispersion.


IV. Packaging specifications and storage conditions


Product vinyl-terminated Q-type structural polydimethylsiloxane 22714 is available in one-kilogram, five-kilogram, twenty-five-kilogram, and two-hundred-kilogram inner-coated iron drum packaging and ton barrel packaging, sealed with nitrogen. It should be stored in a cool and dry place, avoiding contact with strong oxidants, acids, and alkalis, and keeping away from heat sources. The shelf life is three months. Beyond this period, it can be retested according to standards, and if qualified, it can still be used.


V. Quality Assurance and Market Value


Product vinyl-terminated Q-type structural polydimethylsiloxane 22714 has established a strict quality control system during production. Key indicators such as product appearance, relative molecular weight, polydispersity index, viscosity, and free chlorine ion content are monitored throughout the process to ensure consistency and reliability between batches.


With the continuous growth in the demand for efficient thermal management materials in industries such as 5G communication, high-performance computing, and new energy vehicles, the demand for special organic silicone intermediates with branching structure's viscosity-reducing effect and high reactivity is expanding. Product vinyl-terminated Q-type structural polydimethylsiloxane 22714, with its unique Q-type branching molecular configuration, precise end-vinyl functionalization design, and flexible performance control capabilities, is becoming an important raw material option for the development of thermal interface materials and the performance optimization of organic silicone composites, providing strong raw material support for promoting technological innovation and industrial upgrading of high-end organic silicon materials.