INDUSTRY COMPONENT

Siloxane Backbone

The siloxane backbone is the repeating Si-O-Si chain that forms the core structure of silicone resins, providing flexibility and thermal stability.

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Component Specifications

Definition
The siloxane backbone consists of alternating silicon and oxygen atoms (Si-O-Si) with organic side groups attached to silicon. This inorganic-organic hybrid structure imparts unique properties such as high thermal stability, low surface tension, and resistance to oxidation and UV radiation. In silicone resins, the backbone length and crosslinking density determine mechanical strength and hardness.
Working Principle
The siloxane backbone is synthesized via hydrolysis and condensation of organosilicon monomers (e.g., dimethyldichlorosilane). The Si-O bond has high bond energy (452 kJ/mol), providing thermal stability. Flexibility arises from the low rotational barrier around the Si-O bond. Crosslinking occurs through residual silanol groups or functional side chains, forming a three-dimensional network.
Materials
Polydimethylsiloxane (PDMS) with controlled molecular weight; vinyl or phenyl groups for crosslinking; purity >99%.
Technical Parameters
  • Density 0.97-1.02 g/cm³
  • Viscosity 100-10,000 cP at 25°C
  • Molecular Weight 10,000-100,000 g/mol
  • Thermal Decomposition Temperature >350°C
Standards
ISO 14526, DIN 16946

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Siloxane Backbone.

siloxane backbone silicone resin Si-O-Si chain thermal stability flexibility organosilicon Siloxane Backbone in Chemical Manufacturing

Parent Products

This component is used in the following industrial products

Silicone Resin

A synthetic polymer derived from silicon, oxygen, and organic groups, known for its thermal stability, electrical insulation, and weather resistance.

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Engineering Analysis

Risks & Mitigation
  • Hydrolysis sensitivity in acidic conditions
  • Potential for cyclic siloxane formation during synthesis
FMEA Triads
Trigger: Incomplete condensation
Failure: Reduced crosslinking density leading to soft resin
Mitigation: Optimize reaction time and catalyst concentration
Trigger: Contamination with water
Failure: Premature gelation
Mitigation: Use anhydrous conditions and dry raw materials

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for molecular weight distribution
Test Method
Gel Permeation Chromatography (GPC) per ASTM D5296

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the siloxane backbone?

It is the repeating Si-O-Si chain that forms the core of silicone resins, providing flexibility and thermal stability.

How does the siloxane backbone affect silicone resin properties?

It imparts high thermal stability, low surface tension, and resistance to oxidation and UV radiation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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