Polymer–Gel Composite Phase Change Materials: A Functional Polymer Composite Approach for Solar-Thermal Energy Storage in Building Facades

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nThis is an unedited manuscript accepted for publication and provided as an Article in Press for early access at the author’s request. The article will undergo copyediting, typesetting, and galley proof review before final publication. Please be aware that errors may be identified during production that could affect the content. All legal disclaimers of the journal apply.n

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Year : 2025 [if 2224 equals=””]11/10/2025 at 2:54 PM[/if 2224] | [if 1553 equals=””] Volume : 13 [else] Volume : 13[/if 1553] | [if 424 equals=”Regular Issue”]Issue : [/if 424][if 424 equals=”Special Issue”]Special Issue[/if 424] [if 424 equals=”Conference”][/if 424] 06 | Page : 36 51

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    M. Balaji, K. Dilip kumar, Kiran A. Dongre, Ajay Veludurthi, R. Sethuraman, Peyyala Pramod Kumar, Baddepudi Malathi, G. Nixon Samuel Vijayakumar, Zakir Hussain,

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  1. Associate Professor, Professor, Professor, Associate professor, Assistant Professor, Associate Professor, Assistant Professor, Professor, Assistant Professor, Department of Mechanical Engineering, V R Siddhartha School of Engineering, Siddhartha Academy of Higher Education (Deemed to be University), Vijayawada, Department of Mechanical Engineering, Lakireddy Bali Reddy College of Engineering, Mylavaram, Department of Electrical Engineering, Prof Ram Meghe College of Engineering and Management, Amravati, Department of Mechanical Engineering, SV College of Engineering, Tirupati, Department of Electrical and Electronics Engineering, Karpagam Academy of Higher Education, Coimbatore, Department of Mechanical Engineering, MLR Institute of Technology, Hyderabad, Department of Mechanical Engineering, Vidya Jyothi Institute of Technology, Hyderabad, Department of Physics, R. M. K. Engineering College, Kavaraipettai, Department of Chemical Technology, Loyola Academy, Secunderabad, Andhra Pradesh, Andhra Pradesh, Maharashtra, Andhra Pradesh, Tamil Nadu, Telangana, Telangana, Tamil Nadu, Telangana, India, India, India, India, India, India, India, India

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nThis study investigates polymer–composite phase change materials (PCMs) in the form of polymer–gel hybrids as multifunctional systems for solar–thermal energy storage in building façades. Paraffin- and PEG-based PCMs were embedded into polyurethane and acrylic gel matrices to create shape-stabilized polymer–composites with high PCM loading (70–80 wt%). Differential Scanning Calorimetry (DSC) confirmed distinct melting/freezing transitions at ~56°C (paraffin) and ~42°C (PEG), with enthalpy values of 120–150 J/g, closely matching theoretical predictions, thereby validating that the polymer–composite structure preserves latent heat without significant thermal losses. Thermal conductivity measurements demonstrated an enhancement from 0.37 W/m·K (bulk PCM) to 0.50 W/m·K (polymer–composite system), representing a ~35% improvement that is critical for rapid heat transfer in façade applications. Dynamic Mechanical Analysis revealed that the polymer–composites maintained a storage modulus (E′) above 450 MPa across the façade-relevant range (10–60°C), with damping factors below 0.15, confirming the mechanical resilience of the polymer–composite framework under repeated cycling. Leakage tests showed <1% mass loss after 20 thermal cycles, highlighting the efficiency of the crosslinked polymer–composite network acting as a three-dimensional molecular cage to immobilize PCMs and prevent seepage. Under solar-simulation at 800 W/m², façade panels integrated with the polymer–composite exhibited a reduction of peak surface temperatures by 7–9°C and stabilized core fluctuations within ±2°C, validating their effectiveness in thermal buffering. Durability evaluation over 1000 cycles demonstrated retention of ~90% latent heat capacity, 95% thermal conductivity, and 92% mechanical stiffness, confirming that the polymer–composite resists phase segregation, leakage, and mechanical fatigue far better than conventional PCM systems, which typically lose 20–40% capacity within 500 cycles. Collectively, these findings establish the polymer–composite approach as a durable, leakage-resistant, and thermally efficient solution for scalable facade integration, offering long-term stability, multifunctionality, and significant energy-saving potential in modern building systems.nn

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Keywords: Polymer–gel composite, phase change materials, functional polymer, solar-thermal energy storage, building facades

n[if 424 equals=”Regular Issue”][This article belongs to Journal of Polymer and Composites ]

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[/if 424][if 424 equals=”Special Issue”][This article belongs to Special Issue under section in Journal of Polymer and Composites (jopc)][/if 424][if 424 equals=”Conference”]This article belongs to Conference [/if 424]

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How to cite this article:
nM. Balaji, K. Dilip kumar, Kiran A. Dongre, Ajay Veludurthi, R. Sethuraman, Peyyala Pramod Kumar, Baddepudi Malathi, G. Nixon Samuel Vijayakumar, Zakir Hussain. [if 2584 equals=”][226 wpautop=0 striphtml=1][else]Polymer–Gel Composite Phase Change Materials: A Functional Polymer Composite Approach for Solar-Thermal Energy Storage in Building Facades[/if 2584]. Journal of Polymer and Composites. 13/09/2025; 13(06):36-51.

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How to cite this URL:
nM. Balaji, K. Dilip kumar, Kiran A. Dongre, Ajay Veludurthi, R. Sethuraman, Peyyala Pramod Kumar, Baddepudi Malathi, G. Nixon Samuel Vijayakumar, Zakir Hussain. [if 2584 equals=”][226 striphtml=1][else]Polymer–Gel Composite Phase Change Materials: A Functional Polymer Composite Approach for Solar-Thermal Energy Storage in Building Facades[/if 2584]. Journal of Polymer and Composites. 13/09/2025; 13(06):36-51. Available from: https://journals.stmjournals.com/jopc/article=13/09/2025/view=0

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[if 424 not_equal=””]Regular Issue[else]Published[/if 424] Subscription Original Research

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Journal of Polymer and Composites

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Volume 13
[if 424 equals=”Regular Issue”]Issue[/if 424][if 424 equals=”Special Issue”]Special Issue[/if 424] [if 424 equals=”Conference”][/if 424] 06
Received 04/09/2025
Accepted 08/09/2025
Published 13/09/2025
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Publication Time 9 Days

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